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revision 155 by ph10, Tue Apr 24 13:36:11 2007 UTC revision 226 by ph10, Tue Aug 21 11:46:08 2007 UTC
# Line 2  News about PCRE releases Line 2  News about PCRE releases
2  ------------------------  ------------------------
3    
4    
5    Release 7.3 20-Aug-07
6    ---------------------
7    
8    Most changes are bug fixes. Some that are not:
9    
10    1. There is some support for Perl 5.10's experimental "backtracking control
11       verbs" such as (*PRUNE).
12    
13    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
14       restrictive in the strings it accepts.
15    
16    3. Checking for potential integer overflow has been made more dynamic, and as a
17       consequence there is no longer a hard limit on the size of a subpattern that
18       has a limited repeat count.
19    
20    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
21       no longer advance by two characters instead of one when an unanchored match
22       fails at CRLF if there are explicit CR or LF matches within the pattern.
23       This gets rid of some anomalous effects that previously occurred.
24    
25    
26    Release 7.2 19-Jun-07
27    ---------------------
28    
29    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
30    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
31    and \V).
32    
33    Correction to the notes for 7.1: the note about shared libraries for Windows is
34    wrong. Previously, three libraries were built, but each could function
35    independently. For example, the pcreposix library also included all the
36    functions from the basic pcre library. The change is that the three libraries
37    are no longer independent. They are like the Unix libraries. To use the
38    pcreposix functions, for example, you need to link with both the pcreposix and
39    the basic pcre library.
40    
41    Some more features from Perl 5.10 have been added:
42    
43      (?-n) and (?+n) relative references for recursion and subroutines.
44    
45      (?(-n) and (?(+n) relative references as conditions.
46    
47      \k{name} and \g{name} are synonyms for \k<name>.
48    
49      \K to reset the start of the matched string; for example, (foo)\Kbar
50      matches bar preceded by foo, but only sets bar as the matched string.
51    
52      (?| introduces a group where the capturing parentheses in each alternative
53      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
54      parentheses number 1 in both cases.
55    
56      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
57    
58    
59  Release 7.1 24-Apr-07  Release 7.1 24-Apr-07
60  ---------------------  ---------------------
61    

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