/[pcre]/code/trunk/NEWS
ViewVC logotype

Diff of /code/trunk/NEWS

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 49 by nigel, Sat Feb 24 21:39:33 2007 UTC revision 589 by ph10, Sat Jan 15 11:31:39 2011 UTC
# Line 1  Line 1 
1  News about PCRE releases  News about PCRE releases
2  ------------------------  ------------------------
3    
4    Release 8.12 15-Jan-2011
5    ------------------------
6    
7    This release fixes some bugs in pcregrep, one of which caused the tests to fail
8    on 64-bit big-endian systems. There are no changes to the code of the library.
9    
10    
11    Release 8.11 10-Dec-2010
12    ------------------------
13    
14    A number of bugs in the library and in pcregrep have been fixed. As always, see
15    ChangeLog for details. The following are the non-bug-fix changes:
16    
17    . Added --match-limit and --recursion-limit to pcregrep.
18    
19    . Added an optional parentheses number to the -o and --only-matching options
20      of pcregrep.
21    
22    . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
23      \B.
24    
25    . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
26      bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
27    
28    . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
29      START_OPTIMIZE option, which is now allowed at compile time
30    
31    
32    Release 8.10 25-Jun-2010
33    ------------------------
34    
35    There are two major additions: support for (*MARK) and friends, and the option
36    PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
37    opposites) so that they make use of Unicode properties. There are also a number
38    of lesser new features, and several bugs have been fixed. A new option,
39    --line-buffered, has been added to pcregrep, for use when it is connected to
40    pipes.
41    
42    
43    Release 8.02 19-Mar-2010
44    ------------------------
45    
46    Another bug-fix release.
47    
48    
49    Release 8.01 19-Jan-2010
50    ------------------------
51    
52    This is a bug-fix release. Several bugs in the code itself and some bugs and
53    infelicities in the build system have been fixed.
54    
55    
56    Release 8.00 19-Oct-09
57    ----------------------
58    
59    Bugs have been fixed in the library and in pcregrep. There are also some
60    enhancements. Restrictions on patterns used for partial matching have been
61    removed, extra information is given for partial matches, the partial matching
62    process has been improved, and an option to make a partial match override a
63    full match is available. The "study" process has been enhanced by finding a
64    lower bound matching length. Groups with duplicate numbers may now have
65    duplicated names without the use of PCRE_DUPNAMES. However, they may not have
66    different names. The documentation has been revised to reflect these changes.
67    The version number has been expanded to 3 digits as it is clear that the rate
68    of change is not slowing down.
69    
70    
71    Release 7.9 11-Apr-09
72    ---------------------
73    
74    Mostly bugfixes and tidies with just a couple of minor functional additions.
75    
76    
77    Release 7.8 05-Sep-08
78    ---------------------
79    
80    More bug fixes, plus a performance improvement in Unicode character property
81    lookup.
82    
83    
84    Release 7.7 07-May-08
85    ---------------------
86    
87    This is once again mainly a bug-fix release, but there are a couple of new
88    features.
89    
90    
91    Release 7.6 28-Jan-08
92    ---------------------
93    
94    The main reason for having this release so soon after 7.5 is because it fixes a
95    potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
96    addition, the CMake configuration files have been brought up to date.
97    
98    
99    Release 7.5 10-Jan-08
100    ---------------------
101    
102    This is mainly a bug-fix release. However the ability to link pcregrep with
103    libz or libbz2 and the ability to link pcretest with libreadline have been
104    added. Also the --line-offsets and --file-offsets options were added to
105    pcregrep.
106    
107    
108    Release 7.4 21-Sep-07
109    ---------------------
110    
111    The only change of specification is the addition of options to control whether
112    \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
113    Otherwise, the changes are bug fixes and a refactoring to reduce the number of
114    relocations needed in a shared library. There have also been some documentation
115    updates, in particular, some more information about using CMake to build PCRE
116    has been added to the NON-UNIX-USE file.
117    
118    
119    Release 7.3 28-Aug-07
120    ---------------------
121    
122    Most changes are bug fixes. Some that are not:
123    
124    1. There is some support for Perl 5.10's experimental "backtracking control
125       verbs" such as (*PRUNE).
126    
127    2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
128       restrictive in the strings it accepts.
129    
130    3. Checking for potential integer overflow has been made more dynamic, and as a
131       consequence there is no longer a hard limit on the size of a subpattern that
132       has a limited repeat count.
133    
134    4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
135       no longer advance by two characters instead of one when an unanchored match
136       fails at CRLF if there are explicit CR or LF matches within the pattern.
137       This gets rid of some anomalous effects that previously occurred.
138    
139    5. Some PCRE-specific settings for varying the newline options at the start of
140       a pattern have been added.
141    
142    
143    Release 7.2 19-Jun-07
144    ---------------------
145    
146    WARNING: saved patterns that were compiled by earlier versions of PCRE must be
147    recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
148    and \V).
149    
150    Correction to the notes for 7.1: the note about shared libraries for Windows is
151    wrong. Previously, three libraries were built, but each could function
152    independently. For example, the pcreposix library also included all the
153    functions from the basic pcre library. The change is that the three libraries
154    are no longer independent. They are like the Unix libraries. To use the
155    pcreposix functions, for example, you need to link with both the pcreposix and
156    the basic pcre library.
157    
158    Some more features from Perl 5.10 have been added:
159    
160      (?-n) and (?+n) relative references for recursion and subroutines.
161    
162      (?(-n) and (?(+n) relative references as conditions.
163    
164      \k{name} and \g{name} are synonyms for \k<name>.
165    
166      \K to reset the start of the matched string; for example, (foo)\Kbar
167      matches bar preceded by foo, but only sets bar as the matched string.
168    
169      (?| introduces a group where the capturing parentheses in each alternative
170      start from the same number; for example, (?|(abc)|(xyz)) sets capturing
171      parentheses number 1 in both cases.
172    
173      \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
174    
175    
176    Release 7.1 24-Apr-07
177    ---------------------
178    
179    There is only one new feature in this release: a linebreak setting of
180    PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
181    recognizes only CRLF, CR, and LF as linebreaks.
182    
183    A few bugs are fixed (see ChangeLog for details), but the major change is a
184    complete re-implementation of the build system. This now has full Autotools
185    support and so is now "standard" in some sense. It should help with compiling
186    PCRE in a wide variety of environments.
187    
188    NOTE: when building shared libraries for Windows, three dlls are now built,
189    called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
190    included in a single dll.
191    
192    Another important change is that the dftables auxiliary program is no longer
193    compiled and run at "make" time by default. Instead, a default set of character
194    tables (assuming ASCII coding) is used. If you want to use dftables to generate
195    the character tables as previously, add --enable-rebuild-chartables to the
196    "configure" command. You must do this if you are compiling PCRE to run on a
197    system that uses EBCDIC code.
198    
199    There is a discussion about character tables in the README file. The default is
200    not to use dftables so that that there is no problem when cross-compiling.
201    
202    
203    Release 7.0 19-Dec-06
204    ---------------------
205    
206    This release has a new major number because there have been some internal
207    upheavals to facilitate the addition of new optimizations and other facilities,
208    and to make subsequent maintenance and extension easier. Compilation is likely
209    to be a bit slower, but there should be no major effect on runtime performance.
210    Previously compiled patterns are NOT upwards compatible with this release. If
211    you have saved compiled patterns from a previous release, you will have to
212    re-compile them. Important changes that are visible to users are:
213    
214    1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
215       some more scripts.
216    
217    2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
218       sequence as a newline.
219    
220    3. The \R escape matches a single Unicode newline sequence as a single unit.
221    
222    4. New features that will appear in Perl 5.10 are now in PCRE. These include
223       alternative Perl syntax for named parentheses, and Perl syntax for
224       recursion.
225    
226    5. The C++ wrapper interface has been extended by the addition of a
227       QuoteMeta function and the ability to allow copy construction and
228       assignment.
229    
230    For a complete list of changes, see the ChangeLog file.
231    
232    
233    Release 6.7 04-Jul-06
234    ---------------------
235    
236    The main additions to this release are the ability to use the same name for
237    multiple sets of parentheses, and support for CRLF line endings in both the
238    library and pcregrep (and in pcretest for testing).
239    
240    Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
241    significantly reduced for certain subject strings.
242    
243    
244    Release 6.5 01-Feb-06
245    ---------------------
246    
247    Important changes in this release:
248    
249    1. A number of new features have been added to pcregrep.
250    
251    2. The Unicode property tables have been updated to Unicode 4.1.0, and the
252       supported properties have been extended with script names such as "Arabic",
253       and the derived properties "Any" and "L&". This has necessitated a change to
254       the interal format of compiled patterns. Any saved compiled patterns that
255       use \p or \P must be recompiled.
256    
257    3. The specification of recursion in patterns has been changed so that all
258       recursive subpatterns are automatically treated as atomic groups. Thus, for
259       example, (?R) is treated as if it were (?>(?R)). This is necessary because
260       otherwise there are situations where recursion does not work.
261    
262    See the ChangeLog for a complete list of changes, which include a number of bug
263    fixes and tidies.
264    
265    
266    Release 6.0 07-Jun-05
267    ---------------------
268    
269    The release number has been increased to 6.0 because of the addition of several
270    major new pieces of functionality.
271    
272    A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
273    algorithm, has been added. This has a number of advantages for certain cases,
274    though it does run more slowly, and lacks the ability to capture substrings. On
275    the other hand, it does find all matches, not just the first, and it works
276    better for partial matching. The pcrematching man page discusses the
277    differences.
278    
279    The pcretest program has been enhanced so that it can make use of the new
280    pcre_dfa_exec() matching function and the extra features it provides.
281    
282    The distribution now includes a C++ wrapper library. This is built
283    automatically if a C++ compiler is found. The pcrecpp man page discusses this
284    interface.
285    
286    The code itself has been re-organized into many more files, one for each
287    function, so it no longer requires everything to be linked in when static
288    linkage is used. As a consequence, some internal functions have had to have
289    their names exposed. These functions all have names starting with _pcre_. They
290    are undocumented, and are not intended for use by outside callers.
291    
292    The pcregrep program has been enhanced with new functionality such as
293    multiline-matching and options for output more matching context. See the
294    ChangeLog for a complete list of changes to the library and the utility
295    programs.
296    
297    
298    Release 5.0 13-Sep-04
299    ---------------------
300    
301    The licence under which PCRE is released has been changed to the more
302    conventional "BSD" licence.
303    
304    In the code, some bugs have been fixed, and there are also some major changes
305    in this release (which is why I've increased the number to 5.0). Some changes
306    are internal rearrangements, and some provide a number of new facilities. The
307    new features are:
308    
309    1. There's an "automatic callout" feature that inserts callouts before every
310       item in the regex, and there's a new callout field that gives the position
311       in the pattern - useful for debugging and tracing.
312    
313    2. The extra_data structure can now be used to pass in a set of character
314       tables at exec time. This is useful if compiled regex are saved and re-used
315       at a later time when the tables may not be at the same address. If the
316       default internal tables are used, the pointer saved with the compiled
317       pattern is now set to NULL, which means that you don't need to do anything
318       special unless you are using custom tables.
319    
320    3. It is possible, with some restrictions on the content of the regex, to
321       request "partial" matching. A special return code is given if all of the
322       subject string matched part of the regex. This could be useful for testing
323       an input field as it is being typed.
324    
325    4. There is now some optional support for Unicode character properties, which
326       means that the patterns items such as \p{Lu} and \X can now be used. Only
327       the general category properties are supported. If PCRE is compiled with this
328       support, an additional 90K data structure is include, which increases the
329       size of the library dramatically.
330    
331    5. There is support for saving compiled patterns and re-using them later.
332    
333    6. There is support for running regular expressions that were compiled on a
334       different host with the opposite endianness.
335    
336    7. The pcretest program has been extended to accommodate the new features.
337    
338    The main internal rearrangement is that sequences of literal characters are no
339    longer handled as strings. Instead, each character is handled on its own. This
340    makes some UTF-8 handling easier, and makes the support of partial matching
341    possible. Compiled patterns containing long literal strings will be larger as a
342    result of this change; I hope that performance will not be much affected.
343    
344    
345    Release 4.5 01-Dec-03
346    ---------------------
347    
348    Again mainly a bug-fix and tidying release, with only a couple of new features:
349    
350    1. It's possible now to compile PCRE so that it does not use recursive
351    function calls when matching. Instead it gets memory from the heap. This slows
352    things down, but may be necessary on systems with limited stacks.
353    
354    2. UTF-8 string checking has been tightened to reject overlong sequences and to
355    check that a starting offset points to the start of a character. Failure of the
356    latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
357    
358    3. PCRE can now be compiled for systems that use EBCDIC code.
359    
360    
361    Release 4.4 21-Aug-03
362    ---------------------
363    
364    This is mainly a bug-fix and tidying release. The only new feature is that PCRE
365    checks UTF-8 strings for validity by default. There is an option to suppress
366    this, just in case anybody wants that teeny extra bit of performance.
367    
368    
369    Releases 4.1 - 4.3
370    ------------------
371    
372    Sorry, I forgot about updating the NEWS file for these releases. Please take a
373    look at ChangeLog.
374    
375    
376    Release 4.0 17-Feb-03
377    ---------------------
378    
379    There have been a lot of changes for the 4.0 release, adding additional
380    functionality and mending bugs. Below is a list of the highlights of the new
381    functionality. For full details of these features, please consult the
382    documentation. For a complete list of changes, see the ChangeLog file.
383    
384    1. Support for Perl's \Q...\E escapes.
385    
386    2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
387    package. They provide some syntactic sugar for simple cases of "atomic
388    grouping".
389    
390    3. Support for the \G assertion. It is true when the current matching position
391    is at the start point of the match.
392    
393    4. A new feature that provides some of the functionality that Perl provides
394    with (?{...}). The facility is termed a "callout". The way it is done in PCRE
395    is for the caller to provide an optional function, by setting pcre_callout to
396    its entry point. To get the function called, the regex must include (?C) at
397    appropriate points.
398    
399    5. Support for recursive calls to individual subpatterns. This makes it really
400    easy to get totally confused.
401    
402    6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
403    name a group.
404    
405    7. Several extensions to UTF-8 support; it is now fairly complete. There is an
406    option for pcregrep to make it operate in UTF-8 mode.
407    
408    8. The single man page has been split into a number of separate man pages.
409    These also give rise to individual HTML pages which are put in a separate
410    directory. There is an index.html page that lists them all. Some hyperlinking
411    between the pages has been installed.
412    
413    
414    Release 3.5 15-Aug-01
415    ---------------------
416    
417    1. The configuring system has been upgraded to use later versions of autoconf
418    and libtool. By default it builds both a shared and a static library if the OS
419    supports it. You can use --disable-shared or --disable-static on the configure
420    command if you want only one of them.
421    
422    2. The pcretest utility is now installed along with pcregrep because it is
423    useful for users (to test regexs) and by doing this, it automatically gets
424    relinked by libtool. The documentation has been turned into a man page, so
425    there are now .1, .txt, and .html versions in /doc.
426    
427    3. Upgrades to pcregrep:
428       (i)   Added long-form option names like gnu grep.
429       (ii)  Added --help to list all options with an explanatory phrase.
430       (iii) Added -r, --recursive to recurse into sub-directories.
431       (iv)  Added -f, --file to read patterns from a file.
432    
433    4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
434    script, to force use of CR or LF instead of \n in the source. On non-Unix
435    systems, the value can be set in config.h.
436    
437    5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
438    absolute limit. Changed the text of the error message to make this clear, and
439    likewise updated the man page.
440    
441    6. The limit of 99 on the number of capturing subpatterns has been removed.
442    The new limit is 65535, which I hope will not be a "real" limit.
443    
444    
445  Release 3.3 01-Aug-00  Release 3.3 01-Aug-00
446  ---------------------  ---------------------
447    

Legend:
Removed from v.49  
changed lines
  Added in v.589

  ViewVC Help
Powered by ViewVC 1.1.5