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revision 73 by nigel, Sat Feb 24 21:40:30 2007 UTC revision 589 by ph10, Sat Jan 15 11:31:39 2011 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
4    Release 8.12 15-Jan-2011
5    ------------------------
7    This release fixes some bugs in pcregrep, one of which caused the tests to fail
8    on 64-bit big-endian systems. There are no changes to the code of the library.
11    Release 8.11 10-Dec-2010
12    ------------------------
14    A number of bugs in the library and in pcregrep have been fixed. As always, see
15    ChangeLog for details. The following are the non-bug-fix changes:
17    . Added --match-limit and --recursion-limit to pcregrep.
19    . Added an optional parentheses number to the -o and --only-matching options
20      of pcregrep.
22    . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
23      \B.
25    . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
26      bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
28    . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
29      START_OPTIMIZE option, which is now allowed at compile time
32    Release 8.10 25-Jun-2010
33    ------------------------
35    There are two major additions: support for (*MARK) and friends, and the option
36    PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
37    opposites) so that they make use of Unicode properties. There are also a number
38    of lesser new features, and several bugs have been fixed. A new option,
39    --line-buffered, has been added to pcregrep, for use when it is connected to
40    pipes.
43    Release 8.02 19-Mar-2010
44    ------------------------
46    Another bug-fix release.
49    Release 8.01 19-Jan-2010
50    ------------------------
52    This is a bug-fix release. Several bugs in the code itself and some bugs and
53    infelicities in the build system have been fixed.
56    Release 8.00 19-Oct-09
57    ----------------------
59    Bugs have been fixed in the library and in pcregrep. There are also some
60    enhancements. Restrictions on patterns used for partial matching have been
61    removed, extra information is given for partial matches, the partial matching
62    process has been improved, and an option to make a partial match override a
63    full match is available. The "study" process has been enhanced by finding a
64    lower bound matching length. Groups with duplicate numbers may now have
65    duplicated names without the use of PCRE_DUPNAMES. However, they may not have
66    different names. The documentation has been revised to reflect these changes.
67    The version number has been expanded to 3 digits as it is clear that the rate
68    of change is not slowing down.
71    Release 7.9 11-Apr-09
72    ---------------------
74    Mostly bugfixes and tidies with just a couple of minor functional additions.
77    Release 7.8 05-Sep-08
78    ---------------------
80    More bug fixes, plus a performance improvement in Unicode character property
81    lookup.
84    Release 7.7 07-May-08
85    ---------------------
87    This is once again mainly a bug-fix release, but there are a couple of new
88    features.
91    Release 7.6 28-Jan-08
92    ---------------------
94    The main reason for having this release so soon after 7.5 is because it fixes a
95    potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
96    addition, the CMake configuration files have been brought up to date.
99    Release 7.5 10-Jan-08
100    ---------------------
102    This is mainly a bug-fix release. However the ability to link pcregrep with
103    libz or libbz2 and the ability to link pcretest with libreadline have been
104    added. Also the --line-offsets and --file-offsets options were added to
105    pcregrep.
108    Release 7.4 21-Sep-07
109    ---------------------
111    The only change of specification is the addition of options to control whether
112    \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
113    Otherwise, the changes are bug fixes and a refactoring to reduce the number of
114    relocations needed in a shared library. There have also been some documentation
115    updates, in particular, some more information about using CMake to build PCRE
116    has been added to the NON-UNIX-USE file.
119    Release 7.3 28-Aug-07
120    ---------------------
122    Most changes are bug fixes. Some that are not:
124    1. There is some support for Perl 5.10's experimental "backtracking control
125       verbs" such as (*PRUNE).
127    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
128       restrictive in the strings it accepts.
130    3. Checking for potential integer overflow has been made more dynamic, and as a
131       consequence there is no longer a hard limit on the size of a subpattern that
132       has a limited repeat count.
134    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
135       no longer advance by two characters instead of one when an unanchored match
136       fails at CRLF if there are explicit CR or LF matches within the pattern.
137       This gets rid of some anomalous effects that previously occurred.
139    5. Some PCRE-specific settings for varying the newline options at the start of
140       a pattern have been added.
143    Release 7.2 19-Jun-07
144    ---------------------
146    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
147    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
148    and \V).
150    Correction to the notes for 7.1: the note about shared libraries for Windows is
151    wrong. Previously, three libraries were built, but each could function
152    independently. For example, the pcreposix library also included all the
153    functions from the basic pcre library. The change is that the three libraries
154    are no longer independent. They are like the Unix libraries. To use the
155    pcreposix functions, for example, you need to link with both the pcreposix and
156    the basic pcre library.
158    Some more features from Perl 5.10 have been added:
160      (?-n) and (?+n) relative references for recursion and subroutines.
162      (?(-n) and (?(+n) relative references as conditions.
164      \k{name} and \g{name} are synonyms for \k<name>.
166      \K to reset the start of the matched string; for example, (foo)\Kbar
167      matches bar preceded by foo, but only sets bar as the matched string.
169      (?| introduces a group where the capturing parentheses in each alternative
170      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
171      parentheses number 1 in both cases.
173      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
176    Release 7.1 24-Apr-07
177    ---------------------
179    There is only one new feature in this release: a linebreak setting of
180    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
181    recognizes only CRLF, CR, and LF as linebreaks.
183    A few bugs are fixed (see ChangeLog for details), but the major change is a
184    complete re-implementation of the build system. This now has full Autotools
185    support and so is now "standard" in some sense. It should help with compiling
186    PCRE in a wide variety of environments.
188    NOTE: when building shared libraries for Windows, three dlls are now built,
189    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
190    included in a single dll.
192    Another important change is that the dftables auxiliary program is no longer
193    compiled and run at "make" time by default. Instead, a default set of character
194    tables (assuming ASCII coding) is used. If you want to use dftables to generate
195    the character tables as previously, add --enable-rebuild-chartables to the
196    "configure" command. You must do this if you are compiling PCRE to run on a
197    system that uses EBCDIC code.
199    There is a discussion about character tables in the README file. The default is
200    not to use dftables so that that there is no problem when cross-compiling.
203    Release 7.0 19-Dec-06
204    ---------------------
206    This release has a new major number because there have been some internal
207    upheavals to facilitate the addition of new optimizations and other facilities,
208    and to make subsequent maintenance and extension easier. Compilation is likely
209    to be a bit slower, but there should be no major effect on runtime performance.
210    Previously compiled patterns are NOT upwards compatible with this release. If
211    you have saved compiled patterns from a previous release, you will have to
212    re-compile them. Important changes that are visible to users are:
214    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
215       some more scripts.
217    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
218       sequence as a newline.
220    3. The \R escape matches a single Unicode newline sequence as a single unit.
222    4. New features that will appear in Perl 5.10 are now in PCRE. These include
223       alternative Perl syntax for named parentheses, and Perl syntax for
224       recursion.
226    5. The C++ wrapper interface has been extended by the addition of a
227       QuoteMeta function and the ability to allow copy construction and
228       assignment.
230    For a complete list of changes, see the ChangeLog file.
233    Release 6.7 04-Jul-06
234    ---------------------
236    The main additions to this release are the ability to use the same name for
237    multiple sets of parentheses, and support for CRLF line endings in both the
238    library and pcregrep (and in pcretest for testing).
240    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
241    significantly reduced for certain subject strings.
244    Release 6.5 01-Feb-06
245    ---------------------
247    Important changes in this release:
249    1. A number of new features have been added to pcregrep.
251    2. The Unicode property tables have been updated to Unicode 4.1.0, and the
252       supported properties have been extended with script names such as "Arabic",
253       and the derived properties "Any" and "L&". This has necessitated a change to
254       the interal format of compiled patterns. Any saved compiled patterns that
255       use \p or \P must be recompiled.
257    3. The specification of recursion in patterns has been changed so that all
258       recursive subpatterns are automatically treated as atomic groups. Thus, for
259       example, (?R) is treated as if it were (?>(?R)). This is necessary because
260       otherwise there are situations where recursion does not work.
262    See the ChangeLog for a complete list of changes, which include a number of bug
263    fixes and tidies.
266    Release 6.0 07-Jun-05
267    ---------------------
269    The release number has been increased to 6.0 because of the addition of several
270    major new pieces of functionality.
272    A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
273    algorithm, has been added. This has a number of advantages for certain cases,
274    though it does run more slowly, and lacks the ability to capture substrings. On
275    the other hand, it does find all matches, not just the first, and it works
276    better for partial matching. The pcrematching man page discusses the
277    differences.
279    The pcretest program has been enhanced so that it can make use of the new
280    pcre_dfa_exec() matching function and the extra features it provides.
282    The distribution now includes a C++ wrapper library. This is built
283    automatically if a C++ compiler is found. The pcrecpp man page discusses this
284    interface.
286    The code itself has been re-organized into many more files, one for each
287    function, so it no longer requires everything to be linked in when static
288    linkage is used. As a consequence, some internal functions have had to have
289    their names exposed. These functions all have names starting with _pcre_. They
290    are undocumented, and are not intended for use by outside callers.
292    The pcregrep program has been enhanced with new functionality such as
293    multiline-matching and options for output more matching context. See the
294    ChangeLog for a complete list of changes to the library and the utility
295    programs.
298    Release 5.0 13-Sep-04
299    ---------------------
301    The licence under which PCRE is released has been changed to the more
302    conventional "BSD" licence.
304    In the code, some bugs have been fixed, and there are also some major changes
305    in this release (which is why I've increased the number to 5.0). Some changes
306    are internal rearrangements, and some provide a number of new facilities. The
307    new features are:
309    1. There's an "automatic callout" feature that inserts callouts before every
310       item in the regex, and there's a new callout field that gives the position
311       in the pattern - useful for debugging and tracing.
313    2. The extra_data structure can now be used to pass in a set of character
314       tables at exec time. This is useful if compiled regex are saved and re-used
315       at a later time when the tables may not be at the same address. If the
316       default internal tables are used, the pointer saved with the compiled
317       pattern is now set to NULL, which means that you don't need to do anything
318       special unless you are using custom tables.
320    3. It is possible, with some restrictions on the content of the regex, to
321       request "partial" matching. A special return code is given if all of the
322       subject string matched part of the regex. This could be useful for testing
323       an input field as it is being typed.
325    4. There is now some optional support for Unicode character properties, which
326       means that the patterns items such as \p{Lu} and \X can now be used. Only
327       the general category properties are supported. If PCRE is compiled with this
328       support, an additional 90K data structure is include, which increases the
329       size of the library dramatically.
331    5. There is support for saving compiled patterns and re-using them later.
333    6. There is support for running regular expressions that were compiled on a
334       different host with the opposite endianness.
336    7. The pcretest program has been extended to accommodate the new features.
338    The main internal rearrangement is that sequences of literal characters are no
339    longer handled as strings. Instead, each character is handled on its own. This
340    makes some UTF-8 handling easier, and makes the support of partial matching
341    possible. Compiled patterns containing long literal strings will be larger as a
342    result of this change; I hope that performance will not be much affected.
345  Release 4.5 01-Dec-03  Release 4.5 01-Dec-03
346  ---------------------  ---------------------

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