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Revision 654 - (hide annotations) (download)
Tue Aug 2 11:00:40 2011 UTC (3 years, 1 month ago) by ph10
File size: 20157 byte(s)
Documentation and general text tidies in preparation for test release.

1 nigel 41 News about PCRE releases
2     ------------------------
3    
4 ph10 654 Release 8.13 02-Aug-2011
5     ------------------------
6    
7     This is mainly a bug-fix release. There has been a lot of internal refactoring.
8     The Unicode tables have been updated. The only new feature in the library is
9     the passing of *MARK information to callouts. Some additions have been made to
10     pcretest to make testing easier and more comprehensive. There is a new option
11     for pcregrep to adjust its internal buffer size.
12    
13    
14 ph10 588 Release 8.12 15-Jan-2011
15     ------------------------
16    
17 ph10 589 This release fixes some bugs in pcregrep, one of which caused the tests to fail
18 ph10 588 on 64-bit big-endian systems. There are no changes to the code of the library.
19    
20    
21 ph10 581 Release 8.11 10-Dec-2010
22 ph10 579 ------------------------
23    
24     A number of bugs in the library and in pcregrep have been fixed. As always, see
25     ChangeLog for details. The following are the non-bug-fix changes:
26    
27     . Added --match-limit and --recursion-limit to pcregrep.
28    
29     . Added an optional parentheses number to the -o and --only-matching options
30     of pcregrep.
31    
32     . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
33     \B.
34    
35     . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
36     bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
37    
38     . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
39     START_OPTIMIZE option, which is now allowed at compile time
40    
41    
42 ph10 548 Release 8.10 25-Jun-2010
43 ph10 535 ------------------------
44    
45 ph10 545 There are two major additions: support for (*MARK) and friends, and the option
46 ph10 535 PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
47     opposites) so that they make use of Unicode properties. There are also a number
48     of lesser new features, and several bugs have been fixed. A new option,
49     --line-buffered, has been added to pcregrep, for use when it is connected to
50     pipes.
51    
52    
53 ph10 508 Release 8.02 19-Mar-2010
54 ph10 507 ------------------------
55    
56     Another bug-fix release.
57    
58    
59 ph10 489 Release 8.01 19-Jan-2010
60     ------------------------
61    
62     This is a bug-fix release. Several bugs in the code itself and some bugs and
63     infelicities in the build system have been fixed.
64    
65    
66 ph10 469 Release 8.00 19-Oct-09
67 ph10 461 ----------------------
68    
69     Bugs have been fixed in the library and in pcregrep. There are also some
70     enhancements. Restrictions on patterns used for partial matching have been
71     removed, extra information is given for partial matches, the partial matching
72     process has been improved, and an option to make a partial match override a
73     full match is available. The "study" process has been enhanced by finding a
74     lower bound matching length. Groups with duplicate numbers may now have
75     duplicated names without the use of PCRE_DUPNAMES. However, they may not have
76     different names. The documentation has been revised to reflect these changes.
77     The version number has been expanded to 3 digits as it is clear that the rate
78     of change is not slowing down.
79    
80    
81 ph10 415 Release 7.9 11-Apr-09
82 ph10 411 ---------------------
83 ph10 345
84 ph10 411 Mostly bugfixes and tidies with just a couple of minor functional additions.
85    
86    
87 ph10 374 Release 7.8 05-Sep-08
88 ph10 371 ---------------------
89    
90     More bug fixes, plus a performance improvement in Unicode character property
91     lookup.
92    
93    
94 ph10 347 Release 7.7 07-May-08
95 ph10 345 ---------------------
96    
97     This is once again mainly a bug-fix release, but there are a couple of new
98     features.
99    
100    
101 ph10 319 Release 7.6 28-Jan-08
102 ph10 309 ---------------------
103    
104     The main reason for having this release so soon after 7.5 is because it fixes a
105     potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
106     addition, the CMake configuration files have been brought up to date.
107    
108    
109 ph10 298 Release 7.5 10-Jan-08
110 ph10 289 ---------------------
111 ph10 122
112 ph10 289 This is mainly a bug-fix release. However the ability to link pcregrep with
113     libz or libbz2 and the ability to link pcretest with libreadline have been
114     added. Also the --line-offsets and --file-offsets options were added to
115     pcregrep.
116    
117    
118 ph10 260 Release 7.4 21-Sep-07
119 ph10 242 ---------------------
120    
121 ph10 243 The only change of specification is the addition of options to control whether
122 ph10 242 \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
123 ph10 243 Otherwise, the changes are bug fixes and a refactoring to reduce the number of
124 ph10 261 relocations needed in a shared library. There have also been some documentation
125     updates, in particular, some more information about using CMake to build PCRE
126     has been added to the NON-UNIX-USE file.
127 ph10 242
128    
129 ph10 228 Release 7.3 28-Aug-07
130 ph10 212 ---------------------
131    
132     Most changes are bug fixes. Some that are not:
133    
134     1. There is some support for Perl 5.10's experimental "backtracking control
135     verbs" such as (*PRUNE).
136    
137     2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
138     restrictive in the strings it accepts.
139    
140     3. Checking for potential integer overflow has been made more dynamic, and as a
141     consequence there is no longer a hard limit on the size of a subpattern that
142     has a limited repeat count.
143 ph10 227
144     4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
145     no longer advance by two characters instead of one when an unanchored match
146     fails at CRLF if there are explicit CR or LF matches within the pattern.
147 ph10 226 This gets rid of some anomalous effects that previously occurred.
148 ph10 212
149 ph10 227 5. Some PCRE-specific settings for varying the newline options at the start of
150     a pattern have been added.
151 ph10 212
152 ph10 227
153 ph10 184 Release 7.2 19-Jun-07
154 ph10 157 ---------------------
155    
156 ph10 172 WARNING: saved patterns that were compiled by earlier versions of PCRE must be
157 ph10 181 recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
158     and \V).
159 ph10 168
160 ph10 159 Correction to the notes for 7.1: the note about shared libraries for Windows is
161     wrong. Previously, three libraries were built, but each could function
162     independently. For example, the pcreposix library also included all the
163     functions from the basic pcre library. The change is that the three libraries
164     are no longer independent. They are like the Unix libraries. To use the
165     pcreposix functions, for example, you need to link with both the pcreposix and
166 ph10 157 the basic pcre library.
167    
168 ph10 166 Some more features from Perl 5.10 have been added:
169 ph10 157
170 ph10 166 (?-n) and (?+n) relative references for recursion and subroutines.
171 ph10 172
172     (?(-n) and (?(+n) relative references as conditions.
173 ph10 182
174 ph10 181 \k{name} and \g{name} are synonyms for \k<name>.
175 ph10 172
176 ph10 168 \K to reset the start of the matched string; for example, (foo)\Kbar
177 ph10 175 matches bar preceded by foo, but only sets bar as the matched string.
178 ph10 182
179     (?| introduces a group where the capturing parentheses in each alternative
180     start from the same number; for example, (?|(abc)|(xyz)) sets capturing
181 ph10 175 parentheses number 1 in both cases.
182 ph10 166
183 ph10 182 \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
184 ph10 166
185 ph10 182
186 ph10 155 Release 7.1 24-Apr-07
187 nigel 93 ---------------------
188    
189 ph10 155 There is only one new feature in this release: a linebreak setting of
190     PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
191     recognizes only CRLF, CR, and LF as linebreaks.
192 ph10 122
193 ph10 155 A few bugs are fixed (see ChangeLog for details), but the major change is a
194     complete re-implementation of the build system. This now has full Autotools
195     support and so is now "standard" in some sense. It should help with compiling
196     PCRE in a wide variety of environments.
197    
198 ph10 146 NOTE: when building shared libraries for Windows, three dlls are now built,
199     called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
200     included in a single dll.
201    
202     Another important change is that the dftables auxiliary program is no longer
203 ph10 128 compiled and run at "make" time by default. Instead, a default set of character
204     tables (assuming ASCII coding) is used. If you want to use dftables to generate
205     the character tables as previously, add --enable-rebuild-chartables to the
206     "configure" command. You must do this if you are compiling PCRE to run on a
207     system that uses EBCDIC code.
208 ph10 122
209 ph10 128 There is a discussion about character tables in the README file. The default is
210     not to use dftables so that that there is no problem when cross-compiling.
211    
212    
213 ph10 122 Release 7.0 19-Dec-06
214     ---------------------
215    
216 nigel 93 This release has a new major number because there have been some internal
217     upheavals to facilitate the addition of new optimizations and other facilities,
218     and to make subsequent maintenance and extension easier. Compilation is likely
219     to be a bit slower, but there should be no major effect on runtime performance.
220     Previously compiled patterns are NOT upwards compatible with this release. If
221     you have saved compiled patterns from a previous release, you will have to
222     re-compile them. Important changes that are visible to users are:
223    
224     1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
225     some more scripts.
226    
227     2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
228     sequence as a newline.
229    
230     3. The \R escape matches a single Unicode newline sequence as a single unit.
231    
232     4. New features that will appear in Perl 5.10 are now in PCRE. These include
233     alternative Perl syntax for named parentheses, and Perl syntax for
234     recursion.
235    
236     5. The C++ wrapper interface has been extended by the addition of a
237     QuoteMeta function and the ability to allow copy construction and
238     assignment.
239    
240     For a complete list of changes, see the ChangeLog file.
241    
242    
243 nigel 91 Release 6.7 04-Jul-06
244     ---------------------
245    
246     The main additions to this release are the ability to use the same name for
247     multiple sets of parentheses, and support for CRLF line endings in both the
248     library and pcregrep (and in pcretest for testing).
249    
250     Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
251     significantly reduced for certain subject strings.
252    
253    
254 nigel 87 Release 6.5 01-Feb-06
255     ---------------------
256    
257     Important changes in this release:
258    
259     1. A number of new features have been added to pcregrep.
260    
261     2. The Unicode property tables have been updated to Unicode 4.1.0, and the
262     supported properties have been extended with script names such as "Arabic",
263     and the derived properties "Any" and "L&". This has necessitated a change to
264     the interal format of compiled patterns. Any saved compiled patterns that
265     use \p or \P must be recompiled.
266    
267     3. The specification of recursion in patterns has been changed so that all
268     recursive subpatterns are automatically treated as atomic groups. Thus, for
269     example, (?R) is treated as if it were (?>(?R)). This is necessary because
270     otherwise there are situations where recursion does not work.
271    
272     See the ChangeLog for a complete list of changes, which include a number of bug
273     fixes and tidies.
274    
275    
276 nigel 77 Release 6.0 07-Jun-05
277     ---------------------
278    
279     The release number has been increased to 6.0 because of the addition of several
280     major new pieces of functionality.
281    
282     A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
283     algorithm, has been added. This has a number of advantages for certain cases,
284     though it does run more slowly, and lacks the ability to capture substrings. On
285     the other hand, it does find all matches, not just the first, and it works
286     better for partial matching. The pcrematching man page discusses the
287     differences.
288    
289     The pcretest program has been enhanced so that it can make use of the new
290     pcre_dfa_exec() matching function and the extra features it provides.
291    
292     The distribution now includes a C++ wrapper library. This is built
293     automatically if a C++ compiler is found. The pcrecpp man page discusses this
294     interface.
295    
296     The code itself has been re-organized into many more files, one for each
297     function, so it no longer requires everything to be linked in when static
298     linkage is used. As a consequence, some internal functions have had to have
299     their names exposed. These functions all have names starting with _pcre_. They
300     are undocumented, and are not intended for use by outside callers.
301    
302     The pcregrep program has been enhanced with new functionality such as
303     multiline-matching and options for output more matching context. See the
304     ChangeLog for a complete list of changes to the library and the utility
305     programs.
306    
307    
308 nigel 75 Release 5.0 13-Sep-04
309     ---------------------
310    
311     The licence under which PCRE is released has been changed to the more
312     conventional "BSD" licence.
313    
314     In the code, some bugs have been fixed, and there are also some major changes
315     in this release (which is why I've increased the number to 5.0). Some changes
316     are internal rearrangements, and some provide a number of new facilities. The
317     new features are:
318    
319     1. There's an "automatic callout" feature that inserts callouts before every
320     item in the regex, and there's a new callout field that gives the position
321     in the pattern - useful for debugging and tracing.
322    
323     2. The extra_data structure can now be used to pass in a set of character
324     tables at exec time. This is useful if compiled regex are saved and re-used
325     at a later time when the tables may not be at the same address. If the
326     default internal tables are used, the pointer saved with the compiled
327     pattern is now set to NULL, which means that you don't need to do anything
328     special unless you are using custom tables.
329    
330     3. It is possible, with some restrictions on the content of the regex, to
331     request "partial" matching. A special return code is given if all of the
332     subject string matched part of the regex. This could be useful for testing
333     an input field as it is being typed.
334    
335     4. There is now some optional support for Unicode character properties, which
336     means that the patterns items such as \p{Lu} and \X can now be used. Only
337     the general category properties are supported. If PCRE is compiled with this
338     support, an additional 90K data structure is include, which increases the
339     size of the library dramatically.
340    
341     5. There is support for saving compiled patterns and re-using them later.
342    
343     6. There is support for running regular expressions that were compiled on a
344     different host with the opposite endianness.
345    
346     7. The pcretest program has been extended to accommodate the new features.
347    
348     The main internal rearrangement is that sequences of literal characters are no
349     longer handled as strings. Instead, each character is handled on its own. This
350     makes some UTF-8 handling easier, and makes the support of partial matching
351     possible. Compiled patterns containing long literal strings will be larger as a
352     result of this change; I hope that performance will not be much affected.
353    
354    
355 nigel 73 Release 4.5 01-Dec-03
356     ---------------------
357    
358     Again mainly a bug-fix and tidying release, with only a couple of new features:
359    
360     1. It's possible now to compile PCRE so that it does not use recursive
361     function calls when matching. Instead it gets memory from the heap. This slows
362     things down, but may be necessary on systems with limited stacks.
363    
364     2. UTF-8 string checking has been tightened to reject overlong sequences and to
365     check that a starting offset points to the start of a character. Failure of the
366     latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
367    
368     3. PCRE can now be compiled for systems that use EBCDIC code.
369    
370    
371 nigel 71 Release 4.4 21-Aug-03
372     ---------------------
373    
374     This is mainly a bug-fix and tidying release. The only new feature is that PCRE
375     checks UTF-8 strings for validity by default. There is an option to suppress
376     this, just in case anybody wants that teeny extra bit of performance.
377    
378    
379     Releases 4.1 - 4.3
380     ------------------
381    
382     Sorry, I forgot about updating the NEWS file for these releases. Please take a
383     look at ChangeLog.
384    
385    
386 nigel 63 Release 4.0 17-Feb-03
387     ---------------------
388    
389     There have been a lot of changes for the 4.0 release, adding additional
390     functionality and mending bugs. Below is a list of the highlights of the new
391     functionality. For full details of these features, please consult the
392     documentation. For a complete list of changes, see the ChangeLog file.
393    
394     1. Support for Perl's \Q...\E escapes.
395    
396     2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
397     package. They provide some syntactic sugar for simple cases of "atomic
398     grouping".
399    
400     3. Support for the \G assertion. It is true when the current matching position
401     is at the start point of the match.
402    
403     4. A new feature that provides some of the functionality that Perl provides
404     with (?{...}). The facility is termed a "callout". The way it is done in PCRE
405     is for the caller to provide an optional function, by setting pcre_callout to
406     its entry point. To get the function called, the regex must include (?C) at
407     appropriate points.
408    
409     5. Support for recursive calls to individual subpatterns. This makes it really
410     easy to get totally confused.
411    
412     6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
413     name a group.
414    
415     7. Several extensions to UTF-8 support; it is now fairly complete. There is an
416     option for pcregrep to make it operate in UTF-8 mode.
417    
418     8. The single man page has been split into a number of separate man pages.
419     These also give rise to individual HTML pages which are put in a separate
420     directory. There is an index.html page that lists them all. Some hyperlinking
421     between the pages has been installed.
422    
423    
424 nigel 53 Release 3.5 15-Aug-01
425     ---------------------
426    
427     1. The configuring system has been upgraded to use later versions of autoconf
428     and libtool. By default it builds both a shared and a static library if the OS
429     supports it. You can use --disable-shared or --disable-static on the configure
430     command if you want only one of them.
431    
432     2. The pcretest utility is now installed along with pcregrep because it is
433     useful for users (to test regexs) and by doing this, it automatically gets
434     relinked by libtool. The documentation has been turned into a man page, so
435     there are now .1, .txt, and .html versions in /doc.
436    
437     3. Upgrades to pcregrep:
438     (i) Added long-form option names like gnu grep.
439     (ii) Added --help to list all options with an explanatory phrase.
440     (iii) Added -r, --recursive to recurse into sub-directories.
441     (iv) Added -f, --file to read patterns from a file.
442    
443     4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
444     script, to force use of CR or LF instead of \n in the source. On non-Unix
445     systems, the value can be set in config.h.
446    
447     5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
448     absolute limit. Changed the text of the error message to make this clear, and
449     likewise updated the man page.
450    
451     6. The limit of 99 on the number of capturing subpatterns has been removed.
452     The new limit is 65535, which I hope will not be a "real" limit.
453    
454    
455 nigel 49 Release 3.3 01-Aug-00
456     ---------------------
457    
458     There is some support for UTF-8 character strings. This is incomplete and
459     experimental. The documentation describes what is and what is not implemented.
460     Otherwise, this is just a bug-fixing release.
461    
462    
463 nigel 43 Release 3.0 01-Feb-00
464     ---------------------
465 nigel 41
466 nigel 43 1. A "configure" script is now used to configure PCRE for Unix systems. It
467     builds a Makefile, a config.h file, and the pcre-config script.
468    
469     2. PCRE is built as a shared library by default.
470    
471     3. There is support for POSIX classes such as [:alpha:].
472    
473     5. There is an experimental recursion feature.
474    
475 nigel 41 ----------------------------------------------------------------------------
476     IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
477    
478     Please note that there has been a change in the API such that a larger
479     ovector is required at matching time, to provide some additional workspace.
480     The new man page has details. This change was necessary in order to support
481     some of the new functionality in Perl 5.005.
482    
483     IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
484    
485     Another (I hope this is the last!) change has been made to the API for the
486     pcre_compile() function. An additional argument has been added to make it
487     possible to pass over a pointer to character tables built in the current
488     locale by pcre_maketables(). To use the default tables, this new arguement
489     should be passed as NULL.
490    
491     IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
492    
493     Yet another (and again I hope this really is the last) change has been made
494     to the API for the pcre_exec() function. An additional argument has been
495     added to make it possible to start the match other than at the start of the
496     subject string. This is important if there are lookbehinds. The new man
497     page has the details, but you just want to convert existing programs, all
498     you need to do is to stick in a new fifth argument to pcre_exec(), with a
499     value of zero. For example, change
500    
501     pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
502     to
503     pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
504    
505     ****

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