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revision 155 by ph10, Tue Apr 24 13:36:11 2007 UTC revision 261 by ph10, Fri Sep 21 08:37:48 2007 UTC
# Line 2  News about PCRE releases Line 2  News about PCRE releases
2  ------------------------  ------------------------
3    
4    
5    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. There have also been some documentation
12    updates, in particular, some more information about using CMake to build PCRE
13    has been added to the NON-UNIX-USE file.
14    
15    
16    Release 7.3 28-Aug-07
17    ---------------------
18    
19    Most changes are bug fixes. Some that are not:
20    
21    1. There is some support for Perl 5.10's experimental "backtracking control
22       verbs" such as (*PRUNE).
23    
24    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
25       restrictive in the strings it accepts.
26    
27    3. Checking for potential integer overflow has been made more dynamic, and as a
28       consequence there is no longer a hard limit on the size of a subpattern that
29       has a limited repeat count.
30    
31    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
32       no longer advance by two characters instead of one when an unanchored match
33       fails at CRLF if there are explicit CR or LF matches within the pattern.
34       This gets rid of some anomalous effects that previously occurred.
35    
36    5. Some PCRE-specific settings for varying the newline options at the start of
37       a pattern have been added.
38    
39    
40    Release 7.2 19-Jun-07
41    ---------------------
42    
43    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
44    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
45    and \V).
46    
47    Correction to the notes for 7.1: the note about shared libraries for Windows is
48    wrong. Previously, three libraries were built, but each could function
49    independently. For example, the pcreposix library also included all the
50    functions from the basic pcre library. The change is that the three libraries
51    are no longer independent. They are like the Unix libraries. To use the
52    pcreposix functions, for example, you need to link with both the pcreposix and
53    the basic pcre library.
54    
55    Some more features from Perl 5.10 have been added:
56    
57      (?-n) and (?+n) relative references for recursion and subroutines.
58    
59      (?(-n) and (?(+n) relative references as conditions.
60    
61      \k{name} and \g{name} are synonyms for \k<name>.
62    
63      \K to reset the start of the matched string; for example, (foo)\Kbar
64      matches bar preceded by foo, but only sets bar as the matched string.
65    
66      (?| introduces a group where the capturing parentheses in each alternative
67      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
68      parentheses number 1 in both cases.
69    
70      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
71    
72    
73  Release 7.1 24-Apr-07  Release 7.1 24-Apr-07
74  ---------------------  ---------------------
75    

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