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

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