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revision 87 by nigel, Sat Feb 24 21:41:21 2007 UTC revision 261 by ph10, Fri Sep 21 08:37:48 2007 UTC
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1  News about PCRE releases  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
74    ---------------------
75    
76    There is only one new feature in this release: a linebreak setting of
77    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
78    recognizes only CRLF, CR, and LF as linebreaks.
79    
80    A few bugs are fixed (see ChangeLog for details), but the major change is a
81    complete re-implementation of the build system. This now has full Autotools
82    support and so is now "standard" in some sense. It should help with compiling
83    PCRE in a wide variety of environments.
84    
85    NOTE: when building shared libraries for Windows, three dlls are now built,
86    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
87    included in a single dll.
88    
89    Another important change is that the dftables auxiliary program is no longer
90    compiled and run at "make" time by default. Instead, a default set of character
91    tables (assuming ASCII coding) is used. If you want to use dftables to generate
92    the character tables as previously, add --enable-rebuild-chartables to the
93    "configure" command. You must do this if you are compiling PCRE to run on a
94    system that uses EBCDIC code.
95    
96    There is a discussion about character tables in the README file. The default is
97    not to use dftables so that that there is no problem when cross-compiling.
98    
99    
100    Release 7.0 19-Dec-06
101    ---------------------
102    
103    This release has a new major number because there have been some internal
104    upheavals to facilitate the addition of new optimizations and other facilities,
105    and to make subsequent maintenance and extension easier. Compilation is likely
106    to be a bit slower, but there should be no major effect on runtime performance.
107    Previously compiled patterns are NOT upwards compatible with this release. If
108    you have saved compiled patterns from a previous release, you will have to
109    re-compile them. Important changes that are visible to users are:
110    
111    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
112       some more scripts.
113    
114    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
115       sequence as a newline.
116    
117    3. The \R escape matches a single Unicode newline sequence as a single unit.
118    
119    4. New features that will appear in Perl 5.10 are now in PCRE. These include
120       alternative Perl syntax for named parentheses, and Perl syntax for
121       recursion.
122    
123    5. The C++ wrapper interface has been extended by the addition of a
124       QuoteMeta function and the ability to allow copy construction and
125       assignment.
126    
127    For a complete list of changes, see the ChangeLog file.
128    
129    
130    Release 6.7 04-Jul-06
131    ---------------------
132    
133    The main additions to this release are the ability to use the same name for
134    multiple sets of parentheses, and support for CRLF line endings in both the
135    library and pcregrep (and in pcretest for testing).
136    
137    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
138    significantly reduced for certain subject strings.
139    
140    
141  Release 6.5 01-Feb-06  Release 6.5 01-Feb-06
142  ---------------------  ---------------------
143    

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