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revision 73 by nigel, Sat Feb 24 21:40:30 2007 UTC revision 909 by ph10, Sat Feb 4 15:01:47 2012 UTC
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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
4    Release 8.30 04-February-2012
5    -----------------------------
7    Release 8.30 introduces a major new feature: support for 16-bit character
8    strings, compiled as a separate library. There are a few changes to the
9    8-bit library, in addition to some bug fixes.
11    . The pcre_info() function, which has been obsolete for over 10 years, has
12      been removed.
14    . When a compiled pattern was saved to a file and later reloaded on a host
15      with different endianness, PCRE used automatically to swap the bytes in some
16      of the data fields. With the advent of the 16-bit library, where more of this
17      swapping is needed, it is no longer done automatically. Instead, the bad
18      endianness is detected and a specific error is given. The user can then call
19      a new function called pcre_pattern_to_host_byte_order() (or an equivalent
20      16-bit function) to do the swap.
22    . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
23      code points and are now faulted. (They are the so-called "surrogates"
24      that are reserved for coding high values in UTF-16.)
27    Release 8.21 12-Dec-2011
28    ------------------------
30    This is almost entirely a bug-fix release. The only new feature is the ability
31    to obtain the size of the memory used by the JIT compiler.
34    Release 8.20 21-Oct-2011
35    ------------------------
37    The main change in this release is the inclusion of Zoltan Herczeg's
38    just-in-time compiler support, which can be accessed by building PCRE with
39    --enable-jit. Large performance benefits can be had in many situations. 8.20
40    also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
41    a number of infelicities and differences from Perl.
44    Release 8.13 16-Aug-2011
45    ------------------------
47    This is mainly a bug-fix release. There has been a lot of internal refactoring.
48    The Unicode tables have been updated. The only new feature in the library is
49    the passing of *MARK information to callouts. Some additions have been made to
50    pcretest to make testing easier and more comprehensive. There is a new option
51    for pcregrep to adjust its internal buffer size.
54    Release 8.12 15-Jan-2011
55    ------------------------
57    This release fixes some bugs in pcregrep, one of which caused the tests to fail
58    on 64-bit big-endian systems. There are no changes to the code of the library.
61    Release 8.11 10-Dec-2010
62    ------------------------
64    A number of bugs in the library and in pcregrep have been fixed. As always, see
65    ChangeLog for details. The following are the non-bug-fix changes:
67    . Added --match-limit and --recursion-limit to pcregrep.
69    . Added an optional parentheses number to the -o and --only-matching options
70      of pcregrep.
72    . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
73      \B.
75    . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
76      bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
78    . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
79      START_OPTIMIZE option, which is now allowed at compile time
82    Release 8.10 25-Jun-2010
83    ------------------------
85    There are two major additions: support for (*MARK) and friends, and the option
86    PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
87    opposites) so that they make use of Unicode properties. There are also a number
88    of lesser new features, and several bugs have been fixed. A new option,
89    --line-buffered, has been added to pcregrep, for use when it is connected to
90    pipes.
93    Release 8.02 19-Mar-2010
94    ------------------------
96    Another bug-fix release.
99    Release 8.01 19-Jan-2010
100    ------------------------
102    This is a bug-fix release. Several bugs in the code itself and some bugs and
103    infelicities in the build system have been fixed.
106    Release 8.00 19-Oct-09
107    ----------------------
109    Bugs have been fixed in the library and in pcregrep. There are also some
110    enhancements. Restrictions on patterns used for partial matching have been
111    removed, extra information is given for partial matches, the partial matching
112    process has been improved, and an option to make a partial match override a
113    full match is available. The "study" process has been enhanced by finding a
114    lower bound matching length. Groups with duplicate numbers may now have
115    duplicated names without the use of PCRE_DUPNAMES. However, they may not have
116    different names. The documentation has been revised to reflect these changes.
117    The version number has been expanded to 3 digits as it is clear that the rate
118    of change is not slowing down.
121    Release 7.9 11-Apr-09
122    ---------------------
124    Mostly bugfixes and tidies with just a couple of minor functional additions.
127    Release 7.8 05-Sep-08
128    ---------------------
130    More bug fixes, plus a performance improvement in Unicode character property
131    lookup.
134    Release 7.7 07-May-08
135    ---------------------
137    This is once again mainly a bug-fix release, but there are a couple of new
138    features.
141    Release 7.6 28-Jan-08
142    ---------------------
144    The main reason for having this release so soon after 7.5 is because it fixes a
145    potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
146    addition, the CMake configuration files have been brought up to date.
149    Release 7.5 10-Jan-08
150    ---------------------
152    This is mainly a bug-fix release. However the ability to link pcregrep with
153    libz or libbz2 and the ability to link pcretest with libreadline have been
154    added. Also the --line-offsets and --file-offsets options were added to
155    pcregrep.
158    Release 7.4 21-Sep-07
159    ---------------------
161    The only change of specification is the addition of options to control whether
162    \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
163    Otherwise, the changes are bug fixes and a refactoring to reduce the number of
164    relocations needed in a shared library. There have also been some documentation
165    updates, in particular, some more information about using CMake to build PCRE
166    has been added to the NON-UNIX-USE file.
169    Release 7.3 28-Aug-07
170    ---------------------
172    Most changes are bug fixes. Some that are not:
174    1. There is some support for Perl 5.10's experimental "backtracking control
175       verbs" such as (*PRUNE).
177    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
178       restrictive in the strings it accepts.
180    3. Checking for potential integer overflow has been made more dynamic, and as a
181       consequence there is no longer a hard limit on the size of a subpattern that
182       has a limited repeat count.
184    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
185       no longer advance by two characters instead of one when an unanchored match
186       fails at CRLF if there are explicit CR or LF matches within the pattern.
187       This gets rid of some anomalous effects that previously occurred.
189    5. Some PCRE-specific settings for varying the newline options at the start of
190       a pattern have been added.
193    Release 7.2 19-Jun-07
194    ---------------------
196    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
197    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
198    and \V).
200    Correction to the notes for 7.1: the note about shared libraries for Windows is
201    wrong. Previously, three libraries were built, but each could function
202    independently. For example, the pcreposix library also included all the
203    functions from the basic pcre library. The change is that the three libraries
204    are no longer independent. They are like the Unix libraries. To use the
205    pcreposix functions, for example, you need to link with both the pcreposix and
206    the basic pcre library.
208    Some more features from Perl 5.10 have been added:
210      (?-n) and (?+n) relative references for recursion and subroutines.
212      (?(-n) and (?(+n) relative references as conditions.
214      \k{name} and \g{name} are synonyms for \k<name>.
216      \K to reset the start of the matched string; for example, (foo)\Kbar
217      matches bar preceded by foo, but only sets bar as the matched string.
219      (?| introduces a group where the capturing parentheses in each alternative
220      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
221      parentheses number 1 in both cases.
223      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
226    Release 7.1 24-Apr-07
227    ---------------------
229    There is only one new feature in this release: a linebreak setting of
230    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
231    recognizes only CRLF, CR, and LF as linebreaks.
233    A few bugs are fixed (see ChangeLog for details), but the major change is a
234    complete re-implementation of the build system. This now has full Autotools
235    support and so is now "standard" in some sense. It should help with compiling
236    PCRE in a wide variety of environments.
238    NOTE: when building shared libraries for Windows, three dlls are now built,
239    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
240    included in a single dll.
242    Another important change is that the dftables auxiliary program is no longer
243    compiled and run at "make" time by default. Instead, a default set of character
244    tables (assuming ASCII coding) is used. If you want to use dftables to generate
245    the character tables as previously, add --enable-rebuild-chartables to the
246    "configure" command. You must do this if you are compiling PCRE to run on a
247    system that uses EBCDIC code.
249    There is a discussion about character tables in the README file. The default is
250    not to use dftables so that that there is no problem when cross-compiling.
253    Release 7.0 19-Dec-06
254    ---------------------
256    This release has a new major number because there have been some internal
257    upheavals to facilitate the addition of new optimizations and other facilities,
258    and to make subsequent maintenance and extension easier. Compilation is likely
259    to be a bit slower, but there should be no major effect on runtime performance.
260    Previously compiled patterns are NOT upwards compatible with this release. If
261    you have saved compiled patterns from a previous release, you will have to
262    re-compile them. Important changes that are visible to users are:
264    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
265       some more scripts.
267    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
268       sequence as a newline.
270    3. The \R escape matches a single Unicode newline sequence as a single unit.
272    4. New features that will appear in Perl 5.10 are now in PCRE. These include
273       alternative Perl syntax for named parentheses, and Perl syntax for
274       recursion.
276    5. The C++ wrapper interface has been extended by the addition of a
277       QuoteMeta function and the ability to allow copy construction and
278       assignment.
280    For a complete list of changes, see the ChangeLog file.
283    Release 6.7 04-Jul-06
284    ---------------------
286    The main additions to this release are the ability to use the same name for
287    multiple sets of parentheses, and support for CRLF line endings in both the
288    library and pcregrep (and in pcretest for testing).
290    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
291    significantly reduced for certain subject strings.
294    Release 6.5 01-Feb-06
295    ---------------------
297    Important changes in this release:
299    1. A number of new features have been added to pcregrep.
301    2. The Unicode property tables have been updated to Unicode 4.1.0, and the
302       supported properties have been extended with script names such as "Arabic",
303       and the derived properties "Any" and "L&". This has necessitated a change to
304       the interal format of compiled patterns. Any saved compiled patterns that
305       use \p or \P must be recompiled.
307    3. The specification of recursion in patterns has been changed so that all
308       recursive subpatterns are automatically treated as atomic groups. Thus, for
309       example, (?R) is treated as if it were (?>(?R)). This is necessary because
310       otherwise there are situations where recursion does not work.
312    See the ChangeLog for a complete list of changes, which include a number of bug
313    fixes and tidies.
316    Release 6.0 07-Jun-05
317    ---------------------
319    The release number has been increased to 6.0 because of the addition of several
320    major new pieces of functionality.
322    A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
323    algorithm, has been added. This has a number of advantages for certain cases,
324    though it does run more slowly, and lacks the ability to capture substrings. On
325    the other hand, it does find all matches, not just the first, and it works
326    better for partial matching. The pcrematching man page discusses the
327    differences.
329    The pcretest program has been enhanced so that it can make use of the new
330    pcre_dfa_exec() matching function and the extra features it provides.
332    The distribution now includes a C++ wrapper library. This is built
333    automatically if a C++ compiler is found. The pcrecpp man page discusses this
334    interface.
336    The code itself has been re-organized into many more files, one for each
337    function, so it no longer requires everything to be linked in when static
338    linkage is used. As a consequence, some internal functions have had to have
339    their names exposed. These functions all have names starting with _pcre_. They
340    are undocumented, and are not intended for use by outside callers.
342    The pcregrep program has been enhanced with new functionality such as
343    multiline-matching and options for output more matching context. See the
344    ChangeLog for a complete list of changes to the library and the utility
345    programs.
348    Release 5.0 13-Sep-04
349    ---------------------
351    The licence under which PCRE is released has been changed to the more
352    conventional "BSD" licence.
354    In the code, some bugs have been fixed, and there are also some major changes
355    in this release (which is why I've increased the number to 5.0). Some changes
356    are internal rearrangements, and some provide a number of new facilities. The
357    new features are:
359    1. There's an "automatic callout" feature that inserts callouts before every
360       item in the regex, and there's a new callout field that gives the position
361       in the pattern - useful for debugging and tracing.
363    2. The extra_data structure can now be used to pass in a set of character
364       tables at exec time. This is useful if compiled regex are saved and re-used
365       at a later time when the tables may not be at the same address. If the
366       default internal tables are used, the pointer saved with the compiled
367       pattern is now set to NULL, which means that you don't need to do anything
368       special unless you are using custom tables.
370    3. It is possible, with some restrictions on the content of the regex, to
371       request "partial" matching. A special return code is given if all of the
372       subject string matched part of the regex. This could be useful for testing
373       an input field as it is being typed.
375    4. There is now some optional support for Unicode character properties, which
376       means that the patterns items such as \p{Lu} and \X can now be used. Only
377       the general category properties are supported. If PCRE is compiled with this
378       support, an additional 90K data structure is include, which increases the
379       size of the library dramatically.
381    5. There is support for saving compiled patterns and re-using them later.
383    6. There is support for running regular expressions that were compiled on a
384       different host with the opposite endianness.
386    7. The pcretest program has been extended to accommodate the new features.
388    The main internal rearrangement is that sequences of literal characters are no
389    longer handled as strings. Instead, each character is handled on its own. This
390    makes some UTF-8 handling easier, and makes the support of partial matching
391    possible. Compiled patterns containing long literal strings will be larger as a
392    result of this change; I hope that performance will not be much affected.
395  Release 4.5 01-Dec-03  Release 4.5 01-Dec-03
396  ---------------------  ---------------------

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