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revision 77 by nigel, Sat Feb 24 21:40:45 2007 UTC revision 175 by ph10, Mon Jun 11 13:38:38 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      (?| introduces a group where the capturing parentheses in each alternative
30      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
31      parentheses number 1 in both cases.
32    
33    
34    Release 7.1 24-Apr-07
35    ---------------------
36    
37    There is only one new feature in this release: a linebreak setting of
38    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
39    recognizes only CRLF, CR, and LF as linebreaks.
40    
41    A few bugs are fixed (see ChangeLog for details), but the major change is a
42    complete re-implementation of the build system. This now has full Autotools
43    support and so is now "standard" in some sense. It should help with compiling
44    PCRE in a wide variety of environments.
45    
46    NOTE: when building shared libraries for Windows, three dlls are now built,
47    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
48    included in a single dll.
49    
50    Another important change is that the dftables auxiliary program is no longer
51    compiled and run at "make" time by default. Instead, a default set of character
52    tables (assuming ASCII coding) is used. If you want to use dftables to generate
53    the character tables as previously, add --enable-rebuild-chartables to the
54    "configure" command. You must do this if you are compiling PCRE to run on a
55    system that uses EBCDIC code.
56    
57    There is a discussion about character tables in the README file. The default is
58    not to use dftables so that that there is no problem when cross-compiling.
59    
60    
61    Release 7.0 19-Dec-06
62    ---------------------
63    
64    This release has a new major number because there have been some internal
65    upheavals to facilitate the addition of new optimizations and other facilities,
66    and to make subsequent maintenance and extension easier. Compilation is likely
67    to be a bit slower, but there should be no major effect on runtime performance.
68    Previously compiled patterns are NOT upwards compatible with this release. If
69    you have saved compiled patterns from a previous release, you will have to
70    re-compile them. Important changes that are visible to users are:
71    
72    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
73       some more scripts.
74    
75    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
76       sequence as a newline.
77    
78    3. The \R escape matches a single Unicode newline sequence as a single unit.
79    
80    4. New features that will appear in Perl 5.10 are now in PCRE. These include
81       alternative Perl syntax for named parentheses, and Perl syntax for
82       recursion.
83    
84    5. The C++ wrapper interface has been extended by the addition of a
85       QuoteMeta function and the ability to allow copy construction and
86       assignment.
87    
88    For a complete list of changes, see the ChangeLog file.
89    
90    
91    Release 6.7 04-Jul-06
92    ---------------------
93    
94    The main additions to this release are the ability to use the same name for
95    multiple sets of parentheses, and support for CRLF line endings in both the
96    library and pcregrep (and in pcretest for testing).
97    
98    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
99    significantly reduced for certain subject strings.
100    
101    
102    Release 6.5 01-Feb-06
103    ---------------------
104    
105    Important changes in this release:
106    
107    1. A number of new features have been added to pcregrep.
108    
109    2. The Unicode property tables have been updated to Unicode 4.1.0, and the
110       supported properties have been extended with script names such as "Arabic",
111       and the derived properties "Any" and "L&". This has necessitated a change to
112       the interal format of compiled patterns. Any saved compiled patterns that
113       use \p or \P must be recompiled.
114    
115    3. The specification of recursion in patterns has been changed so that all
116       recursive subpatterns are automatically treated as atomic groups. Thus, for
117       example, (?R) is treated as if it were (?>(?R)). This is necessary because
118       otherwise there are situations where recursion does not work.
119    
120    See the ChangeLog for a complete list of changes, which include a number of bug
121    fixes and tidies.
122    
123    
124  Release 6.0 07-Jun-05  Release 6.0 07-Jun-05
125  ---------------------  ---------------------
126    

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