icuSources/i18n/unicode/uregex.h

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 2004-2013, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 *   file name:  uregex.h
   7 *   encoding:   US-ASCII
   8 *   indentation:4
   9 *
  10 *   created on: 2004mar09
  11 *   created by: Andy Heninger
  12 *
  13 *   ICU Regular Expressions, API for C
  14 */
  15
  16 /**
  17  * \file
  18  * \brief C API: Regular Expressions
  19  *
  20  * <p>This is a C wrapper around the C++ RegexPattern and RegexMatcher classes.</p>
  21  */
  22
  23 #ifndef UREGEX_H
  24 #define UREGEX_H
  25
  26 #include "unicode/utext.h"
  27 #include "unicode/utypes.h"
  28
  29 #if !UCONFIG_NO_REGULAR_EXPRESSIONS
  30
  31 #include "unicode/localpointer.h"
  32 #include "unicode/parseerr.h"
  33
  34 struct URegularExpression;
  35 /**
  36   * Structure representing a compiled regular expression, plus the results
  37   *    of a match operation.
  38   * @stable ICU 3.0
  39   */
  40 typedef struct URegularExpression URegularExpression;
  41
  42
  43 /**
  44  * Constants for Regular Expression Match Modes.
  45  * @stable ICU 2.4
  46  */
  47 typedef enum URegexpFlag{
  48
  49 #ifndef U_HIDE_DRAFT_API
  50     /** Forces normalization of pattern and strings.
  51     Not implemented yet, just a placeholder, hence draft.
  52     @draft ICU 2.4 */
  53     UREGEX_CANON_EQ         = 128,
  54 #endif /* U_HIDE_DRAFT_API */
  55     /**  Enable case insensitive matching.  @stable ICU 2.4 */
  56     UREGEX_CASE_INSENSITIVE = 2,
  57
  58     /**  Allow white space and comments within patterns  @stable ICU 2.4 */
  59     UREGEX_COMMENTS         = 4,
  60
  61     /**  If set, '.' matches line terminators,  otherwise '.' matching stops at line end.
  62       *  @stable ICU 2.4 */
  63     UREGEX_DOTALL           = 32,
  64
  65     /**  If set, treat the entire pattern as a literal string.
  66       *  Metacharacters or escape sequences in the input sequence will be given
  67       *  no special meaning.
  68       *
  69       *  The flag UREGEX_CASE_INSENSITIVE retains its impact
  70       *  on matching when used in conjunction with this flag.
  71       *  The other flags become superfluous.
  72       *
  73       * @stable ICU 4.0
  74       */
  75     UREGEX_LITERAL = 16,
  76
  77     /**   Control behavior of "$" and "^"
  78       *    If set, recognize line terminators within string,
  79       *    otherwise, match only at start and end of input string.
  80       *   @stable ICU 2.4 */
  81     UREGEX_MULTILINE        = 8,
  82
  83     /**   Unix-only line endings.
  84       *   When this mode is enabled, only \\u000a is recognized as a line ending
  85       *    in the behavior of ., ^, and $.
  86       *   @stable ICU 4.0
  87       */
  88     UREGEX_UNIX_LINES = 1,
  89
  90     /**  Unicode word boundaries.
  91       *     If set, \b uses the Unicode TR 29 definition of word boundaries.
  92       *     Warning: Unicode word boundaries are quite different from
  93       *     traditional regular expression word boundaries.  See
  94       *     http://unicode.org/reports/tr29/#Word_Boundaries
  95       *     @stable ICU 2.8
  96       */
  97     UREGEX_UWORD            = 256,
  98
  99      /**  Error on Unrecognized backslash escapes.
 100        *     If set, fail with an error on patterns that contain
 101        *     backslash-escaped ASCII letters without a known special
 102        *     meaning.  If this flag is not set, these
 103        *     escaped letters represent themselves.
 104        *     @stable ICU 4.0
 105        */
 106      UREGEX_ERROR_ON_UNKNOWN_ESCAPES = 512
 107
 108 }  URegexpFlag;
 109
 110 /**
 111   *  Open (compile) an ICU regular expression.  Compiles the regular expression in
 112   *  string form into an internal representation using the specified match mode flags.
 113   *  The resulting regular expression handle can then be used to perform various
 114   *   matching operations.
 115   *
 116   *
 117   * @param pattern        The Regular Expression pattern to be compiled.
 118   * @param patternLength  The length of the pattern, or -1 if the pattern is
 119   *                       NUL terminated.
 120   * @param flags          Flags that alter the default matching behavior for
 121   *                       the regular expression, UREGEX_CASE_INSENSITIVE, for
 122   *                       example.  For default behavior, set this parameter to zero.
 123   *                       See <code>enum URegexpFlag</code>.  All desired flags
 124   *                       are bitwise-ORed together.
 125   * @param pe             Receives the position (line and column numbers) of any syntax
 126   *                       error within the source regular expression string.  If this
 127   *                       information is not wanted, pass NULL for this parameter.
 128   * @param status         Receives error detected by this function.
 129   * @stable ICU 3.0
 130   *
 131   */
 132 U_STABLE URegularExpression * U_EXPORT2
 133 uregex_open( const  UChar          *pattern,
 134                     int32_t         patternLength,
 135                     uint32_t        flags,
 136                     UParseError    *pe,
 137                     UErrorCode     *status);
 138
 139 /**
 140   *  Open (compile) an ICU regular expression.  Compiles the regular expression in
 141   *  string form into an internal representation using the specified match mode flags.
 142   *  The resulting regular expression handle can then be used to perform various
 143   *   matching operations.
 144   *  <p>
 145   *  The contents of the pattern UText will be extracted and saved. Ownership of the
 146   *   UText struct itself remains with the caller. This is to match the behavior of
 147   *   uregex_open().
 148   *
 149   * @param pattern        The Regular Expression pattern to be compiled.
 150   * @param flags          Flags that alter the default matching behavior for
 151   *                       the regular expression, UREGEX_CASE_INSENSITIVE, for
 152   *                       example.  For default behavior, set this parameter to zero.
 153   *                       See <code>enum URegexpFlag</code>.  All desired flags
 154   *                       are bitwise-ORed together.
 155   * @param pe             Receives the position (line and column numbers) of any syntax
 156   *                       error within the source regular expression string.  If this
 157   *                       information is not wanted, pass NULL for this parameter.
 158   * @param status         Receives error detected by this function.
 159   *
 160   * @stable ICU 4.6
 161   */
 162 U_STABLE URegularExpression *  U_EXPORT2
 163 uregex_openUText(UText          *pattern,
 164                  uint32_t        flags,
 165                  UParseError    *pe,
 166                  UErrorCode     *status);
 167
 168 /**
 169   *  Open (compile) an ICU regular expression.  The resulting regular expression
 170   *   handle can then be used to perform various matching operations.
 171   *  <p>
 172   *   This function is the same as uregex_open, except that the pattern
 173   *   is supplied as an 8 bit char * string in the default code page.
 174   *
 175   * @param pattern        The Regular Expression pattern to be compiled,
 176   *                       NUL terminated.
 177   * @param flags          Flags that alter the default matching behavior for
 178   *                       the regular expression, UREGEX_CASE_INSENSITIVE, for
 179   *                       example.  For default behavior, set this parameter to zero.
 180   *                       See <code>enum URegexpFlag</code>.  All desired flags
 181   *                       are bitwise-ORed together.
 182   * @param pe             Receives the position (line and column numbers) of any syntax
 183   *                       error within the source regular expression string.  If this
 184   *                       information is not wanted, pass NULL for this parameter.
 185   * @param status         Receives errors detected by this function.
 186   * @return               The URegularExpression object representing the compiled
 187   *                       pattern.
 188   *
 189   * @stable ICU 3.0
 190   */
 191 #if !UCONFIG_NO_CONVERSION
 192 U_STABLE URegularExpression * U_EXPORT2
 193 uregex_openC( const char           *pattern,
 194                     uint32_t        flags,
 195                     UParseError    *pe,
 196                     UErrorCode     *status);
 197 #endif
 198
 199
 200
 201 /**
 202   *  Close the regular expression, recovering all resources (memory) it
 203   *   was holding.
 204   *
 205   * @param regexp   The regular expression to be closed.
 206   * @stable ICU 3.0
 207   */
 208 U_STABLE void U_EXPORT2
 209 uregex_close(URegularExpression *regexp);
 210
 211 #if U_SHOW_CPLUSPLUS_API
 212
 213 U_NAMESPACE_BEGIN
 214
 215 /**
 216  * \class LocalURegularExpressionPointer
 217  * "Smart pointer" class, closes a URegularExpression via uregex_close().
 218  * For most methods see the LocalPointerBase base class.
 219  *
 220  * @see LocalPointerBase
 221  * @see LocalPointer
 222  * @stable ICU 4.4
 223  */
 224 U_DEFINE_LOCAL_OPEN_POINTER(LocalURegularExpressionPointer, URegularExpression, uregex_close);
 225
 226 U_NAMESPACE_END
 227
 228 #endif
 229
 230 /**
 231  * Make a copy of a compiled regular expression.  Cloning a regular
 232  * expression is faster than opening a second instance from the source
 233  * form of the expression, and requires less memory.
 234  * <p>
 235  * Note that the current input string and the position of any matched text
 236  *  within it are not cloned; only the pattern itself and the
 237  *  match mode flags are copied.
 238  * <p>
 239  * Cloning can be particularly useful to threaded applications that perform
 240  * multiple match operations in parallel.  Each concurrent RE
 241  * operation requires its own instance of a URegularExpression.
 242  *
 243  * @param regexp   The compiled regular expression to be cloned.
 244  * @param status   Receives indication of any errors encountered
 245  * @return the cloned copy of the compiled regular expression.
 246  * @stable ICU 3.0
 247  */
 248 U_STABLE URegularExpression * U_EXPORT2
 249 uregex_clone(const URegularExpression *regexp, UErrorCode *status);
 250
 251 /**
 252  *  Returns a pointer to the source form of the pattern for this regular expression.
 253  *  This function will work even if the pattern was originally specified as a UText.
 254  *
 255  * @param regexp     The compiled regular expression.
 256  * @param patLength  This output parameter will be set to the length of the
 257  *                   pattern string.  A NULL pointer may be used here if the
 258  *                   pattern length is not needed, as would be the case if
 259  *                   the pattern is known in advance to be a NUL terminated
 260  *                   string.
 261  * @param status     Receives errors detected by this function.
 262  * @return a pointer to the pattern string.  The storage for the string is
 263  *                   owned by the regular expression object, and must not be
 264  *                   altered or deleted by the application.  The returned string
 265  *                   will remain valid until the regular expression is closed.
 266  * @stable ICU 3.0
 267  */
 268 U_STABLE const UChar * U_EXPORT2
 269 uregex_pattern(const URegularExpression *regexp,
 270                      int32_t            *patLength,
 271                      UErrorCode         *status);
 272
 273 /**
 274  *  Returns the source text of the pattern for this regular expression.
 275  *  This function will work even if the pattern was originally specified as a UChar string.
 276  *
 277  * @param regexp     The compiled regular expression.
 278  * @param status     Receives errors detected by this function.
 279  * @return the pattern text.  The storage for the text is owned by the regular expression
 280  *                   object, and must not be altered or deleted.
 281  *
 282  * @stable ICU 4.6
 283  */
 284 U_STABLE UText * U_EXPORT2
 285 uregex_patternUText(const URegularExpression *regexp,
 286                           UErrorCode         *status);
 287
 288 /**
 289   * Get the match mode flags that were specified when compiling this regular expression.
 290   * @param status   Receives errors detected by this function.
 291   * @param regexp   The compiled regular expression.
 292   * @return         The match mode flags
 293   * @see URegexpFlag
 294   * @stable ICU 3.0
 295   */
 296 U_STABLE int32_t U_EXPORT2
 297 uregex_flags(const  URegularExpression   *regexp,
 298                     UErrorCode           *status);
 299
 300
 301 /**
 302   *  Set the subject text string upon which the regular expression will look for matches.
 303   *  This function may be called any number of times, allowing the regular
 304   *  expression pattern to be applied to different strings.
 305   *  <p>
 306   *  Regular expression matching operations work directly on the application's
 307   *  string data.  No copy is made.  The subject string data must not be
 308   *  altered after calling this function until after all regular expression
 309   *  operations involving this string data are completed.
 310   *  <p>
 311   *  Zero length strings are permitted.  In this case, no subsequent match
 312   *  operation will dereference the text string pointer.
 313   *
 314   * @param regexp     The compiled regular expression.
 315   * @param text       The subject text string.
 316   * @param textLength The length of the subject text, or -1 if the string
 317   *                   is NUL terminated.
 318   * @param status     Receives errors detected by this function.
 319   * @stable ICU 3.0
 320   */
 321 U_STABLE void U_EXPORT2
 322 uregex_setText(URegularExpression *regexp,
 323                const UChar        *text,
 324                int32_t             textLength,
 325                UErrorCode         *status);
 326
 327
 328 /**
 329   *  Set the subject text string upon which the regular expression will look for matches.
 330   *  This function may be called any number of times, allowing the regular
 331   *  expression pattern to be applied to different strings.
 332   *  <p>
 333   *  Regular expression matching operations work directly on the application's
 334   *  string data; only a shallow clone is made.  The subject string data must not be
 335   *  altered after calling this function until after all regular expression
 336   *  operations involving this string data are completed.
 337   *
 338   * @param regexp     The compiled regular expression.
 339   * @param text       The subject text string.
 340   * @param status     Receives errors detected by this function.
 341   *
 342   * @stable ICU 4.6
 343   */
 344 U_STABLE void U_EXPORT2
 345 uregex_setUText(URegularExpression *regexp,
 346                 UText              *text,
 347                 UErrorCode         *status);
 348
 349 /**
 350   *  Get the subject text that is currently associated with this
 351   *   regular expression object.  If the input was supplied using uregex_setText(),
 352   *   that pointer will be returned.  Otherwise, the characters in the input will
 353   *   be extracted to a buffer and returned.  In either case, ownership remains
 354   *   with the regular expression object.
 355   *
 356   *  This function will work even if the input was originally specified as a UText.
 357   *
 358   * @param regexp      The compiled regular expression.
 359   * @param textLength  The length of the string is returned in this output parameter.
 360   *                    A NULL pointer may be used here if the
 361   *                    text length is not needed, as would be the case if
 362   *                    the text is known in advance to be a NUL terminated
 363   *                    string.
 364   * @param status      Receives errors detected by this function.
 365   * @return            Pointer to the subject text string currently associated with
 366   *                    this regular expression.
 367   * @stable ICU 3.0
 368   */
 369 U_STABLE const UChar * U_EXPORT2
 370 uregex_getText(URegularExpression *regexp,
 371                int32_t            *textLength,
 372                UErrorCode         *status);
 373
 374 /**
 375   *  Get the subject text that is currently associated with this
 376   *   regular expression object.
 377   *
 378   *  This function will work even if the input was originally specified as a UChar string.
 379   *
 380   * @param regexp      The compiled regular expression.
 381   * @param dest        A mutable UText in which to store the current input.
 382   *                    If NULL, a new UText will be created as an immutable shallow clone
 383   *                    of the actual input string.
 384   * @param status      Receives errors detected by this function.
 385   * @return            The subject text currently associated with this regular expression.
 386   *                    If a pre-allocated UText was provided, it will always be used and returned.
 387   *
 388   * @stable ICU 4.6
 389   */
 390 U_STABLE UText * U_EXPORT2
 391 uregex_getUText(URegularExpression *regexp,
 392                 UText              *dest,
 393                 UErrorCode         *status);
 394
 395 /**
 396   *  Set the subject text string upon which the regular expression is looking for matches
 397   *  without changing any other aspect of the matching state.
 398   *  The new and previous text strings must have the same content.
 399   *
 400   *  This function is intended for use in environments where ICU is operating on
 401   *  strings that may move around in memory.  It provides a mechanism for notifying
 402   *  ICU that the string has been relocated, and providing a new UText to access the
 403   *  string in its new position.
 404   *
 405   *  Note that the regular expression implementation never copies the underlying text
 406   *  of a string being matched, but always operates directly on the original text
 407   *  provided by the user. Refreshing simply drops the references to the old text
 408   *  and replaces them with references to the new.
 409   *
 410   *  Caution:  this function is normally used only by very specialized
 411   *            system-level code.   One example use case is with garbage collection
 412   *            that moves the text in memory.
 413   *
 414   * @param regexp     The compiled regular expression.
 415   * @param text       The new (moved) text string.
 416   * @param status     Receives errors detected by this function.
 417   *
 418   * @stable ICU 4.8
 419   */
 420 U_STABLE void U_EXPORT2
 421 uregex_refreshUText(URegularExpression *regexp,
 422                     UText              *text,
 423                     UErrorCode         *status);
 424
 425 /**
 426   *   Attempts to match the input string against the pattern.
 427   *   To succeed, the match must extend to the end of the string,
 428   *   or cover the complete match region.
 429   *
 430   *   If startIndex >= zero the match operation starts at the specified
 431   *   index and must extend to the end of the input string.  Any region
 432   *   that has been specified is reset.
 433   *
 434   *   If startIndex == -1 the match must cover the input region, or the entire
 435   *   input string if no region has been set.  This directly corresponds to
 436   *   Matcher.matches() in Java
 437   *
 438   *    @param  regexp      The compiled regular expression.
 439   *    @param  startIndex  The input string (native) index at which to begin matching, or -1
 440   *                        to match the input Region.
 441   *    @param  status      Receives errors detected by this function.
 442   *    @return             TRUE if there is a match
 443   *    @stable ICU 3.0
 444   */
 445 U_STABLE UBool U_EXPORT2
 446 uregex_matches(URegularExpression *regexp,
 447                 int32_t            startIndex,
 448                 UErrorCode        *status);
 449
 450 /**
 451   *   64bit version of uregex_matches.
 452   *   Attempts to match the input string against the pattern.
 453   *   To succeed, the match must extend to the end of the string,
 454   *   or cover the complete match region.
 455   *
 456   *   If startIndex >= zero the match operation starts at the specified
 457   *   index and must extend to the end of the input string.  Any region
 458   *   that has been specified is reset.
 459   *
 460   *   If startIndex == -1 the match must cover the input region, or the entire
 461   *   input string if no region has been set.  This directly corresponds to
 462   *   Matcher.matches() in Java
 463   *
 464   *    @param  regexp      The compiled regular expression.
 465   *    @param  startIndex  The input string (native) index at which to begin matching, or -1
 466   *                        to match the input Region.
 467   *    @param  status      Receives errors detected by this function.
 468   *    @return             TRUE if there is a match
 469   *   @stable ICU 4.6
 470   */
 471 U_STABLE UBool U_EXPORT2
 472 uregex_matches64(URegularExpression *regexp,
 473                  int64_t            startIndex,
 474                  UErrorCode        *status);
 475
 476 /**
 477   *   Attempts to match the input string, starting from the specified index, against the pattern.
 478   *   The match may be of any length, and is not required to extend to the end
 479   *   of the input string.  Contrast with uregex_matches().
 480   *
 481   *   <p>If startIndex is >= 0 any input region that was set for this
 482   *   URegularExpression is reset before the operation begins.
 483   *
 484   *   <p>If the specified starting index == -1 the match begins at the start of the input
 485   *   region, or at the start of the full string if no region has been specified.
 486   *   This corresponds directly with Matcher.lookingAt() in Java.
 487   *
 488   *   <p>If the match succeeds then more information can be obtained via the
 489   *    <code>uregexp_start()</code>, <code>uregexp_end()</code>,
 490   *    and <code>uregexp_group()</code> functions.</p>
 491   *
 492   *    @param   regexp      The compiled regular expression.
 493   *    @param   startIndex  The input string (native) index at which to begin matching, or
 494   *                         -1 to match the Input Region
 495   *    @param   status      A reference to a UErrorCode to receive any errors.
 496   *    @return  TRUE if there is a match.
 497   *    @stable ICU 3.0
 498   */
 499 U_STABLE UBool U_EXPORT2
 500 uregex_lookingAt(URegularExpression *regexp,
 501                  int32_t             startIndex,
 502                  UErrorCode         *status);
 503
 504 /**
 505   *   64bit version of uregex_lookingAt.
 506   *   Attempts to match the input string, starting from the specified index, against the pattern.
 507   *   The match may be of any length, and is not required to extend to the end
 508   *   of the input string.  Contrast with uregex_matches().
 509   *
 510   *   <p>If startIndex is >= 0 any input region that was set for this
 511   *   URegularExpression is reset before the operation begins.
 512   *
 513   *   <p>If the specified starting index == -1 the match begins at the start of the input
 514   *   region, or at the start of the full string if no region has been specified.
 515   *   This corresponds directly with Matcher.lookingAt() in Java.
 516   *
 517   *   <p>If the match succeeds then more information can be obtained via the
 518   *    <code>uregexp_start()</code>, <code>uregexp_end()</code>,
 519   *    and <code>uregexp_group()</code> functions.</p>
 520   *
 521   *    @param   regexp      The compiled regular expression.
 522   *    @param   startIndex  The input string (native) index at which to begin matching, or
 523   *                         -1 to match the Input Region
 524   *    @param   status      A reference to a UErrorCode to receive any errors.
 525   *    @return  TRUE if there is a match.
 526   *    @stable ICU 4.6
 527   */
 528 U_STABLE UBool U_EXPORT2
 529 uregex_lookingAt64(URegularExpression *regexp,
 530                    int64_t             startIndex,
 531                    UErrorCode         *status);
 532
 533 /**
 534   *   Find the first matching substring of the input string that matches the pattern.
 535   *   If startIndex is >= zero the search for a match begins at the specified index,
 536   *          and any match region is reset.  This corresponds directly with
 537   *          Matcher.find(startIndex) in Java.
 538   *
 539   *   If startIndex == -1 the search begins at the start of the input region,
 540   *           or at the start of the full string if no region has been specified.
 541   *
 542   *   If a match is found, <code>uregex_start(), uregex_end()</code>, and
 543   *   <code>uregex_group()</code> will provide more information regarding the match.
 544   *
 545   *   @param   regexp      The compiled regular expression.
 546   *   @param   startIndex  The position (native) in the input string to begin the search, or
 547   *                        -1 to search within the Input Region.
 548   *   @param   status      A reference to a UErrorCode to receive any errors.
 549   *   @return              TRUE if a match is found.
 550   *   @stable ICU 3.0
 551   */
 552 U_STABLE UBool U_EXPORT2
 553 uregex_find(URegularExpression *regexp,
 554             int32_t             startIndex,
 555             UErrorCode         *status);
 556
 557 /**
 558   *   64bit version of uregex_find.
 559   *   Find the first matching substring of the input string that matches the pattern.
 560   *   If startIndex is >= zero the search for a match begins at the specified index,
 561   *          and any match region is reset.  This corresponds directly with
 562   *          Matcher.find(startIndex) in Java.
 563   *
 564   *   If startIndex == -1 the search begins at the start of the input region,
 565   *           or at the start of the full string if no region has been specified.
 566   *
 567   *   If a match is found, <code>uregex_start(), uregex_end()</code>, and
 568   *   <code>uregex_group()</code> will provide more information regarding the match.
 569   *
 570   *   @param   regexp      The compiled regular expression.
 571   *   @param   startIndex  The position (native) in the input string to begin the search, or
 572   *                        -1 to search within the Input Region.
 573   *   @param   status      A reference to a UErrorCode to receive any errors.
 574   *   @return              TRUE if a match is found.
 575   *   @stable ICU 4.6
 576   */
 577 U_STABLE UBool U_EXPORT2
 578 uregex_find64(URegularExpression *regexp,
 579               int64_t             startIndex,
 580               UErrorCode         *status);
 581
 582 /**
 583   *  Find the next pattern match in the input string.  Begin searching
 584   *  the input at the location following the end of he previous match,
 585   *  or at the start of the string (or region) if there is no
 586   *  previous match.  If a match is found, <code>uregex_start(), uregex_end()</code>, and
 587   *  <code>uregex_group()</code> will provide more information regarding the match.
 588   *
 589   *  @param   regexp      The compiled regular expression.
 590   *  @param   status      A reference to a UErrorCode to receive any errors.
 591   *  @return              TRUE if a match is found.
 592   *  @see uregex_reset
 593   *  @stable ICU 3.0
 594   */
 595 U_STABLE UBool U_EXPORT2
 596 uregex_findNext(URegularExpression *regexp,
 597                 UErrorCode         *status);
 598
 599 /**
 600   *   Get the number of capturing groups in this regular expression's pattern.
 601   *   @param   regexp      The compiled regular expression.
 602   *   @param   status      A reference to a UErrorCode to receive any errors.
 603   *   @return the number of capture groups
 604   *   @stable ICU 3.0
 605   */
 606 U_STABLE int32_t U_EXPORT2
 607 uregex_groupCount(URegularExpression *regexp,
 608                   UErrorCode         *status);
 609
 610 /** Extract the string for the specified matching expression or subexpression.
 611   * Group #0 is the complete string of matched text.
 612   * Group #1 is the text matched by the first set of capturing parentheses.
 613   *
 614   *   @param   regexp       The compiled regular expression.
 615   *   @param   groupNum     The capture group to extract.  Group 0 is the complete
 616   *                         match.  The value of this parameter must be
 617   *                         less than or equal to the number of capture groups in
 618   *                         the pattern.
 619   *   @param   dest         Buffer to receive the matching string data
 620   *   @param   destCapacity Capacity of the dest buffer.
 621   *   @param   status       A reference to a UErrorCode to receive any errors.
 622   *   @return               Length of matching data,
 623   *                         or -1 if no applicable match.
 624   *   @stable ICU 3.0
 625   */
 626 U_STABLE int32_t U_EXPORT2
 627 uregex_group(URegularExpression *regexp,
 628              int32_t             groupNum,
 629              UChar              *dest,
 630              int32_t             destCapacity,
 631              UErrorCode          *status);
 632
 633 /** Returns a shallow immutable clone of the entire input string.  The returned UText current native index
 634   *   is set to the beginning of the requested capture group.  The capture group length is also
 635   *   returned via groupLength.
 636   * Group #0 is the complete string of matched text.
 637   * Group #1 is the text matched by the first set of capturing parentheses.
 638   *
 639   *   @param   regexp       The compiled regular expression.
 640   *   @param   groupNum     The capture group to extract.  Group 0 is the complete
 641   *                         match.  The value of this parameter must be
 642   *                         less than or equal to the number of capture groups in
 643   *                         the pattern.
 644   *   @param   dest         A mutable UText in which to store the current input.
 645   *                         If NULL, a new UText will be created as an immutable shallow clone
 646   *                         of the entire input string.
 647   *   @param   groupLength  The group length of the desired capture group.
 648   *   @param   status       A reference to a UErrorCode to receive any errors.
 649   *   @return               The subject text currently associated with this regular expression.
 650   *                         If a pre-allocated UText was provided, it will always be used and returned.
 651
 652   *
 653   *   @stable ICU 4.6
 654   */
 655 U_STABLE UText * U_EXPORT2
 656 uregex_groupUText(URegularExpression *regexp,
 657                   int32_t             groupNum,
 658                   UText              *dest,
 659                   int64_t            *groupLength,
 660                   UErrorCode         *status);
 661
 662 #ifndef U_HIDE_INTERNAL_API
 663 /** Extract the string for the specified matching expression or subexpression.
 664   * Group #0 is the complete string of matched text.
 665   * Group #1 is the text matched by the first set of capturing parentheses.
 666   *
 667   *   @param   regexp       The compiled regular expression.
 668   *   @param   groupNum     The capture group to extract.  Group 0 is the complete
 669   *                         match.  The value of this parameter must be
 670   *                         less than or equal to the number of capture groups in
 671   *                         the pattern.
 672   *   @param   dest         Mutable UText to receive the matching string data.
 673   *                         If NULL, a new UText will be created (which may not be mutable).
 674   *   @param   status       A reference to a UErrorCode to receive any errors.
 675   *   @return               The matching string data. If a pre-allocated UText was provided,
 676   *                          it will always be used and returned.
 677   *
 678   *   @internal ICU 4.4 technology preview
 679   */
 680 U_INTERNAL UText * U_EXPORT2
 681 uregex_groupUTextDeep(URegularExpression *regexp,
 682                   int32_t             groupNum,
 683                   UText              *dest,
 684                   UErrorCode         *status);
 685 #endif  /* U_HIDE_INTERNAL_API */
 686
 687 /**
 688   *   Returns the index in the input string of the start of the text matched by the
 689   *   specified capture group during the previous match operation.  Return -1 if
 690   *   the capture group was not part of the last match.
 691   *   Group #0 refers to the complete range of matched text.
 692   *   Group #1 refers to the text matched by the first set of capturing parentheses.
 693   *
 694   *    @param   regexp      The compiled regular expression.
 695   *    @param   groupNum    The capture group number
 696   *    @param   status      A reference to a UErrorCode to receive any errors.
 697   *    @return              the starting (native) position in the input of the text matched
 698   *                         by the specified group.
 699   *    @stable ICU 3.0
 700   */
 701 U_STABLE int32_t U_EXPORT2
 702 uregex_start(URegularExpression *regexp,
 703              int32_t             groupNum,
 704              UErrorCode          *status);
 705
 706 /**
 707   *   64bit version of uregex_start.
 708   *   Returns the index in the input string of the start of the text matched by the
 709   *   specified capture group during the previous match operation.  Return -1 if
 710   *   the capture group was not part of the last match.
 711   *   Group #0 refers to the complete range of matched text.
 712   *   Group #1 refers to the text matched by the first set of capturing parentheses.
 713   *
 714   *    @param   regexp      The compiled regular expression.
 715   *    @param   groupNum    The capture group number
 716   *    @param   status      A reference to a UErrorCode to receive any errors.
 717   *    @return              the starting (native) position in the input of the text matched
 718   *                         by the specified group.
 719   *   @stable ICU 4.6
 720   */
 721 U_STABLE int64_t U_EXPORT2
 722 uregex_start64(URegularExpression *regexp,
 723                int32_t             groupNum,
 724                UErrorCode          *status);
 725
 726 /**
 727   *   Returns the index in the input string of the position following the end
 728   *   of the text matched by the specified capture group.
 729   *   Return -1 if the capture group was not part of the last match.
 730   *   Group #0 refers to the complete range of matched text.
 731   *   Group #1 refers to the text matched by the first set of capturing parentheses.
 732   *
 733   *    @param   regexp      The compiled regular expression.
 734   *    @param   groupNum    The capture group number
 735   *    @param   status      A reference to a UErrorCode to receive any errors.
 736   *    @return              the (native) index of the position following the last matched character.
 737   *    @stable ICU 3.0
 738   */
 739 U_STABLE int32_t U_EXPORT2
 740 uregex_end(URegularExpression   *regexp,
 741            int32_t               groupNum,
 742            UErrorCode           *status);
 743
 744 /**
 745   *   64bit version of uregex_end.
 746   *   Returns the index in the input string of the position following the end
 747   *   of the text matched by the specified capture group.
 748   *   Return -1 if the capture group was not part of the last match.
 749   *   Group #0 refers to the complete range of matched text.
 750   *   Group #1 refers to the text matched by the first set of capturing parentheses.
 751   *
 752   *    @param   regexp      The compiled regular expression.
 753   *    @param   groupNum    The capture group number
 754   *    @param   status      A reference to a UErrorCode to receive any errors.
 755   *    @return              the (native) index of the position following the last matched character.
 756   *   @stable ICU 4.6
 757   */
 758 U_STABLE int64_t U_EXPORT2
 759 uregex_end64(URegularExpression *regexp,
 760              int32_t               groupNum,
 761              UErrorCode           *status);
 762
 763 /**
 764   *  Reset any saved state from the previous match.  Has the effect of
 765   *  causing uregex_findNext to begin at the specified index, and causing
 766   *  uregex_start(), uregex_end() and uregex_group() to return an error
 767   *  indicating that there is no match information available.  Clears any
 768   *  match region that may have been set.
 769   *
 770   *    @param   regexp      The compiled regular expression.
 771   *    @param   index       The position (native) in the text at which a
 772   *                         uregex_findNext() should begin searching.
 773   *    @param   status      A reference to a UErrorCode to receive any errors.
 774   *    @stable ICU 3.0
 775   */
 776 U_STABLE void U_EXPORT2
 777 uregex_reset(URegularExpression    *regexp,
 778              int32_t               index,
 779              UErrorCode            *status);
 780
 781 /**
 782   *  64bit version of uregex_reset.
 783   *  Reset any saved state from the previous match.  Has the effect of
 784   *  causing uregex_findNext to begin at the specified index, and causing
 785   *  uregex_start(), uregex_end() and uregex_group() to return an error
 786   *  indicating that there is no match information available.  Clears any
 787   *  match region that may have been set.
 788   *
 789   *    @param   regexp      The compiled regular expression.
 790   *    @param   index       The position (native) in the text at which a
 791   *                         uregex_findNext() should begin searching.
 792   *    @param   status      A reference to a UErrorCode to receive any errors.
 793   *    @stable ICU 4.6
 794   */
 795 U_STABLE void U_EXPORT2
 796 uregex_reset64(URegularExpression  *regexp,
 797                int64_t               index,
 798                UErrorCode            *status);
 799
 800 /**
 801   * Sets the limits of the matching region for this URegularExpression.
 802   * The region is the part of the input string that will be considered when matching.
 803   * Invoking this method resets any saved state from the previous match,
 804   * then sets the region to start at the index specified by the start parameter
 805   * and end at the index specified by the end parameter.
 806   *
 807   * Depending on the transparency and anchoring being used (see useTransparentBounds
 808   * and useAnchoringBounds), certain constructs such as anchors may behave differently
 809   * at or around the boundaries of the region
 810   *
 811   * The function will fail if start is greater than limit, or if either index
 812   *  is less than zero or greater than the length of the string being matched.
 813   *
 814   * @param regexp The compiled regular expression.
 815   * @param regionStart  The (native) index to begin searches at.
 816   * @param regionLimit  The (native) index to end searches at (exclusive).
 817   * @param status A pointer to a UErrorCode to receive any errors.
 818   * @stable ICU 4.0
 819   */
 820 U_STABLE void U_EXPORT2
 821 uregex_setRegion(URegularExpression   *regexp,
 822                  int32_t               regionStart,
 823                  int32_t               regionLimit,
 824                  UErrorCode           *status);
 825
 826 /**
 827   * 64bit version of uregex_setRegion.
 828   * Sets the limits of the matching region for this URegularExpression.
 829   * The region is the part of the input string that will be considered when matching.
 830   * Invoking this method resets any saved state from the previous match,
 831   * then sets the region to start at the index specified by the start parameter
 832   * and end at the index specified by the end parameter.
 833   *
 834   * Depending on the transparency and anchoring being used (see useTransparentBounds
 835   * and useAnchoringBounds), certain constructs such as anchors may behave differently
 836   * at or around the boundaries of the region
 837   *
 838   * The function will fail if start is greater than limit, or if either index
 839   *  is less than zero or greater than the length of the string being matched.
 840   *
 841   * @param regexp The compiled regular expression.
 842   * @param regionStart  The (native) index to begin searches at.
 843   * @param regionLimit  The (native) index to end searches at (exclusive).
 844   * @param status A pointer to a UErrorCode to receive any errors.
 845   * @stable ICU 4.6
 846   */
 847 U_STABLE void U_EXPORT2
 848 uregex_setRegion64(URegularExpression *regexp,
 849                  int64_t               regionStart,
 850                  int64_t               regionLimit,
 851                  UErrorCode           *status);
 852
 853 /**
 854   *  Set the matching region and the starting index for subsequent matches
 855   *  in a single operation.
 856   *  This is useful because the usual function for setting the starting
 857   *  index, urgex_reset(), also resets any region limits.
 858   *
 859   * @param regexp The compiled regular expression.
 860   * @param regionStart  The (native) index to begin searches at.
 861   * @param regionLimit  The (native) index to end searches at (exclusive).
 862   * @param startIndex   The index in the input text at which the next
 863   *                     match operation should begin.
 864   * @param status A pointer to a UErrorCode to receive any errors.
 865   * @stable ICU 4.6
 866   */
 867 U_STABLE void U_EXPORT2
 868 uregex_setRegionAndStart(URegularExpression *regexp,
 869                  int64_t               regionStart,
 870                  int64_t               regionLimit,
 871                  int64_t               startIndex,
 872                  UErrorCode           *status);
 873
 874 /**
 875   * Reports the start index of the matching region. Any matches found are limited to
 876   * to the region bounded by regionStart (inclusive) and regionEnd (exclusive).
 877   *
 878   * @param regexp The compiled regular expression.
 879   * @param status A pointer to a UErrorCode to receive any errors.
 880   * @return The starting (native) index of this matcher's region.
 881   * @stable ICU 4.0
 882   */
 883 U_STABLE int32_t U_EXPORT2
 884 uregex_regionStart(const  URegularExpression   *regexp,
 885                           UErrorCode           *status);
 886
 887 /**
 888   * 64bit version of uregex_regionStart.
 889   * Reports the start index of the matching region. Any matches found are limited to
 890   * to the region bounded by regionStart (inclusive) and regionEnd (exclusive).
 891   *
 892   * @param regexp The compiled regular expression.
 893   * @param status A pointer to a UErrorCode to receive any errors.
 894   * @return The starting (native) index of this matcher's region.
 895   * @stable ICU 4.6
 896   */
 897 U_STABLE int64_t U_EXPORT2
 898 uregex_regionStart64(const  URegularExpression   *regexp,
 899                             UErrorCode           *status);
 900
 901 /**
 902   * Reports the end index (exclusive) of the matching region for this URegularExpression.
 903   * Any matches found are limited to to the region bounded by regionStart (inclusive)
 904   * and regionEnd (exclusive).
 905   *
 906   * @param regexp The compiled regular expression.
 907   * @param status A pointer to a UErrorCode to receive any errors.
 908   * @return The ending point (native) of this matcher's region.
 909   * @stable ICU 4.0
 910   */
 911 U_STABLE int32_t U_EXPORT2
 912 uregex_regionEnd(const  URegularExpression   *regexp,
 913                         UErrorCode           *status);
 914
 915 /**
 916   * 64bit version of uregex_regionEnd.
 917   * Reports the end index (exclusive) of the matching region for this URegularExpression.
 918   * Any matches found are limited to to the region bounded by regionStart (inclusive)
 919   * and regionEnd (exclusive).
 920   *
 921   * @param regexp The compiled regular expression.
 922   * @param status A pointer to a UErrorCode to receive any errors.
 923   * @return The ending point (native) of this matcher's region.
 924   * @stable ICU 4.6
 925   */
 926 U_STABLE int64_t U_EXPORT2
 927 uregex_regionEnd64(const  URegularExpression   *regexp,
 928                           UErrorCode           *status);
 929
 930 /**
 931   * Queries the transparency of region bounds for this URegularExpression.
 932   * See useTransparentBounds for a description of transparent and opaque bounds.
 933   * By default, matching boundaries are opaque.
 934   *
 935   * @param regexp The compiled regular expression.
 936   * @param status A pointer to a UErrorCode to receive any errors.
 937   * @return TRUE if this matcher is using opaque bounds, false if it is not.
 938   * @stable ICU 4.0
 939   */
 940 U_STABLE UBool U_EXPORT2
 941 uregex_hasTransparentBounds(const  URegularExpression   *regexp,
 942                                    UErrorCode           *status);
 943
 944
 945 /**
 946   * Sets the transparency of region bounds for this URegularExpression.
 947   * Invoking this function with an argument of TRUE will set matches to use transparent bounds.
 948   * If the boolean argument is FALSE, then opaque bounds will be used.
 949   *
 950   * Using transparent bounds, the boundaries of the matching region are transparent
 951   * to lookahead, lookbehind, and boundary matching constructs. Those constructs can
 952   * see text beyond the boundaries of the region while checking for a match.
 953   *
 954   * With opaque bounds, no text outside of the matching region is visible to lookahead,
 955   * lookbehind, and boundary matching constructs.
 956   *
 957   * By default, opaque bounds are used.
 958   *
 959   * @param   regexp The compiled regular expression.
 960   * @param   b      TRUE for transparent bounds; FALSE for opaque bounds
 961   * @param   status A pointer to a UErrorCode to receive any errors.
 962   * @stable ICU 4.0
 963   **/
 964 U_STABLE void U_EXPORT2
 965 uregex_useTransparentBounds(URegularExpression   *regexp,
 966                             UBool                b,
 967                             UErrorCode           *status);
 968
 969
 970 /**
 971   * Return true if this URegularExpression is using anchoring bounds.
 972   * By default, anchoring region bounds are used.
 973   *
 974   * @param  regexp The compiled regular expression.
 975   * @param  status A pointer to a UErrorCode to receive any errors.
 976   * @return TRUE if this matcher is using anchoring bounds.
 977   * @stable ICU 4.0
 978   */
 979 U_STABLE UBool U_EXPORT2
 980 uregex_hasAnchoringBounds(const  URegularExpression   *regexp,
 981                                  UErrorCode           *status);
 982
 983
 984 /**
 985   * Set whether this URegularExpression is using Anchoring Bounds for its region.
 986   * With anchoring bounds, pattern anchors such as ^ and $ will match at the start
 987   * and end of the region.  Without Anchoring Bounds, anchors will only match at
 988   * the positions they would in the complete text.
 989   *
 990   * Anchoring Bounds are the default for regions.
 991   *
 992   * @param regexp The compiled regular expression.
 993   * @param b      TRUE if to enable anchoring bounds; FALSE to disable them.
 994   * @param status A pointer to a UErrorCode to receive any errors.
 995   * @stable ICU 4.0
 996   */
 997 U_STABLE void U_EXPORT2
 998 uregex_useAnchoringBounds(URegularExpression   *regexp,
 999                           UBool                 b,
1000                           UErrorCode           *status);
1001
1002 /**
1003   * Return TRUE if the most recent matching operation touched the
1004   *  end of the text being processed.  In this case, additional input text could
1005   *  change the results of that match.
1006   *
1007   *  @param regexp The compiled regular expression.
1008   *  @param status A pointer to a UErrorCode to receive any errors.
1009   *  @return  TRUE if the most recent match hit the end of input
1010   *  @stable ICU 4.0
1011   */
1012 U_STABLE UBool U_EXPORT2
1013 uregex_hitEnd(const  URegularExpression   *regexp,
1014                      UErrorCode           *status);
1015
1016 /**
1017   * Return TRUE the most recent match succeeded and additional input could cause
1018   * it to fail. If this function returns false and a match was found, then more input
1019   * might change the match but the match won't be lost. If a match was not found,
1020   * then requireEnd has no meaning.
1021   *
1022   * @param regexp The compiled regular expression.
1023   * @param status A pointer to a UErrorCode to receive any errors.
1024   * @return TRUE  if more input could cause the most recent match to no longer match.
1025   * @stable ICU 4.0
1026   */
1027 U_STABLE UBool U_EXPORT2
1028 uregex_requireEnd(const  URegularExpression   *regexp,
1029                          UErrorCode           *status);
1030
1031
1032
1033
1034
1035 /**
1036   *    Replaces every substring of the input that matches the pattern
1037   *    with the given replacement string.  This is a convenience function that
1038   *    provides a complete find-and-replace-all operation.
1039   *
1040   *    This method scans the input string looking for matches of the pattern.
1041   *    Input that is not part of any match is copied unchanged to the
1042   *    destination buffer.  Matched regions are replaced in the output
1043   *    buffer by the replacement string.   The replacement string may contain
1044   *    references to capture groups; these take the form of $1, $2, etc.
1045   *
1046   *    @param   regexp             The compiled regular expression.
1047   *    @param   replacementText    A string containing the replacement text.
1048   *    @param   replacementLength  The length of the replacement string, or
1049   *                                -1 if it is NUL terminated.
1050   *    @param   destBuf            A (UChar *) buffer that will receive the result.
1051   *    @param   destCapacity       The capacity of the destination buffer.
1052   *    @param   status             A reference to a UErrorCode to receive any errors.
1053   *    @return                     The length of the string resulting from the find
1054   *                                and replace operation.  In the event that the
1055   *                                destination capacity is inadequate, the return value
1056   *                                is still the full length of the untruncated string.
1057   *    @stable ICU 3.0
1058   */
1059 U_STABLE int32_t U_EXPORT2
1060 uregex_replaceAll(URegularExpression    *regexp,
1061                   const UChar           *replacementText,
1062                   int32_t                replacementLength,
1063                   UChar                 *destBuf,
1064                   int32_t                destCapacity,
1065                   UErrorCode            *status);
1066
1067 /**
1068   *    Replaces every substring of the input that matches the pattern
1069   *    with the given replacement string.  This is a convenience function that
1070   *    provides a complete find-and-replace-all operation.
1071   *
1072   *    This method scans the input string looking for matches of the pattern.
1073   *    Input that is not part of any match is copied unchanged to the
1074   *    destination buffer.  Matched regions are replaced in the output
1075   *    buffer by the replacement string.   The replacement string may contain
1076   *    references to capture groups; these take the form of $1, $2, etc.
1077   *
1078   *    @param   regexp         The compiled regular expression.
1079   *    @param   replacement    A string containing the replacement text.
1080   *    @param   dest           A mutable UText that will receive the result.
1081   *                             If NULL, a new UText will be created (which may not be mutable).
1082   *    @param   status         A reference to a UErrorCode to receive any errors.
1083   *    @return                 A UText containing the results of the find and replace.
1084   *                             If a pre-allocated UText was provided, it will always be used and returned.
1085   *
1086   *    @stable ICU 4.6
1087   */
1088 U_STABLE UText * U_EXPORT2
1089 uregex_replaceAllUText(URegularExpression *regexp,
1090                        UText              *replacement,
1091                        UText              *dest,
1092                        UErrorCode         *status);
1093
1094 /**
1095   *    Replaces the first substring of the input that matches the pattern
1096   *    with the given replacement string.  This is a convenience function that
1097   *    provides a complete find-and-replace operation.
1098   *
1099   *    This method scans the input string looking for a match of the pattern.
1100   *    All input that is not part of the match is copied unchanged to the
1101   *    destination buffer.  The matched region is replaced in the output
1102   *    buffer by the replacement string.   The replacement string may contain
1103   *    references to capture groups; these take the form of $1, $2, etc.
1104   *
1105   *    @param   regexp             The compiled regular expression.
1106   *    @param   replacementText    A string containing the replacement text.
1107   *    @param   replacementLength  The length of the replacement string, or
1108   *                                -1 if it is NUL terminated.
1109   *    @param   destBuf            A (UChar *) buffer that will receive the result.
1110   *    @param   destCapacity       The capacity of the destination buffer.
1111   *    @param   status             a reference to a UErrorCode to receive any errors.
1112   *    @return                     The length of the string resulting from the find
1113   *                                and replace operation.  In the event that the
1114   *                                destination capacity is inadequate, the return value
1115   *                                is still the full length of the untruncated string.
1116   *    @stable ICU 3.0
1117   */
1118 U_STABLE int32_t U_EXPORT2
1119 uregex_replaceFirst(URegularExpression  *regexp,
1120                     const UChar         *replacementText,
1121                     int32_t              replacementLength,
1122                     UChar               *destBuf,
1123                     int32_t              destCapacity,
1124                     UErrorCode          *status);
1125
1126 /**
1127   *    Replaces the first substring of the input that matches the pattern
1128   *    with the given replacement string.  This is a convenience function that
1129   *    provides a complete find-and-replace operation.
1130   *
1131   *    This method scans the input string looking for a match of the pattern.
1132   *    All input that is not part of the match is copied unchanged to the
1133   *    destination buffer.  The matched region is replaced in the output
1134   *    buffer by the replacement string.   The replacement string may contain
1135   *    references to capture groups; these take the form of $1, $2, etc.
1136   *
1137   *    @param   regexp         The compiled regular expression.
1138   *    @param   replacement    A string containing the replacement text.
1139   *    @param   dest           A mutable UText that will receive the result.
1140   *                             If NULL, a new UText will be created (which may not be mutable).
1141   *    @param   status         A reference to a UErrorCode to receive any errors.
1142   *    @return                 A UText containing the results of the find and replace.
1143   *                             If a pre-allocated UText was provided, it will always be used and returned.
1144   *
1145   *    @stable ICU 4.6
1146   */
1147 U_STABLE UText * U_EXPORT2
1148 uregex_replaceFirstUText(URegularExpression *regexp,
1149                          UText              *replacement,
1150                          UText              *dest,
1151                          UErrorCode         *status);
1152
1153 /**
1154   *   Implements a replace operation intended to be used as part of an
1155   *   incremental find-and-replace.
1156   *
1157   *   <p>The input string, starting from the end of the previous match and ending at
1158   *   the start of the current match, is appended to the destination string.  Then the
1159   *   replacement string is appended to the output string,
1160   *   including handling any substitutions of captured text.</p>
1161   *
1162   *   <p>A note on preflight computation of buffersize and error handling:
1163   *   Calls to uregex_appendReplacement() and uregex_appendTail() are
1164   *   designed to be chained, one after another, with the destination
1165   *   buffer pointer and buffer capacity updated after each in preparation
1166   *   to for the next.  If the destination buffer is exhausted partway through such a
1167   *   sequence, a U_BUFFER_OVERFLOW_ERROR status will be returned.  Normal
1168   *   ICU conventions are for a function to perform no action if it is
1169   *   called with an error status, but for this one case, uregex_appendRepacement()
1170   *   will operate normally so that buffer size computations will complete
1171   *   correctly.
1172   *
1173   *   <p>For simple, prepackaged, non-incremental find-and-replace
1174   *      operations, see replaceFirst() or replaceAll().</p>
1175   *
1176   *   @param   regexp      The regular expression object.
1177   *   @param   replacementText The string that will replace the matched portion of the
1178   *                        input string as it is copied to the destination buffer.
1179   *                        The replacement text may contain references ($1, for
1180   *                        example) to capture groups from the match.
1181   *   @param   replacementLength  The length of the replacement text string,
1182   *                        or -1 if the string is NUL terminated.
1183   *   @param   destBuf     The buffer into which the results of the
1184   *                        find-and-replace are placed.  On return, this pointer
1185   *                        will be updated to refer to the beginning of the
1186   *                        unused portion of buffer, leaving it in position for
1187   *                        a subsequent call to this function.
1188   *   @param   destCapacity The size of the output buffer,  On return, this
1189   *                        parameter will be updated to reflect the space remaining
1190   *                        unused in the output buffer.
1191   *   @param   status      A reference to a UErrorCode to receive any errors.
1192   *   @return              The length of the result string.  In the event that
1193   *                        destCapacity is inadequate, the full length of the
1194   *                        untruncated output string is returned.
1195   *
1196   *   @stable ICU 3.0
1197   *
1198   */
1199 U_STABLE int32_t U_EXPORT2
1200 uregex_appendReplacement(URegularExpression    *regexp,
1201                          const UChar           *replacementText,
1202                          int32_t                replacementLength,
1203                          UChar                **destBuf,
1204                          int32_t               *destCapacity,
1205                          UErrorCode            *status);
1206
1207 /**
1208   *   Implements a replace operation intended to be used as part of an
1209   *   incremental find-and-replace.
1210   *
1211   *   <p>The input string, starting from the end of the previous match and ending at
1212   *   the start of the current match, is appended to the destination string.  Then the
1213   *   replacement string is appended to the output string,
1214   *   including handling any substitutions of captured text.</p>
1215   *
1216   *   <p>For simple, prepackaged, non-incremental find-and-replace
1217   *      operations, see replaceFirst() or replaceAll().</p>
1218   *
1219   *   @param   regexp      The regular expression object.
1220   *   @param   replacementText The string that will replace the matched portion of the
1221   *                        input string as it is copied to the destination buffer.
1222   *                        The replacement text may contain references ($1, for
1223   *                        example) to capture groups from the match.
1224   *   @param   dest        A mutable UText that will receive the result. Must not be NULL.
1225   *   @param   status      A reference to a UErrorCode to receive any errors.
1226   *
1227   *   @stable ICU 4.6
1228   */
1229 U_STABLE void U_EXPORT2
1230 uregex_appendReplacementUText(URegularExpression    *regexp,
1231                               UText                 *replacementText,
1232                               UText                 *dest,
1233                               UErrorCode            *status);
1234
1235 /**
1236   * As the final step in a find-and-replace operation, append the remainder
1237   * of the input string, starting at the position following the last match,
1238   * to the destination string. <code>uregex_appendTail()</code> is intended
1239   *  to be invoked after one or more invocations of the
1240   *  <code>uregex_appendReplacement()</code> function.
1241   *
1242   *   @param   regexp      The regular expression object.  This is needed to
1243   *                        obtain the input string and with the position
1244   *                        of the last match within it.
1245   *   @param   destBuf     The buffer in which the results of the
1246   *                        find-and-replace are placed.  On return, the pointer
1247   *                        will be updated to refer to the beginning of the
1248   *                        unused portion of buffer.
1249   *   @param   destCapacity The size of the output buffer,  On return, this
1250   *                        value will be updated to reflect the space remaining
1251   *                        unused in the output buffer.
1252   *   @param   status      A reference to a UErrorCode to receive any errors.
1253   *   @return              The length of the result string.  In the event that
1254   *                        destCapacity is inadequate, the full length of the
1255   *                        untruncated output string is returned.
1256   *
1257   *   @stable ICU 3.0
1258   */
1259 U_STABLE int32_t U_EXPORT2
1260 uregex_appendTail(URegularExpression    *regexp,
1261                   UChar                **destBuf,
1262                   int32_t               *destCapacity,
1263                   UErrorCode            *status);
1264
1265 /**
1266   * As the final step in a find-and-replace operation, append the remainder
1267   * of the input string, starting at the position following the last match,
1268   * to the destination string. <code>uregex_appendTailUText()</code> is intended
1269   *  to be invoked after one or more invocations of the
1270   *  <code>uregex_appendReplacementUText()</code> function.
1271   *
1272   *   @param   regexp      The regular expression object.  This is needed to
1273   *                        obtain the input string and with the position
1274   *                        of the last match within it.
1275   *   @param   dest        A mutable UText that will receive the result. Must not be NULL.
1276   *
1277   *   @param status        Error code
1278   *
1279   *   @return              The destination UText.
1280   *
1281   *   @stable ICU 4.6
1282   */
1283 U_STABLE UText * U_EXPORT2
1284 uregex_appendTailUText(URegularExpression    *regexp,
1285                        UText                 *dest,
1286                        UErrorCode            *status);
1287
1288  /**
1289    * Split a string into fields.  Somewhat like split() from Perl.
1290    *  The pattern matches identify delimiters that separate the input
1291    *  into fields.  The input data between the matches becomes the
1292    *  fields themselves.
1293    *
1294    *  Each of the fields is copied from the input string to the destination
1295    *  buffer, and NUL terminated.  The position of each field within
1296    *  the destination buffer is returned in the destFields array.
1297    *
1298    *  If the delimiter pattern includes capture groups, the captured text will
1299    *  also appear in the destination array of output strings, interspersed
1300    *  with the fields.  This is similar to Perl, but differs from Java,
1301    *  which ignores the presence of capture groups in the pattern.
1302    *
1303    *  Trailing empty fields will always be returned, assuming sufficient
1304    *  destination capacity.  This differs from the default behavior for Java
1305    *  and Perl where trailing empty fields are not returned.
1306    *
1307    *  The number of strings produced by the split operation is returned.
1308    *  This count includes the strings from capture groups in the delimiter pattern.
1309    *  This behavior differs from Java, which ignores capture groups.
1310    *
1311    *    @param   regexp      The compiled regular expression.
1312    *    @param   destBuf     A (UChar *) buffer to receive the fields that
1313    *                         are extracted from the input string. These
1314    *                         field pointers will refer to positions within the
1315    *                         destination buffer supplied by the caller.  Any
1316    *                         extra positions within the destFields array will be
1317    *                         set to NULL.
1318    *    @param   destCapacity The capacity of the destBuf.
1319    *    @param   requiredCapacity  The actual capacity required of the destBuf.
1320    *                         If destCapacity is too small, requiredCapacity will return
1321    *                         the total capacity required to hold all of the output, and
1322    *                         a U_BUFFER_OVERFLOW_ERROR will be returned.
1323    *    @param   destFields  An array to be filled with the position of each
1324    *                         of the extracted fields within destBuf.
1325    *    @param   destFieldsCapacity  The number of elements in the destFields array.
1326    *                If the number of fields found is less than destFieldsCapacity,
1327    *                the extra destFields elements are set to zero.
1328    *                If destFieldsCapacity is too small, the trailing part of the
1329    *                input, including any field delimiters, is treated as if it
1330    *                were the last field - it is copied to the destBuf, and
1331    *                its position is in the destBuf is stored in the last element
1332    *                of destFields.  This behavior mimics that of Perl.  It is not
1333    *                an error condition, and no error status is returned when all destField
1334    *                positions are used.
1335    * @param status  A reference to a UErrorCode to receive any errors.
1336    * @return        The number of fields into which the input string was split.
1337    * @stable ICU 3.0
1338    */
1339 U_STABLE int32_t U_EXPORT2
1340 uregex_split(   URegularExpression      *regexp,
1341                   UChar                 *destBuf,
1342                   int32_t                destCapacity,
1343                   int32_t               *requiredCapacity,
1344                   UChar                 *destFields[],
1345                   int32_t                destFieldsCapacity,
1346                   UErrorCode            *status);
1347
1348   /**
1349    * Split a string into fields.  Somewhat like split() from Perl.
1350    * The pattern matches identify delimiters that separate the input
1351    *  into fields.  The input data between the matches becomes the
1352    *  fields themselves.
1353    * <p>
1354    * The behavior of this function is not very closely aligned with uregex_split();
1355    * instead, it is based on (and implemented directly on top of) the C++ split method.
1356    *
1357    * @param regexp  The compiled regular expression.
1358    * @param destFields    An array of mutable UText structs to receive the results of the split.
1359    *                If a field is NULL, a new UText is allocated to contain the results for
1360    *                that field. This new UText is not guaranteed to be mutable.
1361    * @param destFieldsCapacity  The number of elements in the destination array.
1362    *                If the number of fields found is less than destCapacity, the
1363    *                extra strings in the destination array are not altered.
1364    *                If the number of destination strings is less than the number
1365    *                of fields, the trailing part of the input string, including any
1366    *                field delimiters, is placed in the last destination string.
1367    *                This behavior mimics that of Perl.  It is not  an error condition, and no
1368    *                error status is returned when all destField positions are used.
1369    * @param status  A reference to a UErrorCode to receive any errors.
1370    * @return        The number of fields into which the input string was split.
1371    *
1372    * @stable ICU 4.6
1373    */
1374 U_STABLE int32_t U_EXPORT2
1375 uregex_splitUText(URegularExpression    *regexp,
1376                   UText                 *destFields[],
1377                   int32_t                destFieldsCapacity,
1378                   UErrorCode            *status);
1379
1380 /**
1381  * Set a processing time limit for match operations with this URegularExpression.
1382  *
1383  * Some patterns, when matching certain strings, can run in exponential time.
1384  * For practical purposes, the match operation may appear to be in an
1385  * infinite loop.
1386  * When a limit is set a match operation will fail with an error if the
1387  * limit is exceeded.
1388  * <p>
1389  * The units of the limit are steps of the match engine.
1390  * Correspondence with actual processor time will depend on the speed
1391  * of the processor and the details of the specific pattern, but will
1392  * typically be on the order of milliseconds.
1393  * <p>
1394  * By default, the matching time is not limited.
1395  * <p>
1396  *
1397  * @param   regexp      The compiled regular expression.
1398  * @param   limit       The limit value, or 0 for no limit.
1399  * @param   status      A reference to a UErrorCode to receive any errors.
1400  * @stable ICU 4.0
1401  */
1402 U_STABLE void U_EXPORT2
1403 uregex_setTimeLimit(URegularExpression      *regexp,
1404                     int32_t                  limit,
1405                     UErrorCode              *status);
1406
1407 /**
1408  * Get the time limit for for matches with this URegularExpression.
1409  * A return value of zero indicates that there is no limit.
1410  *
1411  * @param   regexp      The compiled regular expression.
1412  * @param   status      A reference to a UErrorCode to receive any errors.
1413  * @return the maximum allowed time for a match, in units of processing steps.
1414  * @stable ICU 4.0
1415  */
1416 U_STABLE int32_t U_EXPORT2
1417 uregex_getTimeLimit(const URegularExpression      *regexp,
1418                           UErrorCode              *status);
1419
1420 /**
1421  * Set the amount of heap storage available for use by the match backtracking stack.
1422  * <p>
1423  * ICU uses a backtracking regular expression engine, with the backtrack stack
1424  * maintained on the heap.  This function sets the limit to the amount of memory
1425  * that can be used  for this purpose.  A backtracking stack overflow will
1426  * result in an error from the match operation that caused it.
1427  * <p>
1428  * A limit is desirable because a malicious or poorly designed pattern can use
1429  * excessive memory, potentially crashing the process.  A limit is enabled
1430  * by default.
1431  * <p>
1432  * @param   regexp      The compiled regular expression.
1433  * @param   limit       The maximum size, in bytes, of the matching backtrack stack.
1434  *                      A value of -1 means no limit.
1435  *                      The limit must be greater than zero, or -1.
1436  * @param   status      A reference to a UErrorCode to receive any errors.
1437  *
1438  * @stable ICU 4.0
1439  */
1440 U_STABLE void U_EXPORT2
1441 uregex_setStackLimit(URegularExpression      *regexp,
1442                      int32_t                  limit,
1443                      UErrorCode              *status);
1444
1445 /**
1446  * Get the size of the heap storage available for use by the back tracking stack.
1447  *
1448  * @return  the maximum backtracking stack size, in bytes, or zero if the
1449  *          stack size is unlimited.
1450  * @stable ICU 4.0
1451  */
1452 U_STABLE int32_t U_EXPORT2
1453 uregex_getStackLimit(const URegularExpression      *regexp,
1454                            UErrorCode              *status);
1455
1456
1457 /**
1458  * Function pointer for a regular expression matching callback function.
1459  * When set, a callback function will be called periodically during matching
1460  * operations.  If the call back function returns FALSE, the matching
1461  * operation will be terminated early.
1462  *
1463  * Note:  the callback function must not call other functions on this
1464  *        URegularExpression.
1465  *
1466  * @param context  context pointer.  The callback function will be invoked
1467  *                 with the context specified at the time that
1468  *                 uregex_setMatchCallback() is called.
1469  * @param steps    the accumulated processing time, in match steps,
1470  *                 for this matching operation.
1471  * @return         TRUE to continue the matching operation.
1472  *                 FALSE to terminate the matching operation.
1473  * @stable ICU 4.0
1474  */
1475 U_CDECL_BEGIN
1476 typedef UBool U_CALLCONV URegexMatchCallback (
1477                    const void *context,
1478                    int32_t     steps);
1479 U_CDECL_END
1480
1481 /**
1482  * Set a callback function for this URegularExpression.
1483  * During matching operations the function will be called periodically,
1484  * giving the application the opportunity to terminate a long-running
1485  * match.
1486  *
1487  * @param   regexp      The compiled regular expression.
1488  * @param   callback    A pointer to the user-supplied callback function.
1489  * @param   context     User context pointer.  The value supplied at the
1490  *                      time the callback function is set will be saved
1491  *                      and passed to the callback each time that it is called.
1492  * @param   status      A reference to a UErrorCode to receive any errors.
1493  * @stable ICU 4.0
1494  */
1495 U_STABLE void U_EXPORT2
1496 uregex_setMatchCallback(URegularExpression      *regexp,
1497                         URegexMatchCallback     *callback,
1498                         const void              *context,
1499                         UErrorCode              *status);
1500
1501
1502 /**
1503  *  Get the callback function for this URegularExpression.
1504  *
1505  * @param   regexp      The compiled regular expression.
1506  * @param   callback    Out parameter, receives a pointer to the user-supplied
1507  *                      callback function.
1508  * @param   context     Out parameter, receives the user context pointer that
1509  *                      was set when uregex_setMatchCallback() was called.
1510  * @param   status      A reference to a UErrorCode to receive any errors.
1511  * @stable ICU 4.0
1512  */
1513 U_STABLE void U_EXPORT2
1514 uregex_getMatchCallback(const URegularExpression    *regexp,
1515                         URegexMatchCallback        **callback,
1516                         const void                 **context,
1517                         UErrorCode                  *status);
1518
1519 /**
1520  * Function pointer for a regular expression find callback function.
1521  *
1522  * When set, a callback function will be called during a find operation
1523  * and for operations that depend on find, such as findNext, split and some replace
1524  * operations like replaceFirst.
1525  * The callback will usually be called after each attempt at a match, but this is not a
1526  * guarantee that the callback will be invoked at each character.  For finds where the
1527  * match engine is invoked at each character, this may be close to true, but less likely
1528  * for more optimized loops where the pattern is known to only start, and the match
1529  * engine invoked, at certain characters.
1530  * When invoked, this callback will specify the index at which a match operation is about
1531  * to be attempted, giving the application the opportunity to terminate a long-running
1532  * find operation.
1533  *
1534  * If the call back function returns FALSE, the find operation will be terminated early.
1535  *
1536  * Note:  the callback function must not call other functions on this
1537  *        URegularExpression
1538  *
1539  * @param context  context pointer.  The callback function will be invoked
1540  *                 with the context specified at the time that
1541  *                 uregex_setFindProgressCallback() is called.
1542  * @param matchIndex  the next index at which a match attempt will be attempted for this
1543  *                 find operation.  If this callback interrupts the search, this is the
1544  *                 index at which a find/findNext operation may be re-initiated.
1545  * @return         TRUE to continue the matching operation.
1546  *                 FALSE to terminate the matching operation.
1547  * @stable ICU 4.6
1548  */
1549 U_CDECL_BEGIN
1550 typedef UBool U_CALLCONV URegexFindProgressCallback (
1551                    const void *context,
1552                    int64_t     matchIndex);
1553 U_CDECL_END
1554
1555
1556 /**
1557  *  Set the find progress callback function for this URegularExpression.
1558  *
1559  * @param   regexp      The compiled regular expression.
1560  * @param   callback    A pointer to the user-supplied callback function.
1561  * @param   context     User context pointer.  The value supplied at the
1562  *                      time the callback function is set will be saved
1563  *                      and passed to the callback each time that it is called.
1564  * @param   status      A reference to a UErrorCode to receive any errors.
1565  * @stable ICU 4.6
1566  */
1567 U_STABLE void U_EXPORT2
1568 uregex_setFindProgressCallback(URegularExpression              *regexp,
1569                                 URegexFindProgressCallback      *callback,
1570                                 const void                      *context,
1571                                 UErrorCode                      *status);
1572
1573 /**
1574  *  Get the find progress callback function for this URegularExpression.
1575  *
1576  * @param   regexp      The compiled regular expression.
1577  * @param   callback    Out parameter, receives a pointer to the user-supplied
1578  *                      callback function.
1579  * @param   context     Out parameter, receives the user context pointer that
1580  *                      was set when uregex_setFindProgressCallback() was called.
1581  * @param   status      A reference to a UErrorCode to receive any errors.
1582  * @stable ICU 4.6
1583  */
1584 U_STABLE void U_EXPORT2
1585 uregex_getFindProgressCallback(const URegularExpression          *regexp,
1586                                 URegexFindProgressCallback        **callback,
1587                                 const void                        **context,
1588                                 UErrorCode                        *status);
1589
1590 #endif   /*  !UCONFIG_NO_REGULAR_EXPRESSIONS  */
1591 #endif   /*  UREGEX_H  */