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revision 91 by nigel, Sat Feb 24 21:41:34 2007 UTC revision 298 by ph10, Thu Jan 10 17:09:12 2008 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
4    Release 7.5 10-Jan-08
5    ---------------------
7    This is mainly a bug-fix release. However the ability to link pcregrep with
8    libz or libbz2 and the ability to link pcretest with libreadline have been
9    added. Also the --line-offsets and --file-offsets options were added to
10    pcregrep.
13    Release 7.4 21-Sep-07
14    ---------------------
16    The only change of specification is the addition of options to control whether
17    \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
18    Otherwise, the changes are bug fixes and a refactoring to reduce the number of
19    relocations needed in a shared library. There have also been some documentation
20    updates, in particular, some more information about using CMake to build PCRE
21    has been added to the NON-UNIX-USE file.
24    Release 7.3 28-Aug-07
25    ---------------------
27    Most changes are bug fixes. Some that are not:
29    1. There is some support for Perl 5.10's experimental "backtracking control
30       verbs" such as (*PRUNE).
32    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
33       restrictive in the strings it accepts.
35    3. Checking for potential integer overflow has been made more dynamic, and as a
36       consequence there is no longer a hard limit on the size of a subpattern that
37       has a limited repeat count.
39    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
40       no longer advance by two characters instead of one when an unanchored match
41       fails at CRLF if there are explicit CR or LF matches within the pattern.
42       This gets rid of some anomalous effects that previously occurred.
44    5. Some PCRE-specific settings for varying the newline options at the start of
45       a pattern have been added.
48    Release 7.2 19-Jun-07
49    ---------------------
51    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
52    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
53    and \V).
55    Correction to the notes for 7.1: the note about shared libraries for Windows is
56    wrong. Previously, three libraries were built, but each could function
57    independently. For example, the pcreposix library also included all the
58    functions from the basic pcre library. The change is that the three libraries
59    are no longer independent. They are like the Unix libraries. To use the
60    pcreposix functions, for example, you need to link with both the pcreposix and
61    the basic pcre library.
63    Some more features from Perl 5.10 have been added:
65      (?-n) and (?+n) relative references for recursion and subroutines.
67      (?(-n) and (?(+n) relative references as conditions.
69      \k{name} and \g{name} are synonyms for \k<name>.
71      \K to reset the start of the matched string; for example, (foo)\Kbar
72      matches bar preceded by foo, but only sets bar as the matched string.
74      (?| introduces a group where the capturing parentheses in each alternative
75      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
76      parentheses number 1 in both cases.
78      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
81    Release 7.1 24-Apr-07
82    ---------------------
84    There is only one new feature in this release: a linebreak setting of
85    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
86    recognizes only CRLF, CR, and LF as linebreaks.
88    A few bugs are fixed (see ChangeLog for details), but the major change is a
89    complete re-implementation of the build system. This now has full Autotools
90    support and so is now "standard" in some sense. It should help with compiling
91    PCRE in a wide variety of environments.
93    NOTE: when building shared libraries for Windows, three dlls are now built,
94    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
95    included in a single dll.
97    Another important change is that the dftables auxiliary program is no longer
98    compiled and run at "make" time by default. Instead, a default set of character
99    tables (assuming ASCII coding) is used. If you want to use dftables to generate
100    the character tables as previously, add --enable-rebuild-chartables to the
101    "configure" command. You must do this if you are compiling PCRE to run on a
102    system that uses EBCDIC code.
104    There is a discussion about character tables in the README file. The default is
105    not to use dftables so that that there is no problem when cross-compiling.
108    Release 7.0 19-Dec-06
109    ---------------------
111    This release has a new major number because there have been some internal
112    upheavals to facilitate the addition of new optimizations and other facilities,
113    and to make subsequent maintenance and extension easier. Compilation is likely
114    to be a bit slower, but there should be no major effect on runtime performance.
115    Previously compiled patterns are NOT upwards compatible with this release. If
116    you have saved compiled patterns from a previous release, you will have to
117    re-compile them. Important changes that are visible to users are:
119    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
120       some more scripts.
122    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
123       sequence as a newline.
125    3. The \R escape matches a single Unicode newline sequence as a single unit.
127    4. New features that will appear in Perl 5.10 are now in PCRE. These include
128       alternative Perl syntax for named parentheses, and Perl syntax for
129       recursion.
131    5. The C++ wrapper interface has been extended by the addition of a
132       QuoteMeta function and the ability to allow copy construction and
133       assignment.
135    For a complete list of changes, see the ChangeLog file.
138  Release 6.7 04-Jul-06  Release 6.7 04-Jul-06
139  ---------------------  ---------------------

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