/[pcre]/code/trunk/doc/pcrepattern.3
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revision 177 by ph10, Mon Jun 11 13:38:38 2007 UTC revision 178 by ph10, Wed Jun 13 08:44:34 2007 UTC
# Line 260  parenthesized subpatterns. Line 260  parenthesized subpatterns.
260  Another use of backslash is for specifying generic character types. The  Another use of backslash is for specifying generic character types. The
261  following are always recognized:  following are always recognized:
262  .sp  .sp
263    \ed     any decimal digit    \ed     any decimal digit
264    \eD     any character that is not a decimal digit    \eD     any character that is not a decimal digit
265      \eh     any horizontal whitespace character
266      \eH     any character that is not a horizontal whitespace character
267    \es     any whitespace character    \es     any whitespace character
268    \eS     any character that is not a whitespace character    \eS     any character that is not a whitespace character
269      \ev     any vertical whitespace character
270      \eV     any character that is not a vertical whitespace character
271    \ew     any "word" character    \ew     any "word" character
272    \eW     any "non-word" character    \eW     any "non-word" character
273  .sp  .sp
# Line 277  there is no character to match. Line 281  there is no character to match.
281  .P  .P
282  For compatibility with Perl, \es does not match the VT character (code 11).  For compatibility with Perl, \es does not match the VT character (code 11).
283  This makes it different from the the POSIX "space" class. The \es characters  This makes it different from the the POSIX "space" class. The \es characters
284  are HT (9), LF (10), FF (12), CR (13), and space (32). (If "use locale;" is  are HT (9), LF (10), FF (12), CR (13), and space (32). If "use locale;" is
285  included in a Perl script, \es may match the VT character. In PCRE, it never  included in a Perl script, \es may match the VT character. In PCRE, it never
286  does.)  does.
287    .P
288    In UTF-8 mode, characters with values greater than 128 never match \ed, \es, or
289    \ew, and always match \eD, \eS, and \eW. This is true even when Unicode
290    character property support is available. These sequences retain their original
291    meanings from before UTF-8 support was available, mainly for efficiency
292    reasons.
293    .P
294    The sequences \eh, \eH, \ev, and \eV are Perl 5.10 features. In contrast to the
295    other sequences, these do match certain high-valued codepoints in UTF-8 mode.
296    The horizontal space characters are:
297    .sp
298      U+0009     Horizontal tab
299      U+0020     Space
300      U+00A0     Non-break space
301      U+1680     Ogham space mark
302      U+180E     Mongolian vowel separator
303      U+2000     En quad
304      U+2001     Em quad
305      U+2002     En space
306      U+2003     Em space
307      U+2004     Three-per-em space
308      U+2005     Four-per-em space
309      U+2006     Six-per-em space
310      U+2007     Figure space
311      U+2008     Punctuation space
312      U+2009     Thin space
313      U+200A     Hair space
314      U+202F     Narrow no-break space
315      U+205F     Medium mathematical space
316      U+3000     Ideographic space
317    .sp
318    The vertical space characters are:
319    .sp
320      U+000A     Linefeed
321      U+000B     Vertical tab
322      U+000C     Formfeed
323      U+000D     Carriage return
324      U+0085     Next line
325      U+2028     Line separator
326      U+2029     Paragraph separator
327  .P  .P
328  A "word" character is an underscore or any character less than 256 that is a  A "word" character is an underscore or any character less than 256 that is a
329  letter or digit. The definition of letters and digits is controlled by PCRE's  letter or digit. The definition of letters and digits is controlled by PCRE's
# Line 295  in the Line 339  in the
339  .\"  .\"
340  page). For example, in a French locale such as "fr_FR" in Unix-like systems,  page). For example, in a French locale such as "fr_FR" in Unix-like systems,
341  or "french" in Windows, some character codes greater than 128 are used for  or "french" in Windows, some character codes greater than 128 are used for
342  accented letters, and these are matched by \ew.  accented letters, and these are matched by \ew. The use of locales with Unicode
343  .P  is discouraged.
 In UTF-8 mode, characters with values greater than 128 never match \ed, \es, or  
 \ew, and always match \eD, \eS, and \eW. This is true even when Unicode  
 character property support is available. The use of locales with Unicode is  
 discouraged.  
344  .  .
345  .  .
346  .SS "Newline sequences"  .SS "Newline sequences"
347  .rs  .rs
348  .sp  .sp
349  Outside a character class, the escape sequence \eR matches any Unicode newline  Outside a character class, the escape sequence \eR matches any Unicode newline
350  sequence. This is an extension to Perl. In non-UTF-8 mode \eR is equivalent to  sequence. This is a Perl 5.10 feature. In non-UTF-8 mode \eR is equivalent to
351  the following:  the following:
352  .sp  .sp
353    (?>\er\en|\en|\ex0b|\ef|\er|\ex85)    (?>\er\en|\en|\ex0b|\ef|\er|\ex85)
# Line 1933  Cambridge CB2 3QH, England. Line 1973  Cambridge CB2 3QH, England.
1973  .rs  .rs
1974  .sp  .sp
1975  .nf  .nf
1976  Last updated: 11 June 2007  Last updated: 13 June 2007
1977  Copyright (c) 1997-2007 University of Cambridge.  Copyright (c) 1997-2007 University of Cambridge.
1978  .fi  .fi

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