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revision 77 by nigel, Sat Feb 24 21:40:45 2007 UTC revision 172 by ph10, Tue Jun 5 10:40:13 2007 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
3    
4    
5    Release 7.2 30-Apr-07
6    ---------------------
7    
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).
10    
11    Correction to the notes for 7.1: the note about shared libraries for Windows is
12    wrong. Previously, three libraries were built, but each could function
13    independently. For example, the pcreposix library also included all the
14    functions from the basic pcre library. The change is that the three libraries
15    are no longer independent. They are like the Unix libraries. To use the
16    pcreposix functions, for example, you need to link with both the pcreposix and
17    the basic pcre library.
18    
19    Some more features from Perl 5.10 have been added:
20    
21      (?-n) and (?+n) relative references for recursion and subroutines.
22    
23      (Not sure if this one is actually in Perl 5.10)
24      (?(-n) and (?(+n) relative references as conditions.
25    
26      \K to reset the start of the matched string; for example, (foo)\Kbar
27      matches bar preceded by foo, but only sets bar as the matched string
28    
29    
30    Release 7.1 24-Apr-07
31    ---------------------
32    
33    There is only one new feature in this release: a linebreak setting of
34    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
35    recognizes only CRLF, CR, and LF as linebreaks.
36    
37    A few bugs are fixed (see ChangeLog for details), but the major change is a
38    complete re-implementation of the build system. This now has full Autotools
39    support and so is now "standard" in some sense. It should help with compiling
40    PCRE in a wide variety of environments.
41    
42    NOTE: when building shared libraries for Windows, three dlls are now built,
43    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
44    included in a single dll.
45    
46    Another important change is that the dftables auxiliary program is no longer
47    compiled and run at "make" time by default. Instead, a default set of character
48    tables (assuming ASCII coding) is used. If you want to use dftables to generate
49    the character tables as previously, add --enable-rebuild-chartables to the
50    "configure" command. You must do this if you are compiling PCRE to run on a
51    system that uses EBCDIC code.
52    
53    There is a discussion about character tables in the README file. The default is
54    not to use dftables so that that there is no problem when cross-compiling.
55    
56    
57    Release 7.0 19-Dec-06
58    ---------------------
59    
60    This release has a new major number because there have been some internal
61    upheavals to facilitate the addition of new optimizations and other facilities,
62    and to make subsequent maintenance and extension easier. Compilation is likely
63    to be a bit slower, but there should be no major effect on runtime performance.
64    Previously compiled patterns are NOT upwards compatible with this release. If
65    you have saved compiled patterns from a previous release, you will have to
66    re-compile them. Important changes that are visible to users are:
67    
68    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
69       some more scripts.
70    
71    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
72       sequence as a newline.
73    
74    3. The \R escape matches a single Unicode newline sequence as a single unit.
75    
76    4. New features that will appear in Perl 5.10 are now in PCRE. These include
77       alternative Perl syntax for named parentheses, and Perl syntax for
78       recursion.
79    
80    5. The C++ wrapper interface has been extended by the addition of a
81       QuoteMeta function and the ability to allow copy construction and
82       assignment.
83    
84    For a complete list of changes, see the ChangeLog file.
85    
86    
87    Release 6.7 04-Jul-06
88    ---------------------
89    
90    The main additions to this release are the ability to use the same name for
91    multiple sets of parentheses, and support for CRLF line endings in both the
92    library and pcregrep (and in pcretest for testing).
93    
94    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
95    significantly reduced for certain subject strings.
96    
97    
98    Release 6.5 01-Feb-06
99    ---------------------
100    
101    Important changes in this release:
102    
103    1. A number of new features have been added to pcregrep.
104    
105    2. The Unicode property tables have been updated to Unicode 4.1.0, and the
106       supported properties have been extended with script names such as "Arabic",
107       and the derived properties "Any" and "L&". This has necessitated a change to
108       the interal format of compiled patterns. Any saved compiled patterns that
109       use \p or \P must be recompiled.
110    
111    3. The specification of recursion in patterns has been changed so that all
112       recursive subpatterns are automatically treated as atomic groups. Thus, for
113       example, (?R) is treated as if it were (?>(?R)). This is necessary because
114       otherwise there are situations where recursion does not work.
115    
116    See the ChangeLog for a complete list of changes, which include a number of bug
117    fixes and tidies.
118    
119    
120  Release 6.0 07-Jun-05  Release 6.0 07-Jun-05
121  ---------------------  ---------------------
122    

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