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1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
3    
4    Release 8.33 28-April-2013
5    --------------------------
6    
7    A number of bugs are fixed, and some performance improvements have been made.
8    There are also some new features, of which these are the most important:
9    
10    .  The behaviour of the backtracking verbs has been rationalized and
11       documented in more detail.
12    
13    .  JIT now supports callouts and all of the backtracking verbs.
14    
15    .  Unicode validation has been updated in the light of Unicode Corrigendum #9,
16       which points out that "non characters" are not "characters that may not
17       appear in Unicode strings" but rather "characters that are reserved for
18       internal use and have only local meaning".
19    
20    .  (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
21       creator of a pattern can specify lower (but not higher) limits for the
22       matching process.
23    
24    .  The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
25       the (*UTF) feature, as this could be a security issue.
26    
27    
28    Release 8.32 30-November-2012
29    -----------------------------
30    
31    This release fixes a number of bugs, but also has some new features. These are
32    the highlights:
33    
34    .  There is now support for 32-bit character strings and UTF-32. Like the
35       16-bit support, this is done by compiling a separate 32-bit library.
36    
37    .  \X now matches a Unicode extended grapheme cluster.
38    
39    .  Case-independent matching of Unicode characters that have more than one
40       "other case" now makes all three (or more) characters equivalent. This
41       applies, for example, to Greek Sigma, which has two lowercase versions.
42    
43    .  Unicode character properties are updated to Unicode 6.2.0.
44    
45    .  The EBCDIC support, which had decayed, has had a spring clean.
46    
47    .  A number of JIT optimizations have been added, which give faster JIT
48       execution speed. In addition, a new direct interface to JIT execution is
49       available. This bypasses some of the sanity checks of pcre_exec() to give a
50       noticeable speed-up.
51    
52    .  A number of issues in pcregrep have been fixed, making it more compatible
53       with GNU grep. In particular, --exclude and --include (and variants) apply
54       to all files now, not just those obtained from scanning a directory
55       recursively. In Windows environments, the default action for directories is
56       now "skip" instead of "read" (which provokes an error).
57    
58    .  If the --only-matching (-o) option in pcregrep is specified multiple
59       times, each one causes appropriate output. For example, -o1 -o2 outputs the
60       substrings matched by the 1st and 2nd capturing parentheses. A separating
61       string can be specified by --om-separator (default empty).
62    
63    .  When PCRE is built via Autotools using a version of gcc that has the
64       "visibility" feature, it is used to hide internal library functions that are
65       not part of the public API.
66    
67    
68    Release 8.31 06-July-2012
69    -------------------------
70    
71    This is mainly a bug-fixing release, with a small number of developments:
72    
73    . The JIT compiler now supports partial matching and the (*MARK) and
74      (*COMMIT) verbs.
75    
76    . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
77      pattern.
78    
79    . There should be a performance improvement when using the heap instead of the
80      stack for recursion.
81    
82    . pcregrep can now be linked with libedit as an alternative to libreadline.
83    
84    . pcregrep now has a --file-list option where the list of files to scan is
85      given as a file.
86    
87    . pcregrep now recognizes binary files and there are related options.
88    
89    . The Unicode tables have been updated to 6.1.0.
90    
91    As always, the full list of changes is in the ChangeLog file.
92    
93    
94    Release 8.30 04-February-2012
95    -----------------------------
96    
97    Release 8.30 introduces a major new feature: support for 16-bit character
98    strings, compiled as a separate library. There are a few changes to the
99    8-bit library, in addition to some bug fixes.
100    
101    . The pcre_info() function, which has been obsolete for over 10 years, has
102      been removed.
103    
104    . When a compiled pattern was saved to a file and later reloaded on a host
105      with different endianness, PCRE used automatically to swap the bytes in some
106      of the data fields. With the advent of the 16-bit library, where more of this
107      swapping is needed, it is no longer done automatically. Instead, the bad
108      endianness is detected and a specific error is given. The user can then call
109      a new function called pcre_pattern_to_host_byte_order() (or an equivalent
110      16-bit function) to do the swap.
111    
112    . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
113      code points and are now faulted. (They are the so-called "surrogates"
114      that are reserved for coding high values in UTF-16.)
115    
116    
117    Release 8.21 12-Dec-2011
118    ------------------------
119    
120    This is almost entirely a bug-fix release. The only new feature is the ability
121    to obtain the size of the memory used by the JIT compiler.
122    
123    
124    Release 8.20 21-Oct-2011
125    ------------------------
126    
127    The main change in this release is the inclusion of Zoltan Herczeg's
128    just-in-time compiler support, which can be accessed by building PCRE with
129    --enable-jit. Large performance benefits can be had in many situations. 8.20
130    also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
131    a number of infelicities and differences from Perl.
132    
133    
134    Release 8.13 16-Aug-2011
135    ------------------------
136    
137    This is mainly a bug-fix release. There has been a lot of internal refactoring.
138    The Unicode tables have been updated. The only new feature in the library is
139    the passing of *MARK information to callouts. Some additions have been made to
140    pcretest to make testing easier and more comprehensive. There is a new option
141    for pcregrep to adjust its internal buffer size.
142    
143    
144    Release 8.12 15-Jan-2011
145    ------------------------
146    
147    This release fixes some bugs in pcregrep, one of which caused the tests to fail
148    on 64-bit big-endian systems. There are no changes to the code of the library.
149    
150    
151    Release 8.11 10-Dec-2010
152    ------------------------
153    
154    A number of bugs in the library and in pcregrep have been fixed. As always, see
155    ChangeLog for details. The following are the non-bug-fix changes:
156    
157    . Added --match-limit and --recursion-limit to pcregrep.
158    
159    . Added an optional parentheses number to the -o and --only-matching options
160      of pcregrep.
161    
162    . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
163      \B.
164    
165    . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
166      bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
167    
168    . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
169      START_OPTIMIZE option, which is now allowed at compile time
170    
171    
172    Release 8.10 25-Jun-2010
173    ------------------------
174    
175    There are two major additions: support for (*MARK) and friends, and the option
176    PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
177    opposites) so that they make use of Unicode properties. There are also a number
178    of lesser new features, and several bugs have been fixed. A new option,
179    --line-buffered, has been added to pcregrep, for use when it is connected to
180    pipes.
181    
182    
183    Release 8.02 19-Mar-2010
184    ------------------------
185    
186    Another bug-fix release.
187    
188    
189    Release 8.01 19-Jan-2010
190    ------------------------
191    
192    This is a bug-fix release. Several bugs in the code itself and some bugs and
193    infelicities in the build system have been fixed.
194    
195    
196    Release 8.00 19-Oct-09
197    ----------------------
198    
199    Bugs have been fixed in the library and in pcregrep. There are also some
200    enhancements. Restrictions on patterns used for partial matching have been
201    removed, extra information is given for partial matches, the partial matching
202    process has been improved, and an option to make a partial match override a
203    full match is available. The "study" process has been enhanced by finding a
204    lower bound matching length. Groups with duplicate numbers may now have
205    duplicated names without the use of PCRE_DUPNAMES. However, they may not have
206    different names. The documentation has been revised to reflect these changes.
207    The version number has been expanded to 3 digits as it is clear that the rate
208    of change is not slowing down.
209    
210    
211    Release 7.9 11-Apr-09
212    ---------------------
213    
214    Mostly bugfixes and tidies with just a couple of minor functional additions.
215    
216    
217    Release 7.8 05-Sep-08
218    ---------------------
219    
220    More bug fixes, plus a performance improvement in Unicode character property
221    lookup.
222    
223    
224    Release 7.7 07-May-08
225    ---------------------
226    
227    This is once again mainly a bug-fix release, but there are a couple of new
228    features.
229    
230    
231    Release 7.6 28-Jan-08
232    ---------------------
233    
234    The main reason for having this release so soon after 7.5 is because it fixes a
235    potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
236    addition, the CMake configuration files have been brought up to date.
237    
238    
239    Release 7.5 10-Jan-08
240    ---------------------
241    
242    This is mainly a bug-fix release. However the ability to link pcregrep with
243    libz or libbz2 and the ability to link pcretest with libreadline have been
244    added. Also the --line-offsets and --file-offsets options were added to
245    pcregrep.
246    
247    
248    Release 7.4 21-Sep-07
249    ---------------------
250    
251    The only change of specification is the addition of options to control whether
252    \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
253    Otherwise, the changes are bug fixes and a refactoring to reduce the number of
254    relocations needed in a shared library. There have also been some documentation
255    updates, in particular, some more information about using CMake to build PCRE
256    has been added to the NON-UNIX-USE file.
257    
258    
259    Release 7.3 28-Aug-07
260    ---------------------
261    
262    Most changes are bug fixes. Some that are not:
263    
264    1. There is some support for Perl 5.10's experimental "backtracking control
265       verbs" such as (*PRUNE).
266    
267    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
268       restrictive in the strings it accepts.
269    
270    3. Checking for potential integer overflow has been made more dynamic, and as a
271       consequence there is no longer a hard limit on the size of a subpattern that
272       has a limited repeat count.
273    
274    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
275       no longer advance by two characters instead of one when an unanchored match
276       fails at CRLF if there are explicit CR or LF matches within the pattern.
277       This gets rid of some anomalous effects that previously occurred.
278    
279    5. Some PCRE-specific settings for varying the newline options at the start of
280       a pattern have been added.
281    
282    
283    Release 7.2 19-Jun-07
284    ---------------------
285    
286    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
287    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
288    and \V).
289    
290    Correction to the notes for 7.1: the note about shared libraries for Windows is
291    wrong. Previously, three libraries were built, but each could function
292    independently. For example, the pcreposix library also included all the
293    functions from the basic pcre library. The change is that the three libraries
294    are no longer independent. They are like the Unix libraries. To use the
295    pcreposix functions, for example, you need to link with both the pcreposix and
296    the basic pcre library.
297    
298    Some more features from Perl 5.10 have been added:
299    
300      (?-n) and (?+n) relative references for recursion and subroutines.
301    
302      (?(-n) and (?(+n) relative references as conditions.
303    
304      \k{name} and \g{name} are synonyms for \k<name>.
305    
306      \K to reset the start of the matched string; for example, (foo)\Kbar
307      matches bar preceded by foo, but only sets bar as the matched string.
308    
309      (?| introduces a group where the capturing parentheses in each alternative
310      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
311      parentheses number 1 in both cases.
312    
313      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
314    
315    
316    Release 7.1 24-Apr-07
317    ---------------------
318    
319    There is only one new feature in this release: a linebreak setting of
320    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
321    recognizes only CRLF, CR, and LF as linebreaks.
322    
323    A few bugs are fixed (see ChangeLog for details), but the major change is a
324    complete re-implementation of the build system. This now has full Autotools
325    support and so is now "standard" in some sense. It should help with compiling
326    PCRE in a wide variety of environments.
327    
328    NOTE: when building shared libraries for Windows, three dlls are now built,
329    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
330    included in a single dll.
331    
332    Another important change is that the dftables auxiliary program is no longer
333    compiled and run at "make" time by default. Instead, a default set of character
334    tables (assuming ASCII coding) is used. If you want to use dftables to generate
335    the character tables as previously, add --enable-rebuild-chartables to the
336    "configure" command. You must do this if you are compiling PCRE to run on a
337    system that uses EBCDIC code.
338    
339    There is a discussion about character tables in the README file. The default is
340    not to use dftables so that that there is no problem when cross-compiling.
341    
342    
343    Release 7.0 19-Dec-06
344    ---------------------
345    
346    This release has a new major number because there have been some internal
347    upheavals to facilitate the addition of new optimizations and other facilities,
348    and to make subsequent maintenance and extension easier. Compilation is likely
349    to be a bit slower, but there should be no major effect on runtime performance.
350    Previously compiled patterns are NOT upwards compatible with this release. If
351    you have saved compiled patterns from a previous release, you will have to
352    re-compile them. Important changes that are visible to users are:
353    
354    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
355       some more scripts.
356    
357    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
358       sequence as a newline.
359    
360    3. The \R escape matches a single Unicode newline sequence as a single unit.
361    
362    4. New features that will appear in Perl 5.10 are now in PCRE. These include
363       alternative Perl syntax for named parentheses, and Perl syntax for
364       recursion.
365    
366    5. The C++ wrapper interface has been extended by the addition of a
367       QuoteMeta function and the ability to allow copy construction and
368       assignment.
369    
370    For a complete list of changes, see the ChangeLog file.
371    
372    
373    Release 6.7 04-Jul-06
374    ---------------------
375    
376    The main additions to this release are the ability to use the same name for
377    multiple sets of parentheses, and support for CRLF line endings in both the
378    library and pcregrep (and in pcretest for testing).
379    
380    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
381    significantly reduced for certain subject strings.
382    
383    
384    Release 6.5 01-Feb-06
385    ---------------------
386    
387    Important changes in this release:
388    
389    1. A number of new features have been added to pcregrep.
390    
391    2. The Unicode property tables have been updated to Unicode 4.1.0, and the
392       supported properties have been extended with script names such as "Arabic",
393       and the derived properties "Any" and "L&". This has necessitated a change to
394       the interal format of compiled patterns. Any saved compiled patterns that
395       use \p or \P must be recompiled.
396    
397    3. The specification of recursion in patterns has been changed so that all
398       recursive subpatterns are automatically treated as atomic groups. Thus, for
399       example, (?R) is treated as if it were (?>(?R)). This is necessary because
400       otherwise there are situations where recursion does not work.
401    
402    See the ChangeLog for a complete list of changes, which include a number of bug
403    fixes and tidies.
404    
405    
406    Release 6.0 07-Jun-05
407    ---------------------
408    
409    The release number has been increased to 6.0 because of the addition of several
410    major new pieces of functionality.
411    
412    A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
413    algorithm, has been added. This has a number of advantages for certain cases,
414    though it does run more slowly, and lacks the ability to capture substrings. On
415    the other hand, it does find all matches, not just the first, and it works
416    better for partial matching. The pcrematching man page discusses the
417    differences.
418    
419    The pcretest program has been enhanced so that it can make use of the new
420    pcre_dfa_exec() matching function and the extra features it provides.
421    
422    The distribution now includes a C++ wrapper library. This is built
423    automatically if a C++ compiler is found. The pcrecpp man page discusses this
424    interface.
425    
426    The code itself has been re-organized into many more files, one for each
427    function, so it no longer requires everything to be linked in when static
428    linkage is used. As a consequence, some internal functions have had to have
429    their names exposed. These functions all have names starting with _pcre_. They
430    are undocumented, and are not intended for use by outside callers.
431    
432    The pcregrep program has been enhanced with new functionality such as
433    multiline-matching and options for output more matching context. See the
434    ChangeLog for a complete list of changes to the library and the utility
435    programs.
436    
437    
438    Release 5.0 13-Sep-04
439    ---------------------
440    
441    The licence under which PCRE is released has been changed to the more
442    conventional "BSD" licence.
443    
444    In the code, some bugs have been fixed, and there are also some major changes
445    in this release (which is why I've increased the number to 5.0). Some changes
446    are internal rearrangements, and some provide a number of new facilities. The
447    new features are:
448    
449    1. There's an "automatic callout" feature that inserts callouts before every
450       item in the regex, and there's a new callout field that gives the position
451       in the pattern - useful for debugging and tracing.
452    
453    2. The extra_data structure can now be used to pass in a set of character
454       tables at exec time. This is useful if compiled regex are saved and re-used
455       at a later time when the tables may not be at the same address. If the
456       default internal tables are used, the pointer saved with the compiled
457       pattern is now set to NULL, which means that you don't need to do anything
458       special unless you are using custom tables.
459    
460    3. It is possible, with some restrictions on the content of the regex, to
461       request "partial" matching. A special return code is given if all of the
462       subject string matched part of the regex. This could be useful for testing
463       an input field as it is being typed.
464    
465    4. There is now some optional support for Unicode character properties, which
466       means that the patterns items such as \p{Lu} and \X can now be used. Only
467       the general category properties are supported. If PCRE is compiled with this
468       support, an additional 90K data structure is include, which increases the
469       size of the library dramatically.
470    
471    5. There is support for saving compiled patterns and re-using them later.
472    
473    6. There is support for running regular expressions that were compiled on a
474       different host with the opposite endianness.
475    
476    7. The pcretest program has been extended to accommodate the new features.
477    
478    The main internal rearrangement is that sequences of literal characters are no
479    longer handled as strings. Instead, each character is handled on its own. This
480    makes some UTF-8 handling easier, and makes the support of partial matching
481    possible. Compiled patterns containing long literal strings will be larger as a
482    result of this change; I hope that performance will not be much affected.
483    
484    
485  Release 4.5 01-Dec-03  Release 4.5 01-Dec-03
486  ---------------------  ---------------------
487    

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