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revision 87 by nigel, Sat Feb 24 21:41:21 2007 UTC revision 508 by ph10, Fri Mar 19 10:26:03 2010 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
3    
4    Release 8.02 19-Mar-2010
5    ------------------------
6    
7    Another bug-fix release.
8    
9    
10    Release 8.01 19-Jan-2010
11    ------------------------
12    
13    This is a bug-fix release. Several bugs in the code itself and some bugs and
14    infelicities in the build system have been fixed.
15    
16    
17    Release 8.00 19-Oct-09
18    ----------------------
19    
20    Bugs have been fixed in the library and in pcregrep. There are also some
21    enhancements. Restrictions on patterns used for partial matching have been
22    removed, extra information is given for partial matches, the partial matching
23    process has been improved, and an option to make a partial match override a
24    full match is available. The "study" process has been enhanced by finding a
25    lower bound matching length. Groups with duplicate numbers may now have
26    duplicated names without the use of PCRE_DUPNAMES. However, they may not have
27    different names. The documentation has been revised to reflect these changes.
28    The version number has been expanded to 3 digits as it is clear that the rate
29    of change is not slowing down.
30    
31    
32    Release 7.9 11-Apr-09
33    ---------------------
34    
35    Mostly bugfixes and tidies with just a couple of minor functional additions.
36    
37    
38    Release 7.8 05-Sep-08
39    ---------------------
40    
41    More bug fixes, plus a performance improvement in Unicode character property
42    lookup.
43    
44    
45    Release 7.7 07-May-08
46    ---------------------
47    
48    This is once again mainly a bug-fix release, but there are a couple of new
49    features.
50    
51    
52    Release 7.6 28-Jan-08
53    ---------------------
54    
55    The main reason for having this release so soon after 7.5 is because it fixes a
56    potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
57    addition, the CMake configuration files have been brought up to date.
58    
59    
60    Release 7.5 10-Jan-08
61    ---------------------
62    
63    This is mainly a bug-fix release. However the ability to link pcregrep with
64    libz or libbz2 and the ability to link pcretest with libreadline have been
65    added. Also the --line-offsets and --file-offsets options were added to
66    pcregrep.
67    
68    
69    Release 7.4 21-Sep-07
70    ---------------------
71    
72    The only change of specification is the addition of options to control whether
73    \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
74    Otherwise, the changes are bug fixes and a refactoring to reduce the number of
75    relocations needed in a shared library. There have also been some documentation
76    updates, in particular, some more information about using CMake to build PCRE
77    has been added to the NON-UNIX-USE file.
78    
79    
80    Release 7.3 28-Aug-07
81    ---------------------
82    
83    Most changes are bug fixes. Some that are not:
84    
85    1. There is some support for Perl 5.10's experimental "backtracking control
86       verbs" such as (*PRUNE).
87    
88    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
89       restrictive in the strings it accepts.
90    
91    3. Checking for potential integer overflow has been made more dynamic, and as a
92       consequence there is no longer a hard limit on the size of a subpattern that
93       has a limited repeat count.
94    
95    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
96       no longer advance by two characters instead of one when an unanchored match
97       fails at CRLF if there are explicit CR or LF matches within the pattern.
98       This gets rid of some anomalous effects that previously occurred.
99    
100    5. Some PCRE-specific settings for varying the newline options at the start of
101       a pattern have been added.
102    
103    
104    Release 7.2 19-Jun-07
105    ---------------------
106    
107    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
108    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
109    and \V).
110    
111    Correction to the notes for 7.1: the note about shared libraries for Windows is
112    wrong. Previously, three libraries were built, but each could function
113    independently. For example, the pcreposix library also included all the
114    functions from the basic pcre library. The change is that the three libraries
115    are no longer independent. They are like the Unix libraries. To use the
116    pcreposix functions, for example, you need to link with both the pcreposix and
117    the basic pcre library.
118    
119    Some more features from Perl 5.10 have been added:
120    
121      (?-n) and (?+n) relative references for recursion and subroutines.
122    
123      (?(-n) and (?(+n) relative references as conditions.
124    
125      \k{name} and \g{name} are synonyms for \k<name>.
126    
127      \K to reset the start of the matched string; for example, (foo)\Kbar
128      matches bar preceded by foo, but only sets bar as the matched string.
129    
130      (?| introduces a group where the capturing parentheses in each alternative
131      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
132      parentheses number 1 in both cases.
133    
134      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
135    
136    
137    Release 7.1 24-Apr-07
138    ---------------------
139    
140    There is only one new feature in this release: a linebreak setting of
141    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
142    recognizes only CRLF, CR, and LF as linebreaks.
143    
144    A few bugs are fixed (see ChangeLog for details), but the major change is a
145    complete re-implementation of the build system. This now has full Autotools
146    support and so is now "standard" in some sense. It should help with compiling
147    PCRE in a wide variety of environments.
148    
149    NOTE: when building shared libraries for Windows, three dlls are now built,
150    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
151    included in a single dll.
152    
153    Another important change is that the dftables auxiliary program is no longer
154    compiled and run at "make" time by default. Instead, a default set of character
155    tables (assuming ASCII coding) is used. If you want to use dftables to generate
156    the character tables as previously, add --enable-rebuild-chartables to the
157    "configure" command. You must do this if you are compiling PCRE to run on a
158    system that uses EBCDIC code.
159    
160    There is a discussion about character tables in the README file. The default is
161    not to use dftables so that that there is no problem when cross-compiling.
162    
163    
164    Release 7.0 19-Dec-06
165    ---------------------
166    
167    This release has a new major number because there have been some internal
168    upheavals to facilitate the addition of new optimizations and other facilities,
169    and to make subsequent maintenance and extension easier. Compilation is likely
170    to be a bit slower, but there should be no major effect on runtime performance.
171    Previously compiled patterns are NOT upwards compatible with this release. If
172    you have saved compiled patterns from a previous release, you will have to
173    re-compile them. Important changes that are visible to users are:
174    
175    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
176       some more scripts.
177    
178    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
179       sequence as a newline.
180    
181    3. The \R escape matches a single Unicode newline sequence as a single unit.
182    
183    4. New features that will appear in Perl 5.10 are now in PCRE. These include
184       alternative Perl syntax for named parentheses, and Perl syntax for
185       recursion.
186    
187    5. The C++ wrapper interface has been extended by the addition of a
188       QuoteMeta function and the ability to allow copy construction and
189       assignment.
190    
191    For a complete list of changes, see the ChangeLog file.
192    
193    
194    Release 6.7 04-Jul-06
195    ---------------------
196    
197    The main additions to this release are the ability to use the same name for
198    multiple sets of parentheses, and support for CRLF line endings in both the
199    library and pcregrep (and in pcretest for testing).
200    
201    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
202    significantly reduced for certain subject strings.
203    
204    
205  Release 6.5 01-Feb-06  Release 6.5 01-Feb-06
206  ---------------------  ---------------------
207    

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