/////////////////////////////////////////////////////////////////////////////
// Name: regex.h
-// Purpose: documentation for wxRegEx class
+// Purpose: interface of wxRegEx
// Author: wxWidgets team
// RCS-ID: $Id$
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
+/**
+ Flags for regex compilation to be used with Compile().
+*/
+enum
+{
+ /** Use extended regex syntax. */
+ wxRE_EXTENDED = 0,
+
+ /** Use advanced RE syntax (built-in regex only). */
+ wxRE_ADVANCED = 1,
+
+ /** Use basic RE syntax. */
+ wxRE_BASIC = 2,
+
+ /** Ignore case in match. */
+ wxRE_ICASE = 4,
+
+ /** Only check match, don't set back references. */
+ wxRE_NOSUB = 8,
+
+ /**
+ If not set, treat '\n' as an ordinary character, otherwise it is
+ special: it is not matched by '.' and '^' and '$' always match
+ after/before it regardless of the setting of wxRE_NOT[BE]OL.
+ */
+ wxRE_NEWLINE = 16,
+
+ /** Default flags.*/
+ wxRE_DEFAULT = wxRE_EXTENDED
+};
+
+/**
+ Flags for regex matching to be used with Matches().
+ These flags are mainly useful when doing several matches in a long string
+ to prevent erroneous matches for ¡¯¡¯ and ¡¯$¡¯:
+*/
+enum
+{
+ /** '^' doesn't match at the start of line. */
+ wxRE_NOTBOL = 32,
+
+ /** '$' doesn't match at the end of line. */
+ wxRE_NOTEOL = 64
+};
+
/**
@class wxRegEx
@wxheader{regex.h}
-
+
wxRegEx represents a regular expression. This class provides support
for regular expressions matching and also replacement.
-
+
It is built on top of either the system library (if it has support
for POSIX regular expressions - which is the case of the most modern
Unices) or uses the built in Henry Spencer's library. Henry Spencer
would appreciate being given credit in the documentation of software
which uses his library, but that is not a requirement.
-
+
Regular expressions, as defined by POSIX, come in two flavours: @e extended
and @e basic. The builtin library also adds a third flavour
- of expression advanced, which is not available
+ of expression @ref overview_resyntax "advanced", which is not available
when using the system library.
-
+
Unicode is fully supported only when using the builtin library.
When using the system library in Unicode mode, the expressions and data
are translated to the default 8-bit encoding before being passed to
the library.
-
+
On platforms where a system library is available, the default is to use
the builtin library for Unicode builds, and the system library otherwise.
It is possible to use the other if preferred by selecting it when building
the wxWidgets.
-
+
@library{wxbase}
@category{data}
-
- @seealso
- wxRegEx::ReplaceFirst
+
+ Examples:
+
+ A bad example of processing some text containing email addresses (the example
+ is bad because the real email addresses can have more complicated form than
+ @c user@host.net):
+
+ @code
+ wxString text;
+ ...
+ wxRegEx reEmail = wxT("([^@]+)@([[:alnum:].-_].)+([[:alnum:]]+)");
+ if ( reEmail.Matches(text) )
+ {
+ wxString text = reEmail.GetMatch(email);
+ wxString username = reEmail.GetMatch(email, 1);
+ if ( reEmail.GetMatch(email, 3) == wxT("com") ) // .com TLD?
+ {
+ ...
+ }
+ }
+
+ // or we could do this to hide the email address
+ size_t count = reEmail.ReplaceAll(text, wxT("HIDDEN@\\2\\3"));
+ printf("text now contains %u hidden addresses", count);
+ @endcode
*/
-class wxRegEx
+class wxRegEx
{
public:
- //@{
+
/**
- Create and compile the regular expression, use
- IsValid() to test for compilation errors.
+ Default constructor: use Compile() later.
*/
wxRegEx();
- wxRegEx(const wxString& expr, int flags = wxRE_DEFAULT);
- //@}
/**
- dtor not virtual, don't derive from this class
+ Create and compile the regular expression, use
+ IsValid() to test for compilation errors.
+
+ @todo Add referece to the flag enum.
+ */
+ wxRegEx(const wxString& expr, int flags = wxRE_DEFAULT);
+
+
+ /**
+ Destructor. It's not virtual, don't derive from this class.
*/
~wxRegEx();
/**
- Compile the string into regular expression, return @true if ok or @false
+ Compile the string into regular expression, return @true if ok or @false
if string has a syntax error.
+
+ @todo Add referece to the flag enum.
*/
bool Compile(const wxString& pattern, int flags = wxRE_DEFAULT);
- //@{
/**
- Returns the part of string corresponding to the match where @e index is
- interpreted as above. Empty string is returned if match failed
-
- May only be called after successful call to Matches()
- and only if @c wxRE_NOSUB was @b not used in
- Compile().
+ Get the start index and the length of the match of the expression
+ (if @a index is 0) or a bracketed subexpression (@a index different from 0).
+
+ May only be called after successful call to Matches() and only if @c wxRE_NOSUB
+ was @b not used in Compile().
+
+ Returns @false if no match or if an error occurred.
+
*/
- bool GetMatch(size_t* start, size_t* len, size_t index = 0);
- not wxString GetMatch(const wxString& text,
- size_t index = 0);
- //@}
+ bool GetMatch(size_t* start, size_t* len, size_t index = 0) const;
+
+ /**
+ Returns the part of string corresponding to the match where index is interpreted
+ as above. Empty string is returned if match failed.
+
+ May only be called after successful call to Matches() and only if @c wxRE_NOSUB
+ was @b not used in Compile().
+ */
+ wxString GetMatch(const wxString& text, size_t index = 0) const;
/**
Returns the size of the array of matches, i.e. the number of bracketed
subexpressions plus one for the expression itself, or 0 on error.
-
+
May only be called after successful call to Compile().
and only if @c wxRE_NOSUB was @b not used.
*/
- size_t GetMatchCount();
+ size_t GetMatchCount() const;
/**
- Return @true if this is a valid compiled regular expression, @false
+ Return @true if this is a valid compiled regular expression, @false
otherwise.
*/
- bool IsValid();
+ bool IsValid() const;
//@{
/**
- Matches the precompiled regular expression against the string @e text,
+ Matches the precompiled regular expression against the string @a text,
returns @true if matches and @false otherwise.
-
+
@e Flags may be combination of @c wxRE_NOTBOL and @c wxRE_NOTEOL.
-
+ @todo Add referece to the flag enum.
+
Some regex libraries assume that the text given is null terminated, while
others require the length be given as a separate parameter. Therefore for
- maximum portability assume that @e text cannot contain embedded nulls.
-
- When the @e Matches(const wxChar *text, int flags = 0) form is used,
- a @e wxStrlen() will be done internally if the regex library requires the
- length. When using @e Matches() in a loop
- the @e Matches(text, flags, len) form can be used instead, making it
- possible to avoid a @e wxStrlen() inside the loop.
-
+ maximum portability assume that @a text cannot contain embedded nulls.
+
+ When the <b>Matches(const wxChar *text, int flags = 0)</b> form is used,
+ a wxStrlen() will be done internally if the regex library requires the
+ length. When using Matches() in a loop the <b>Matches(text, flags, len)</b>
+ form can be used instead, making it possible to avoid a wxStrlen() inside
+ the loop.
+
May only be called after successful call to Compile().
*/
- bool Matches(const wxChar* text, int flags = 0);
- bool Matches(const wxChar* text, int flags, size_t len);
- bool Matches(const wxString& text, int flags = 0);
+ bool Matches(const wxChar* text, int flags = 0) const;
+ const bool Matches(const wxChar* text, int flags, size_t len) const;
//@}
+ /**
+ Matches the precompiled regular expression against the string @a text,
+ returns @true if matches and @false otherwise.
+
+ @e Flags may be combination of @c wxRE_NOTBOL and @c wxRE_NOTEOL.
+ @todo Add referece to the flag enum.
+
+ May only be called after successful call to Compile().
+ */
+ const bool Matches(const wxString& text, int flags = 0) const;
+
/**
Replaces the current regular expression in the string pointed to by
- @e text, with the text in @e replacement and return number of matches
+ @a text, with the text in @a replacement and return number of matches
replaced (maybe 0 if none found) or -1 on error.
-
- The replacement text may contain back references @c \number which will be
+
+ The replacement text may contain back references @c \\number which will be
replaced with the value of the corresponding subexpression in the
- pattern match. @c \0 corresponds to the entire match and @c is a
- synonym for it. Backslash may be used to quote itself or @c character.
-
- @e maxMatches may be used to limit the number of replacements made, setting
+ pattern match. @c \\0 corresponds to the entire match and @c \& is a
+ synonym for it. Backslash may be used to quote itself or @c \& character.
+
+ @a maxMatches may be used to limit the number of replacements made, setting
it to 1, for example, will only replace first occurrence (if any) of the
pattern in the text while default value of 0 means replace all.
*/
int Replace(wxString* text, const wxString& replacement,
- size_t maxMatches = 0);
+ size_t maxMatches = 0) const;
/**
- Replace all occurrences: this is actually a synonym for
+ Replace all occurrences: this is actually a synonym for
Replace().
-
- @sa ReplaceFirst()
+
+ @see ReplaceFirst()
*/
- int ReplaceAll(wxString* text, const wxString& replacement);
+ int ReplaceAll(wxString* text, const wxString& replacement) const;
/**
Replace the first occurrence.
*/
- int ReplaceFirst(wxString* text, const wxString& replacement);
+ int ReplaceFirst(wxString* text, const wxString& replacement) const;
};
+
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