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revision 211 by ph10, Thu Aug 9 09:52:43 2007 UTC revision 447 by ph10, Tue Sep 15 18:17:54 2009 UTC
# Line 7  PCRE - Perl-compatible regular expressio Line 7  PCRE - Perl-compatible regular expressio
7  This document describes the differences in the ways that PCRE and Perl handle  This document describes the differences in the ways that PCRE and Perl handle
8  regular expressions. The differences described here are mainly with respect to  regular expressions. The differences described here are mainly with respect to
9  Perl 5.8, though PCRE versions 7.0 and later contain some features that are  Perl 5.8, though PCRE versions 7.0 and later contain some features that are
10  expected to be in the forthcoming Perl 5.10.  in Perl 5.10.
11  .P  .P
12  1. PCRE has only a subset of Perl's UTF-8 and Unicode support. Details of what  1. PCRE has only a subset of Perl's UTF-8 and Unicode support. Details of what
13  it does have are given in the  it does have are given in the
# Line 83  the pattern /^(a(b)?)+$/ in Perl leaves Line 83  the pattern /^(a(b)?)+$/ in Perl leaves
83  .P  .P
84  11. PCRE does support Perl 5.10's backtracking verbs (*ACCEPT), (*FAIL), (*F),  11. PCRE does support Perl 5.10's backtracking verbs (*ACCEPT), (*FAIL), (*F),
85  (*COMMIT), (*PRUNE), (*SKIP), and (*THEN), but only in the forms without an  (*COMMIT), (*PRUNE), (*SKIP), and (*THEN), but only in the forms without an
86  argument. PCRE does not support (*MARK). If (*ACCEPT) is within capturing  argument. PCRE does not support (*MARK).
 parentheses, PCRE does not set that capture group; this is different to Perl.  
87  .P  .P
88  12. PCRE provides some extensions to the Perl regular expression facilities.  12. PCRE provides some extensions to the Perl regular expression facilities.
89  Perl 5.10 will include new features that are not in earlier versions, some of  Perl 5.10 will include new features that are not in earlier versions, some of
# Line 109  question mark they are. Line 108  question mark they are.
108  (e) PCRE_ANCHORED can be used at matching time to force a pattern to be tried  (e) PCRE_ANCHORED can be used at matching time to force a pattern to be tried
109  only at the first matching position in the subject string.  only at the first matching position in the subject string.
110  .sp  .sp
111  (f) The PCRE_NOTBOL, PCRE_NOTEOL, PCRE_NOTEMPTY, and PCRE_NO_AUTO_CAPTURE  (f) The PCRE_NOTBOL, PCRE_NOTEOL, PCRE_NOTEMPTY, PCRE_NOTEMPTY_ATSTART, and
112  options for \fBpcre_exec()\fP have no Perl equivalents.  PCRE_NO_AUTO_CAPTURE options for \fBpcre_exec()\fP have no Perl equivalents.
113  .sp  .sp
114  (g) The callout facility is PCRE-specific.  (g) The \eR escape sequence can be restricted to match only CR, LF, or CRLF
115    by the PCRE_BSR_ANYCRLF option.
116  .sp  .sp
117  (h) The partial matching facility is PCRE-specific.  (h) The callout facility is PCRE-specific.
118  .sp  .sp
119  (i) Patterns compiled by PCRE can be saved and re-used at a later time, even on  (i) The partial matching facility is PCRE-specific.
120    .sp
121    (j) Patterns compiled by PCRE can be saved and re-used at a later time, even on
122  different hosts that have the other endianness.  different hosts that have the other endianness.
123  .sp  .sp
124  (j) The alternative matching function (\fBpcre_dfa_exec()\fP) matches in a  (k) The alternative matching function (\fBpcre_dfa_exec()\fP) matches in a
125  different way and is not Perl-compatible.  different way and is not Perl-compatible.
126    .sp
127    (l) PCRE recognizes some special sequences such as (*CR) at the start of
128    a pattern that set overall options that cannot be changed within the pattern.
129  .  .
130  .  .
131  .SH AUTHOR  .SH AUTHOR
# Line 137  Cambridge CB2 3QH, England. Line 142  Cambridge CB2 3QH, England.
142  .rs  .rs
143  .sp  .sp
144  .nf  .nf
145  Last updated: 08 August 2007  Last updated: 15 September 2009
146  Copyright (c) 1997-2007 University of Cambridge.  Copyright (c) 1997-2009 University of Cambridge.
147  .fi  .fi

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