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revision 75 by nigel, Sat Feb 24 21:40:37 2007 UTC revision 128 by ph10, Tue Mar 20 11:46:50 2007 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
3    
4    
5    Release 7.1 20-Mar-07
6    ---------------------
7    
8    There are no new features in this release. A few bugs are fixed (see ChangeLog
9    for details), but the major change is a complete re-implementation of the build
10    system. This now has full Autotools support and so is now "standard" in some
11    sense. It should help with compiling PCRE in a wide variety of environments.
12    
13    An important change is that the dftables auxiliary program is no longer
14    compiled and run at "make" time by default. Instead, a default set of character
15    tables (assuming ASCII coding) is used. If you want to use dftables to generate
16    the character tables as previously, add --enable-rebuild-chartables to the
17    "configure" command. You must do this if you are compiling PCRE to run on a
18    system that uses EBCDIC code.
19    
20    There is a discussion about character tables in the README file. The default is
21    not to use dftables so that that there is no problem when cross-compiling.
22    
23    
24    Release 7.0 19-Dec-06
25    ---------------------
26    
27    This release has a new major number because there have been some internal
28    upheavals to facilitate the addition of new optimizations and other facilities,
29    and to make subsequent maintenance and extension easier. Compilation is likely
30    to be a bit slower, but there should be no major effect on runtime performance.
31    Previously compiled patterns are NOT upwards compatible with this release. If
32    you have saved compiled patterns from a previous release, you will have to
33    re-compile them. Important changes that are visible to users are:
34    
35    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
36       some more scripts.
37    
38    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
39       sequence as a newline.
40    
41    3. The \R escape matches a single Unicode newline sequence as a single unit.
42    
43    4. New features that will appear in Perl 5.10 are now in PCRE. These include
44       alternative Perl syntax for named parentheses, and Perl syntax for
45       recursion.
46    
47    5. The C++ wrapper interface has been extended by the addition of a
48       QuoteMeta function and the ability to allow copy construction and
49       assignment.
50    
51    For a complete list of changes, see the ChangeLog file.
52    
53    
54    Release 6.7 04-Jul-06
55    ---------------------
56    
57    The main additions to this release are the ability to use the same name for
58    multiple sets of parentheses, and support for CRLF line endings in both the
59    library and pcregrep (and in pcretest for testing).
60    
61    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
62    significantly reduced for certain subject strings.
63    
64    
65    Release 6.5 01-Feb-06
66    ---------------------
67    
68    Important changes in this release:
69    
70    1. A number of new features have been added to pcregrep.
71    
72    2. The Unicode property tables have been updated to Unicode 4.1.0, and the
73       supported properties have been extended with script names such as "Arabic",
74       and the derived properties "Any" and "L&". This has necessitated a change to
75       the interal format of compiled patterns. Any saved compiled patterns that
76       use \p or \P must be recompiled.
77    
78    3. The specification of recursion in patterns has been changed so that all
79       recursive subpatterns are automatically treated as atomic groups. Thus, for
80       example, (?R) is treated as if it were (?>(?R)). This is necessary because
81       otherwise there are situations where recursion does not work.
82    
83    See the ChangeLog for a complete list of changes, which include a number of bug
84    fixes and tidies.
85    
86    
87    Release 6.0 07-Jun-05
88    ---------------------
89    
90    The release number has been increased to 6.0 because of the addition of several
91    major new pieces of functionality.
92    
93    A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
94    algorithm, has been added. This has a number of advantages for certain cases,
95    though it does run more slowly, and lacks the ability to capture substrings. On
96    the other hand, it does find all matches, not just the first, and it works
97    better for partial matching. The pcrematching man page discusses the
98    differences.
99    
100    The pcretest program has been enhanced so that it can make use of the new
101    pcre_dfa_exec() matching function and the extra features it provides.
102    
103    The distribution now includes a C++ wrapper library. This is built
104    automatically if a C++ compiler is found. The pcrecpp man page discusses this
105    interface.
106    
107    The code itself has been re-organized into many more files, one for each
108    function, so it no longer requires everything to be linked in when static
109    linkage is used. As a consequence, some internal functions have had to have
110    their names exposed. These functions all have names starting with _pcre_. They
111    are undocumented, and are not intended for use by outside callers.
112    
113    The pcregrep program has been enhanced with new functionality such as
114    multiline-matching and options for output more matching context. See the
115    ChangeLog for a complete list of changes to the library and the utility
116    programs.
117    
118    
119  Release 5.0 13-Sep-04  Release 5.0 13-Sep-04
120  ---------------------  ---------------------
121    

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