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1 nigel 41 News about PCRE releases
2     ------------------------
4 ph10 840 Release 8.30
5     ------------
7 ph10 842 Release 8.30 introduces a major new feature: support for 16-bit character
8 ph10 857 strings, compiled as a separate library. There are a few changes to the
9     8-bit library, in addition to some bug fixes.
10 ph10 840
11 ph10 857 . The pcre_info() function, which has been obsolete for over 10 years, has
12     been removed.
13 ph10 840
14 ph10 857 . 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 ph10 836 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 ph10 738 Release 8.20 21-Oct-2011
35     ------------------------
36 ph10 672
37 ph10 691 The main change in this release is the inclusion of Zoltan Herczeg's
38 ph10 672 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 ph10 738 a number of infelicities and differences from Perl.
42 ph10 672
44 ph10 659 Release 8.13 16-Aug-2011
45 ph10 654 ------------------------
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 ph10 588 Release 8.12 15-Jan-2011
55     ------------------------
57 ph10 589 This release fixes some bugs in pcregrep, one of which caused the tests to fail
58 ph10 588 on 64-bit big-endian systems. There are no changes to the code of the library.
61 ph10 581 Release 8.11 10-Dec-2010
62 ph10 579 ------------------------
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 ph10 548 Release 8.10 25-Jun-2010
83 ph10 535 ------------------------
85 ph10 545 There are two major additions: support for (*MARK) and friends, and the option
86 ph10 535 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 ph10 508 Release 8.02 19-Mar-2010
94 ph10 507 ------------------------
96     Another bug-fix release.
99 ph10 489 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 ph10 469 Release 8.00 19-Oct-09
107 ph10 461 ----------------------
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 ph10 415 Release 7.9 11-Apr-09
122 ph10 411 ---------------------
123 ph10 345
124 ph10 411 Mostly bugfixes and tidies with just a couple of minor functional additions.
127 ph10 374 Release 7.8 05-Sep-08
128 ph10 371 ---------------------
130     More bug fixes, plus a performance improvement in Unicode character property
131     lookup.
134 ph10 347 Release 7.7 07-May-08
135 ph10 345 ---------------------
137     This is once again mainly a bug-fix release, but there are a couple of new
138     features.
141 ph10 319 Release 7.6 28-Jan-08
142 ph10 309 ---------------------
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 ph10 298 Release 7.5 10-Jan-08
150 ph10 289 ---------------------
151 ph10 122
152 ph10 289 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 ph10 260 Release 7.4 21-Sep-07
159 ph10 242 ---------------------
161 ph10 243 The only change of specification is the addition of options to control whether
162 ph10 242 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
163 ph10 243 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
164 ph10 261 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.
167 ph10 242
169 ph10 228 Release 7.3 28-Aug-07
170 ph10 212 ---------------------
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.
183 ph10 227
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 ph10 226 This gets rid of some anomalous effects that previously occurred.
188 ph10 212
189 ph10 227 5. Some PCRE-specific settings for varying the newline options at the start of
190     a pattern have been added.
191 ph10 212
192 ph10 227
193 ph10 184 Release 7.2 19-Jun-07
194 ph10 157 ---------------------
196 ph10 172 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
197 ph10 181 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
198     and \V).
199 ph10 168
200 ph10 159 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 ph10 157 the basic pcre library.
208 ph10 166 Some more features from Perl 5.10 have been added:
209 ph10 157
210 ph10 166 (?-n) and (?+n) relative references for recursion and subroutines.
211 ph10 172
212     (?(-n) and (?(+n) relative references as conditions.
213 ph10 182
214 ph10 181 \k{name} and \g{name} are synonyms for \k<name>.
215 ph10 172
216 ph10 168 \K to reset the start of the matched string; for example, (foo)\Kbar
217 ph10 175 matches bar preceded by foo, but only sets bar as the matched string.
218 ph10 182
219     (?| introduces a group where the capturing parentheses in each alternative
220     start from the same number; for example, (?|(abc)|(xyz)) sets capturing
221 ph10 175 parentheses number 1 in both cases.
222 ph10 166
223 ph10 182 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
224 ph10 166
225 ph10 182
226 ph10 155 Release 7.1 24-Apr-07
227 nigel 93 ---------------------
229 ph10 155 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.
232 ph10 122
233 ph10 155 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 ph10 146 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 ph10 128 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.
248 ph10 122
249 ph10 128 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 ph10 122 Release 7.0 19-Dec-06
254     ---------------------
256 nigel 93 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 nigel 91 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 nigel 87 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 nigel 77 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 nigel 75 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 nigel 73 Release 4.5 01-Dec-03
396     ---------------------
398     Again mainly a bug-fix and tidying release, with only a couple of new features:
400     1. It's possible now to compile PCRE so that it does not use recursive
401     function calls when matching. Instead it gets memory from the heap. This slows
402     things down, but may be necessary on systems with limited stacks.
404     2. UTF-8 string checking has been tightened to reject overlong sequences and to
405     check that a starting offset points to the start of a character. Failure of the
406     latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
408     3. PCRE can now be compiled for systems that use EBCDIC code.
411 nigel 71 Release 4.4 21-Aug-03
412     ---------------------
414     This is mainly a bug-fix and tidying release. The only new feature is that PCRE
415     checks UTF-8 strings for validity by default. There is an option to suppress
416     this, just in case anybody wants that teeny extra bit of performance.
419     Releases 4.1 - 4.3
420     ------------------
422     Sorry, I forgot about updating the NEWS file for these releases. Please take a
423     look at ChangeLog.
426 nigel 63 Release 4.0 17-Feb-03
427     ---------------------
429     There have been a lot of changes for the 4.0 release, adding additional
430     functionality and mending bugs. Below is a list of the highlights of the new
431     functionality. For full details of these features, please consult the
432     documentation. For a complete list of changes, see the ChangeLog file.
434     1. Support for Perl's \Q...\E escapes.
436     2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
437     package. They provide some syntactic sugar for simple cases of "atomic
438     grouping".
440     3. Support for the \G assertion. It is true when the current matching position
441     is at the start point of the match.
443     4. A new feature that provides some of the functionality that Perl provides
444     with (?{...}). The facility is termed a "callout". The way it is done in PCRE
445     is for the caller to provide an optional function, by setting pcre_callout to
446     its entry point. To get the function called, the regex must include (?C) at
447     appropriate points.
449     5. Support for recursive calls to individual subpatterns. This makes it really
450     easy to get totally confused.
452     6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
453     name a group.
455     7. Several extensions to UTF-8 support; it is now fairly complete. There is an
456     option for pcregrep to make it operate in UTF-8 mode.
458     8. The single man page has been split into a number of separate man pages.
459     These also give rise to individual HTML pages which are put in a separate
460     directory. There is an index.html page that lists them all. Some hyperlinking
461     between the pages has been installed.
464 nigel 53 Release 3.5 15-Aug-01
465     ---------------------
467     1. The configuring system has been upgraded to use later versions of autoconf
468     and libtool. By default it builds both a shared and a static library if the OS
469     supports it. You can use --disable-shared or --disable-static on the configure
470     command if you want only one of them.
472     2. The pcretest utility is now installed along with pcregrep because it is
473     useful for users (to test regexs) and by doing this, it automatically gets
474     relinked by libtool. The documentation has been turned into a man page, so
475     there are now .1, .txt, and .html versions in /doc.
477     3. Upgrades to pcregrep:
478     (i) Added long-form option names like gnu grep.
479     (ii) Added --help to list all options with an explanatory phrase.
480     (iii) Added -r, --recursive to recurse into sub-directories.
481     (iv) Added -f, --file to read patterns from a file.
483     4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
484     script, to force use of CR or LF instead of \n in the source. On non-Unix
485     systems, the value can be set in config.h.
487     5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
488     absolute limit. Changed the text of the error message to make this clear, and
489     likewise updated the man page.
491     6. The limit of 99 on the number of capturing subpatterns has been removed.
492     The new limit is 65535, which I hope will not be a "real" limit.
495 nigel 49 Release 3.3 01-Aug-00
496     ---------------------
498     There is some support for UTF-8 character strings. This is incomplete and
499     experimental. The documentation describes what is and what is not implemented.
500     Otherwise, this is just a bug-fixing release.
503 nigel 43 Release 3.0 01-Feb-00
504     ---------------------
505 nigel 41
506 nigel 43 1. A "configure" script is now used to configure PCRE for Unix systems. It
507     builds a Makefile, a config.h file, and the pcre-config script.
509     2. PCRE is built as a shared library by default.
511     3. There is support for POSIX classes such as [:alpha:].
513     5. There is an experimental recursion feature.
515 nigel 41 ----------------------------------------------------------------------------
518     Please note that there has been a change in the API such that a larger
519     ovector is required at matching time, to provide some additional workspace.
520     The new man page has details. This change was necessary in order to support
521     some of the new functionality in Perl 5.005.
525     Another (I hope this is the last!) change has been made to the API for the
526     pcre_compile() function. An additional argument has been added to make it
527     possible to pass over a pointer to character tables built in the current
528     locale by pcre_maketables(). To use the default tables, this new arguement
529     should be passed as NULL.
533     Yet another (and again I hope this really is the last) change has been made
534     to the API for the pcre_exec() function. An additional argument has been
535     added to make it possible to start the match other than at the start of the
536     subject string. This is important if there are lookbehinds. The new man
537     page has the details, but you just want to convert existing programs, all
538     you need to do is to stick in a new fifth argument to pcre_exec(), with a
539     value of zero. For example, change
541     pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
542     to
543     pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
545     ****


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