/[pcre]/code/trunk/doc/html/pcrecompat.html

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-revision 93 by nigel,
Sat Feb 24 21:41:42 2007 UTC
+revision 231 by ph10,
Tue Sep 11 11:15:33 2007 UTC
 Line 18 
 DIFFERENCES BETWEEN PCRE AND PERL
  <P>
  This document describes the differences in the ways that PCRE and Perl handle
  regular expressions. The differences described here are mainly with respect to
- Perl 5.8, though PCRE version 7.0 contains some features that are expected to
+ Perl 5.8, though PCRE versions 7.0 and later contain some features that are
- be in the forthcoming Perl 5.10.
+ expected to be in the forthcoming Perl 5.10.
  </P>
  <P>
 . PCRE has only a subset of Perl's UTF-8 and Unicode support. Details of what
 Line 95 
 strings when part of a pattern is repeat
  the pattern /^(a(b)?)+$/ in Perl leaves $2 unset, but in PCRE it is set to "b".
  </P>
  <P>
-. PCRE provides some extensions to the Perl regular expression facilities.
+. PCRE does support Perl 5.10's backtracking verbs (*ACCEPT), (*FAIL), (*F),
+ (*COMMIT), (*PRUNE), (*SKIP), and (*THEN), but only in the forms without an
+ argument. PCRE does not support (*MARK). If (*ACCEPT) is within capturing
+ parentheses, PCRE does not set that capture group; this is different to Perl.
+ </P>
+ <P>
+. PCRE provides some extensions to the Perl regular expression facilities.
  Perl 5.10 will include new features that are not in earlier versions, some of
  which (such as named parentheses) have been in PCRE for some time. This list is
  with respect to Perl 5.10:
-Line 111 
 meta-character matches only at the very
+Line 117 
 meta-character matches only at the very
  <br>
  <br>
  (c) If PCRE_EXTRA is set, a backslash followed by a letter with no special
- meaning is faulted. Otherwise, like Perl, the backslash is ignored. (Perl can
+ meaning is faulted. Otherwise, like Perl, the backslash is quietly ignored.
- be made to issue a warning.)
+ (Perl can be made to issue a warning.)
  <br>
  <br>
  (d) If PCRE_UNGREEDY is set, the greediness of the repetition quantifiers is
-Line 128 
 only at the first matching position in t
+Line 134 
 only at the first matching position in t
  options for <b>pcre_exec()</b> have no Perl equivalents.
  <br>
  <br>
- (g) The callout facility is PCRE-specific.
+ (g) The \R escape sequence can be restricted to match only CR, LF, or CRLF
+ by the PCRE_BSR_ANYCRLF option.
+ <br>
  <br>
+ (h) The callout facility is PCRE-specific.
  <br>
- (h) The partial matching facility is PCRE-specific.
  <br>
+ (i) The partial matching facility is PCRE-specific.
  <br>
- (i) Patterns compiled by PCRE can be saved and re-used at a later time, even on
+ <br>
+ (j) Patterns compiled by PCRE can be saved and re-used at a later time, even on
  different hosts that have the other endianness.
  <br>
  <br>
- (j) The alternative matching function (<b>pcre_dfa_exec()</b>) matches in a
+ (k) The alternative matching function (<b>pcre_dfa_exec()</b>) matches in a
  different way and is not Perl-compatible.
+ <br>
+ <br>
+ (l) PCRE recognizes some special sequences such as (*CR) at the start of
+ a pattern that set overall options that cannot be changed within the pattern.
  </P>
+ <br><b>
+ AUTHOR
+ </b><br>
  <P>
- Last updated: 28 November 2006
+ Philip Hazel
+ <br>
+ University Computing Service
+ <br>
+ Cambridge CB2 3QH, England.
+ <br>
+ </P>
+ <br><b>
+ REVISION
+ </b><br>
+ <P>
+ Last updated: 11 September 2007
+ <br>
+ Copyright &copy; 1997-2007 University of Cambridge.
  <br>
- Copyright &copy; 1997-2006 University of Cambridge.
  <p>
  Return to the <a href="index.html">PCRE index page</a>.
  </p>

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