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revision 75 by nigel, Sat Feb 24 21:40:37 2007 UTC revision 242 by ph10, Thu Sep 13 09:20:12 2007 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
3    
4    
5    Release 7.4 13-Sep-07
6    ---------------------
7    
8    The only change of specification is the addition of options to control whether
9    \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
10    Otherwise, the changes are bug fixes and a refactoring to reduce the number of
11    relocations needed in a shared library.
12    
13    
14    Release 7.3 28-Aug-07
15    ---------------------
16    
17    Most changes are bug fixes. Some that are not:
18    
19    1. There is some support for Perl 5.10's experimental "backtracking control
20       verbs" such as (*PRUNE).
21    
22    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
23       restrictive in the strings it accepts.
24    
25    3. Checking for potential integer overflow has been made more dynamic, and as a
26       consequence there is no longer a hard limit on the size of a subpattern that
27       has a limited repeat count.
28    
29    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
30       no longer advance by two characters instead of one when an unanchored match
31       fails at CRLF if there are explicit CR or LF matches within the pattern.
32       This gets rid of some anomalous effects that previously occurred.
33    
34    5. Some PCRE-specific settings for varying the newline options at the start of
35       a pattern have been added.
36    
37    
38    Release 7.2 19-Jun-07
39    ---------------------
40    
41    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
42    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
43    and \V).
44    
45    Correction to the notes for 7.1: the note about shared libraries for Windows is
46    wrong. Previously, three libraries were built, but each could function
47    independently. For example, the pcreposix library also included all the
48    functions from the basic pcre library. The change is that the three libraries
49    are no longer independent. They are like the Unix libraries. To use the
50    pcreposix functions, for example, you need to link with both the pcreposix and
51    the basic pcre library.
52    
53    Some more features from Perl 5.10 have been added:
54    
55      (?-n) and (?+n) relative references for recursion and subroutines.
56    
57      (?(-n) and (?(+n) relative references as conditions.
58    
59      \k{name} and \g{name} are synonyms for \k<name>.
60    
61      \K to reset the start of the matched string; for example, (foo)\Kbar
62      matches bar preceded by foo, but only sets bar as the matched string.
63    
64      (?| introduces a group where the capturing parentheses in each alternative
65      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
66      parentheses number 1 in both cases.
67    
68      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
69    
70    
71    Release 7.1 24-Apr-07
72    ---------------------
73    
74    There is only one new feature in this release: a linebreak setting of
75    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
76    recognizes only CRLF, CR, and LF as linebreaks.
77    
78    A few bugs are fixed (see ChangeLog for details), but the major change is a
79    complete re-implementation of the build system. This now has full Autotools
80    support and so is now "standard" in some sense. It should help with compiling
81    PCRE in a wide variety of environments.
82    
83    NOTE: when building shared libraries for Windows, three dlls are now built,
84    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
85    included in a single dll.
86    
87    Another important change is that the dftables auxiliary program is no longer
88    compiled and run at "make" time by default. Instead, a default set of character
89    tables (assuming ASCII coding) is used. If you want to use dftables to generate
90    the character tables as previously, add --enable-rebuild-chartables to the
91    "configure" command. You must do this if you are compiling PCRE to run on a
92    system that uses EBCDIC code.
93    
94    There is a discussion about character tables in the README file. The default is
95    not to use dftables so that that there is no problem when cross-compiling.
96    
97    
98    Release 7.0 19-Dec-06
99    ---------------------
100    
101    This release has a new major number because there have been some internal
102    upheavals to facilitate the addition of new optimizations and other facilities,
103    and to make subsequent maintenance and extension easier. Compilation is likely
104    to be a bit slower, but there should be no major effect on runtime performance.
105    Previously compiled patterns are NOT upwards compatible with this release. If
106    you have saved compiled patterns from a previous release, you will have to
107    re-compile them. Important changes that are visible to users are:
108    
109    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
110       some more scripts.
111    
112    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
113       sequence as a newline.
114    
115    3. The \R escape matches a single Unicode newline sequence as a single unit.
116    
117    4. New features that will appear in Perl 5.10 are now in PCRE. These include
118       alternative Perl syntax for named parentheses, and Perl syntax for
119       recursion.
120    
121    5. The C++ wrapper interface has been extended by the addition of a
122       QuoteMeta function and the ability to allow copy construction and
123       assignment.
124    
125    For a complete list of changes, see the ChangeLog file.
126    
127    
128    Release 6.7 04-Jul-06
129    ---------------------
130    
131    The main additions to this release are the ability to use the same name for
132    multiple sets of parentheses, and support for CRLF line endings in both the
133    library and pcregrep (and in pcretest for testing).
134    
135    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
136    significantly reduced for certain subject strings.
137    
138    
139    Release 6.5 01-Feb-06
140    ---------------------
141    
142    Important changes in this release:
143    
144    1. A number of new features have been added to pcregrep.
145    
146    2. The Unicode property tables have been updated to Unicode 4.1.0, and the
147       supported properties have been extended with script names such as "Arabic",
148       and the derived properties "Any" and "L&". This has necessitated a change to
149       the interal format of compiled patterns. Any saved compiled patterns that
150       use \p or \P must be recompiled.
151    
152    3. The specification of recursion in patterns has been changed so that all
153       recursive subpatterns are automatically treated as atomic groups. Thus, for
154       example, (?R) is treated as if it were (?>(?R)). This is necessary because
155       otherwise there are situations where recursion does not work.
156    
157    See the ChangeLog for a complete list of changes, which include a number of bug
158    fixes and tidies.
159    
160    
161    Release 6.0 07-Jun-05
162    ---------------------
163    
164    The release number has been increased to 6.0 because of the addition of several
165    major new pieces of functionality.
166    
167    A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
168    algorithm, has been added. This has a number of advantages for certain cases,
169    though it does run more slowly, and lacks the ability to capture substrings. On
170    the other hand, it does find all matches, not just the first, and it works
171    better for partial matching. The pcrematching man page discusses the
172    differences.
173    
174    The pcretest program has been enhanced so that it can make use of the new
175    pcre_dfa_exec() matching function and the extra features it provides.
176    
177    The distribution now includes a C++ wrapper library. This is built
178    automatically if a C++ compiler is found. The pcrecpp man page discusses this
179    interface.
180    
181    The code itself has been re-organized into many more files, one for each
182    function, so it no longer requires everything to be linked in when static
183    linkage is used. As a consequence, some internal functions have had to have
184    their names exposed. These functions all have names starting with _pcre_. They
185    are undocumented, and are not intended for use by outside callers.
186    
187    The pcregrep program has been enhanced with new functionality such as
188    multiline-matching and options for output more matching context. See the
189    ChangeLog for a complete list of changes to the library and the utility
190    programs.
191    
192    
193  Release 5.0 13-Sep-04  Release 5.0 13-Sep-04
194  ---------------------  ---------------------
195    

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