X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f220b00998c85886f1e42176b83996abdeb98a2c..c266eff98c5e44012647f54f38a1e29ecabd8759:/docs/latex/wx/regex.tex?ds=sidebyside diff --git a/docs/latex/wx/regex.tex b/docs/latex/wx/regex.tex index 91ac1c6374..59026f0d71 100644 --- a/docs/latex/wx/regex.tex +++ b/docs/latex/wx/regex.tex @@ -11,14 +11,29 @@ \section{\class{wxRegEx}}\label{wxregex} -wxRegEx represents a regular expression. The regular expressions syntax -supported is the POSIX one. Both basic and extended regular expressions are -supported but, unlike POSIX C API, the extended ones are used by default. - -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 from tcl. +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: {\it extended} +and {\it basic}. The builtin library also adds a third flavour +of expression \helpref{advanced}{wxresyn}, 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. \wxheading{Derived from} @@ -31,8 +46,13 @@ Flags for regex compilation to be used with \helpref{Compile()}{wxregexcompile}: \begin{verbatim} enum { - // use extended regex syntax (default) + // use extended regex syntax wxRE_EXTENDED = 0, + + // use advanced RE syntax (built-in regex only) +#ifdef wxHAS_REGEX_ADVANCED + wxRE_ADVANCED = 1, +#endif // use basic RE syntax wxRE_BASIC = 2, @@ -78,22 +98,30 @@ is bad because the real email addresses can have more complicated form than \begin{verbatim} wxString text; ... -wxRegEx reEmail = "([^@]+)@([[:alnum:].-_].)+([[:alnum:]]+)"; +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) == "com" ) // .com TLD? + 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, "HIDDEN@\\2\\3"); +size_t count = reEmail.ReplaceAll(text, wxT("HIDDEN@\\2\\3")); printf("text now contains %u hidden addresses", count); \end{verbatim} +\wxheading{Include files} + + + +\wxheading{Library} + +\helpref{wxBase}{librarieslist} + \latexignore{\rtfignore{\wxheading{Members}}} \membersection{wxRegEx::wxRegEx}\label{wxregexwxregex} @@ -139,7 +167,7 @@ May only be called after successful call to \helpref{Matches()}{wxregexmatches} and only if {\tt wxRE\_NOSUB} was {\bf not} used in \helpref{Compile()}{wxregexcompile}. -Returns {\tt false} if no match or if an error occured. +Returns {\tt false} if no match or if an error occurred. \constfunc{wxString}{GetMatch}{\param{const wxString\& }{text}, \param{size\_t }{index = 0}} @@ -150,14 +178,38 @@ May only be called after successful call to \helpref{Matches()}{wxregexmatches} and only if {\tt wxRE\_NOSUB} was {\bf not} used in \helpref{Compile()}{wxregexcompile}. +\membersection{wxRegEx::GetMatchCount}\label{wxregexgetmatchcount} + +\constfunc{size\_t}{GetMatchCount}{\void} + +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 \helpref{Compile()}{wxregexcompile}. +and only if {\tt wxRE\_NOSUB} was {\bf not} used. + \membersection{wxRegEx::Matches}\label{wxregexmatches} \constfunc{bool}{Matches}{\param{const wxChar* }{text}, \param{int }{flags = 0}} +\constfunc{bool}{Matches}{\param{const wxChar* }{text}, \param{int }{flags}, \param{size\_t }{len}} + +\constfunc{bool}{Matches}{\param{const wxString\& }{text}, \param{int }{flags = 0}} + Matches the precompiled regular expression against the string {\it text}, returns {\tt true} if matches and {\tt false} otherwise. -Flags may be combination of {\tt wxRE\_NOTBOL} and {\tt wxRE\_NOTEOL}. +{\it Flags} may be combination of {\tt wxRE\_NOTBOL} and {\tt wxRE\_NOTEOL}. + +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 {\it text} cannot contain embedded nulls. + +When the {\it Matches(const wxChar *text, int flags = 0)} form is used, +a {\it wxStrlen()} will be done internally if the regex library requires the +length. When using {\it Matches()} in a loop +the {\it Matches(text, flags, len)} form can be used instead, making it +possible to avoid a {\it wxStrlen()} inside the loop. May only be called after successful call to \helpref{Compile()}{wxregexcompile}.