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

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