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revision 87 by nigel, Sat Feb 24 21:41:21 2007 UTC revision 226 by ph10, Tue Aug 21 11:46:08 2007 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
3    
4    
5    Release 7.3 20-Aug-07
6    ---------------------
7    
8    Most changes are bug fixes. Some that are not:
9    
10    1. There is some support for Perl 5.10's experimental "backtracking control
11       verbs" such as (*PRUNE).
12    
13    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
14       restrictive in the strings it accepts.
15    
16    3. Checking for potential integer overflow has been made more dynamic, and as a
17       consequence there is no longer a hard limit on the size of a subpattern that
18       has a limited repeat count.
19    
20    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
21       no longer advance by two characters instead of one when an unanchored match
22       fails at CRLF if there are explicit CR or LF matches within the pattern.
23       This gets rid of some anomalous effects that previously occurred.
24    
25    
26    Release 7.2 19-Jun-07
27    ---------------------
28    
29    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
30    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
31    and \V).
32    
33    Correction to the notes for 7.1: the note about shared libraries for Windows is
34    wrong. Previously, three libraries were built, but each could function
35    independently. For example, the pcreposix library also included all the
36    functions from the basic pcre library. The change is that the three libraries
37    are no longer independent. They are like the Unix libraries. To use the
38    pcreposix functions, for example, you need to link with both the pcreposix and
39    the basic pcre library.
40    
41    Some more features from Perl 5.10 have been added:
42    
43      (?-n) and (?+n) relative references for recursion and subroutines.
44    
45      (?(-n) and (?(+n) relative references as conditions.
46    
47      \k{name} and \g{name} are synonyms for \k<name>.
48    
49      \K to reset the start of the matched string; for example, (foo)\Kbar
50      matches bar preceded by foo, but only sets bar as the matched string.
51    
52      (?| introduces a group where the capturing parentheses in each alternative
53      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
54      parentheses number 1 in both cases.
55    
56      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
57    
58    
59    Release 7.1 24-Apr-07
60    ---------------------
61    
62    There is only one new feature in this release: a linebreak setting of
63    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
64    recognizes only CRLF, CR, and LF as linebreaks.
65    
66    A few bugs are fixed (see ChangeLog for details), but the major change is a
67    complete re-implementation of the build system. This now has full Autotools
68    support and so is now "standard" in some sense. It should help with compiling
69    PCRE in a wide variety of environments.
70    
71    NOTE: when building shared libraries for Windows, three dlls are now built,
72    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
73    included in a single dll.
74    
75    Another important change is that the dftables auxiliary program is no longer
76    compiled and run at "make" time by default. Instead, a default set of character
77    tables (assuming ASCII coding) is used. If you want to use dftables to generate
78    the character tables as previously, add --enable-rebuild-chartables to the
79    "configure" command. You must do this if you are compiling PCRE to run on a
80    system that uses EBCDIC code.
81    
82    There is a discussion about character tables in the README file. The default is
83    not to use dftables so that that there is no problem when cross-compiling.
84    
85    
86    Release 7.0 19-Dec-06
87    ---------------------
88    
89    This release has a new major number because there have been some internal
90    upheavals to facilitate the addition of new optimizations and other facilities,
91    and to make subsequent maintenance and extension easier. Compilation is likely
92    to be a bit slower, but there should be no major effect on runtime performance.
93    Previously compiled patterns are NOT upwards compatible with this release. If
94    you have saved compiled patterns from a previous release, you will have to
95    re-compile them. Important changes that are visible to users are:
96    
97    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
98       some more scripts.
99    
100    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
101       sequence as a newline.
102    
103    3. The \R escape matches a single Unicode newline sequence as a single unit.
104    
105    4. New features that will appear in Perl 5.10 are now in PCRE. These include
106       alternative Perl syntax for named parentheses, and Perl syntax for
107       recursion.
108    
109    5. The C++ wrapper interface has been extended by the addition of a
110       QuoteMeta function and the ability to allow copy construction and
111       assignment.
112    
113    For a complete list of changes, see the ChangeLog file.
114    
115    
116    Release 6.7 04-Jul-06
117    ---------------------
118    
119    The main additions to this release are the ability to use the same name for
120    multiple sets of parentheses, and support for CRLF line endings in both the
121    library and pcregrep (and in pcretest for testing).
122    
123    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
124    significantly reduced for certain subject strings.
125    
126    
127  Release 6.5 01-Feb-06  Release 6.5 01-Feb-06
128  ---------------------  ---------------------
129    

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