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revision 172 by ph10, Tue Jun 5 10:40:13 2007 UTC revision 260 by ph10, Thu Sep 20 10:19:16 2007 UTC
# Line 2  News about PCRE releases Line 2  News about PCRE releases
2  ------------------------  ------------------------
3    
4    
5  Release 7.2 30-Apr-07  Release 7.4 21-Sep-07
6    ---------------------
7    
8    The only change of specification is the addition of options to control whether
9    \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
10    Otherwise, the changes are bug fixes and a refactoring to reduce the number of
11    relocations needed in a shared library.
12    
13    
14    Release 7.3 28-Aug-07
15    ---------------------
16    
17    Most changes are bug fixes. Some that are not:
18    
19    1. There is some support for Perl 5.10's experimental "backtracking control
20       verbs" such as (*PRUNE).
21    
22    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
23       restrictive in the strings it accepts.
24    
25    3. Checking for potential integer overflow has been made more dynamic, and as a
26       consequence there is no longer a hard limit on the size of a subpattern that
27       has a limited repeat count.
28    
29    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
30       no longer advance by two characters instead of one when an unanchored match
31       fails at CRLF if there are explicit CR or LF matches within the pattern.
32       This gets rid of some anomalous effects that previously occurred.
33    
34    5. Some PCRE-specific settings for varying the newline options at the start of
35       a pattern have been added.
36    
37    
38    Release 7.2 19-Jun-07
39  ---------------------  ---------------------
40    
41  WARNING: saved patterns that were compiled by earlier versions of PCRE must be  WARNING: saved patterns that were compiled by earlier versions of PCRE must be
42  recompiled for use with 7.2 (necessitated by the addition of \K).  recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
43    and \V).
44    
45  Correction to the notes for 7.1: the note about shared libraries for Windows is  Correction to the notes for 7.1: the note about shared libraries for Windows is
46  wrong. Previously, three libraries were built, but each could function  wrong. Previously, three libraries were built, but each could function
# Line 20  Some more features from Perl 5.10 have b Line 54  Some more features from Perl 5.10 have b
54    
55    (?-n) and (?+n) relative references for recursion and subroutines.    (?-n) and (?+n) relative references for recursion and subroutines.
56    
   (Not sure if this one is actually in Perl 5.10)  
57    (?(-n) and (?(+n) relative references as conditions.    (?(-n) and (?(+n) relative references as conditions.
58    
59      \k{name} and \g{name} are synonyms for \k<name>.
60    
61    \K to reset the start of the matched string; for example, (foo)\Kbar    \K to reset the start of the matched string; for example, (foo)\Kbar
62    matches bar preceded by foo, but only sets bar as the matched string    matches bar preceded by foo, but only sets bar as the matched string.
63    
64      (?| introduces a group where the capturing parentheses in each alternative
65      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
66      parentheses number 1 in both cases.
67    
68      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
69    
70    
71  Release 7.1 24-Apr-07  Release 7.1 24-Apr-07

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