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revision 77 by nigel, Sat Feb 24 21:40:45 2007 UTC revision 184 by ph10, Tue Jun 19 13:26:46 2007 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
5    Release 7.2 19-Jun-07
6    ---------------------
8    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
9    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
10    and \V).
12    Correction to the notes for 7.1: the note about shared libraries for Windows is
13    wrong. Previously, three libraries were built, but each could function
14    independently. For example, the pcreposix library also included all the
15    functions from the basic pcre library. The change is that the three libraries
16    are no longer independent. They are like the Unix libraries. To use the
17    pcreposix functions, for example, you need to link with both the pcreposix and
18    the basic pcre library.
20    Some more features from Perl 5.10 have been added:
22      (?-n) and (?+n) relative references for recursion and subroutines.
24      (?(-n) and (?(+n) relative references as conditions.
26      \k{name} and \g{name} are synonyms for \k<name>.
28      \K to reset the start of the matched string; for example, (foo)\Kbar
29      matches bar preceded by foo, but only sets bar as the matched string.
31      (?| introduces a group where the capturing parentheses in each alternative
32      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
33      parentheses number 1 in both cases.
35      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
38    Release 7.1 24-Apr-07
39    ---------------------
41    There is only one new feature in this release: a linebreak setting of
42    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
43    recognizes only CRLF, CR, and LF as linebreaks.
45    A few bugs are fixed (see ChangeLog for details), but the major change is a
46    complete re-implementation of the build system. This now has full Autotools
47    support and so is now "standard" in some sense. It should help with compiling
48    PCRE in a wide variety of environments.
50    NOTE: when building shared libraries for Windows, three dlls are now built,
51    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
52    included in a single dll.
54    Another important change is that the dftables auxiliary program is no longer
55    compiled and run at "make" time by default. Instead, a default set of character
56    tables (assuming ASCII coding) is used. If you want to use dftables to generate
57    the character tables as previously, add --enable-rebuild-chartables to the
58    "configure" command. You must do this if you are compiling PCRE to run on a
59    system that uses EBCDIC code.
61    There is a discussion about character tables in the README file. The default is
62    not to use dftables so that that there is no problem when cross-compiling.
65    Release 7.0 19-Dec-06
66    ---------------------
68    This release has a new major number because there have been some internal
69    upheavals to facilitate the addition of new optimizations and other facilities,
70    and to make subsequent maintenance and extension easier. Compilation is likely
71    to be a bit slower, but there should be no major effect on runtime performance.
72    Previously compiled patterns are NOT upwards compatible with this release. If
73    you have saved compiled patterns from a previous release, you will have to
74    re-compile them. Important changes that are visible to users are:
76    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
77       some more scripts.
79    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
80       sequence as a newline.
82    3. The \R escape matches a single Unicode newline sequence as a single unit.
84    4. New features that will appear in Perl 5.10 are now in PCRE. These include
85       alternative Perl syntax for named parentheses, and Perl syntax for
86       recursion.
88    5. The C++ wrapper interface has been extended by the addition of a
89       QuoteMeta function and the ability to allow copy construction and
90       assignment.
92    For a complete list of changes, see the ChangeLog file.
95    Release 6.7 04-Jul-06
96    ---------------------
98    The main additions to this release are the ability to use the same name for
99    multiple sets of parentheses, and support for CRLF line endings in both the
100    library and pcregrep (and in pcretest for testing).
102    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
103    significantly reduced for certain subject strings.
106    Release 6.5 01-Feb-06
107    ---------------------
109    Important changes in this release:
111    1. A number of new features have been added to pcregrep.
113    2. The Unicode property tables have been updated to Unicode 4.1.0, and the
114       supported properties have been extended with script names such as "Arabic",
115       and the derived properties "Any" and "L&". This has necessitated a change to
116       the interal format of compiled patterns. Any saved compiled patterns that
117       use \p or \P must be recompiled.
119    3. The specification of recursion in patterns has been changed so that all
120       recursive subpatterns are automatically treated as atomic groups. Thus, for
121       example, (?R) is treated as if it were (?>(?R)). This is necessary because
122       otherwise there are situations where recursion does not work.
124    See the ChangeLog for a complete list of changes, which include a number of bug
125    fixes and tidies.
128  Release 6.0 07-Jun-05  Release 6.0 07-Jun-05
129  ---------------------  ---------------------

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