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revision 21 by nigel, Sat Feb 24 21:38:37 2007 UTC revision 45 by nigel, Sat Feb 24 21:39:25 2007 UTC
# Line 2  ChangeLog for PCRE Line 2  ChangeLog for PCRE
2  ------------------  ------------------
3    
4    
5  Version 1.09 28 Apr-98  Version 3.1 09-Feb-00
6    ---------------------
7    
8    The only change in this release is the fixing of some bugs in Makefile.in for
9    the "install" target:
10    
11    (1) It was failing to install pcreposix.h.
12    
13    (2) It was overwriting the pcre.3 man page with the pcreposix.3 man page.
14    
15    
16    Version 3.0 01-Feb-00
17    ---------------------
18    
19    1. Add support for the /+ modifier to perltest (to output $` like it does in
20    pcretest).
21    
22    2. Add support for the /g modifier to perltest.
23    
24    3. Fix pcretest so that it behaves even more like Perl for /g when the pattern
25    matches null strings.
26    
27    4. Fix perltest so that it doesn't do unwanted things when fed an empty
28    pattern. Perl treats empty patterns specially - it reuses the most recent
29    pattern, which is not what we want. Replace // by /(?#)/ in order to avoid this
30    effect.
31    
32    5. The POSIX interface was broken in that it was just handing over the POSIX
33    captured string vector to pcre_exec(), but (since release 2.00) PCRE has
34    required a bigger vector, with some working space on the end. This means that
35    the POSIX wrapper now has to get and free some memory, and copy the results.
36    
37    6. Added some simple autoconf support, placing the test data and the
38    documentation in separate directories, re-organizing some of the
39    information files, and making it build pcre-config (a GNU standard). Also added
40    libtool support for building PCRE as a shared library, which is now the
41    default.
42    
43    7. Got rid of the leading zero in the definition of PCRE_MINOR because 08 and
44    09 are not valid octal constants. Single digits will be used for minor values
45    less than 10.
46    
47    8. Defined REG_EXTENDED and REG_NOSUB as zero in the POSIX header, so that
48    existing programs that set these in the POSIX interface can use PCRE without
49    modification.
50    
51    9. Added a new function, pcre_fullinfo() with an extensible interface. It can
52    return all that pcre_info() returns, plus additional data. The pcre_info()
53    function is retained for compatibility, but is considered to be obsolete.
54    
55    10. Added experimental recursion feature (?R) to handle one common case that
56    Perl 5.6 will be able to do with (?p{...}).
57    
58    11. Added support for POSIX character classes like [:alpha:], which Perl is
59    adopting.
60    
61    
62    Version 2.08 31-Aug-99
63    ----------------------
64    
65    1. When startoffset was not zero and the pattern began with ".*", PCRE was not
66    trying to match at the startoffset position, but instead was moving forward to
67    the next newline as if a previous match had failed.
68    
69    2. pcretest was not making use of PCRE_NOTEMPTY when repeating for /g and /G,
70    and could get into a loop if a null string was matched other than at the start
71    of the subject.
72    
73    3. Added definitions of PCRE_MAJOR and PCRE_MINOR to pcre.h so the version can
74    be distinguished at compile time, and for completeness also added PCRE_DATE.
75    
76    5. Added Paul Sokolovsky's minor changes to make it easy to compile a Win32 DLL
77    in GnuWin32 environments.
78    
79    
80    Version 2.07 29-Jul-99
81    ----------------------
82    
83    1. The documentation is now supplied in plain text form and HTML as well as in
84    the form of man page sources.
85    
86    2. C++ compilers don't like assigning (void *) values to other pointer types.
87    In particular this affects malloc(). Although there is no problem in Standard
88    C, I've put in casts to keep C++ compilers happy.
89    
90    3. Typo on pcretest.c; a cast of (unsigned char *) in the POSIX regexec() call
91    should be (const char *).
92    
93    4. If NOPOSIX is defined, pcretest.c compiles without POSIX support. This may
94    be useful for non-Unix systems who don't want to bother with the POSIX stuff.
95    However, I haven't made this a standard facility. The documentation doesn't
96    mention it, and the Makefile doesn't support it.
97    
98    5. The Makefile now contains an "install" target, with editable destinations at
99    the top of the file. The pcretest program is not installed.
100    
101    6. pgrep -V now gives the PCRE version number and date.
102    
103    7. Fixed bug: a zero repetition after a literal string (e.g. /abcde{0}/) was
104    causing the entire string to be ignored, instead of just the last character.
105    
106    8. If a pattern like /"([^\\"]+|\\.)*"/ is applied in the normal way to a
107    non-matching string, it can take a very, very long time, even for strings of
108    quite modest length, because of the nested recursion. PCRE now does better in
109    some of these cases. It does this by remembering the last required literal
110    character in the pattern, and pre-searching the subject to ensure it is present
111    before running the real match. In other words, it applies a heuristic to detect
112    some types of certain failure quickly, and in the above example, if presented
113    with a string that has no trailing " it gives "no match" very quickly.
114    
115    9. A new runtime option PCRE_NOTEMPTY causes null string matches to be ignored;
116    other alternatives are tried instead.
117    
118    
119    Version 2.06 09-Jun-99
120    ----------------------
121    
122    1. Change pcretest's output for amount of store used to show just the code
123    space, because the remainder (the data block) varies in size between 32-bit and
124    64-bit systems.
125    
126    2. Added an extra argument to pcre_exec() to supply an offset in the subject to
127    start matching at. This allows lookbehinds to work when searching for multiple
128    occurrences in a string.
129    
130    3. Added additional options to pcretest for testing multiple occurrences:
131    
132       /+   outputs the rest of the string that follows a match
133       /g   loops for multiple occurrences, using the new startoffset argument
134       /G   loops for multiple occurrences by passing an incremented pointer
135    
136    4. PCRE wasn't doing the "first character" optimization for patterns starting
137    with \b or \B, though it was doing it for other lookbehind assertions. That is,
138    it wasn't noticing that a match for a pattern such as /\bxyz/ has to start with
139    the letter 'x'. On long subject strings, this gives a significant speed-up.
140    
141    
142    Version 2.05 21-Apr-99
143    ----------------------
144    
145    1. Changed the type of magic_number from int to long int so that it works
146    properly on 16-bit systems.
147    
148    2. Fixed a bug which caused patterns starting with .* not to work correctly
149    when the subject string contained newline characters. PCRE was assuming
150    anchoring for such patterns in all cases, which is not correct because .* will
151    not pass a newline unless PCRE_DOTALL is set. It now assumes anchoring only if
152    DOTALL is set at top level; otherwise it knows that patterns starting with .*
153    must be retried after every newline in the subject.
154    
155    
156    Version 2.04 18-Feb-99
157    ----------------------
158    
159    1. For parenthesized subpatterns with repeats whose minimum was zero, the
160    computation of the store needed to hold the pattern was incorrect (too large).
161    If such patterns were nested a few deep, this could multiply and become a real
162    problem.
163    
164    2. Added /M option to pcretest to show the memory requirement of a specific
165    pattern. Made -m a synonym of -s (which does this globally) for compatibility.
166    
167    3. Subpatterns of the form (regex){n,m} (i.e. limited maximum) were being
168    compiled in such a way that the backtracking after subsequent failure was
169    pessimal. Something like (a){0,3} was compiled as (a)?(a)?(a)? instead of
170    ((a)((a)(a)?)?)? with disastrous performance if the maximum was of any size.
171    
172    
173    Version 2.03 02-Feb-99
174    ----------------------
175    
176    1. Fixed typo and small mistake in man page.
177    
178    2. Added 4th condition (GPL supersedes if conflict) and created separate
179    LICENCE file containing the conditions.
180    
181    3. Updated pcretest so that patterns such as /abc\/def/ work like they do in
182    Perl, that is the internal \ allows the delimiter to be included in the
183    pattern. Locked out the use of \ as a delimiter. If \ immediately follows
184    the final delimiter, add \ to the end of the pattern (to test the error).
185    
186    4. Added the convenience functions for extracting substrings after a successful
187    match. Updated pcretest to make it able to test these functions.
188    
189    
190    Version 2.02 14-Jan-99
191    ----------------------
192    
193    1. Initialized the working variables associated with each extraction so that
194    their saving and restoring doesn't refer to uninitialized store.
195    
196    2. Put dummy code into study.c in order to trick the optimizer of the IBM C
197    compiler for OS/2 into generating correct code. Apparently IBM isn't going to
198    fix the problem.
199    
200    3. Pcretest: the timing code wasn't using LOOPREPEAT for timing execution
201    calls, and wasn't printing the correct value for compiling calls. Increased the
202    default value of LOOPREPEAT, and the number of significant figures in the
203    times.
204    
205    4. Changed "/bin/rm" in the Makefile to "-rm" so it works on Windows NT.
206    
207    5. Renamed "deftables" as "dftables" to get it down to 8 characters, to avoid
208    a building problem on Windows NT with a FAT file system.
209    
210    
211    Version 2.01 21-Oct-98
212    ----------------------
213    
214    1. Changed the API for pcre_compile() to allow for the provision of a pointer
215    to character tables built by pcre_maketables() in the current locale. If NULL
216    is passed, the default tables are used.
217    
218    
219    Version 2.00 24-Sep-98
220    ----------------------
221    
222    1. Since the (>?) facility is in Perl 5.005, don't require PCRE_EXTRA to enable
223    it any more.
224    
225    2. Allow quantification of (?>) groups, and make it work correctly.
226    
227    3. The first character computation wasn't working for (?>) groups.
228    
229    4. Correct the implementation of \Z (it is permitted to match on the \n at the
230    end of the subject) and add 5.005's \z, which really does match only at the
231    very end of the subject.
232    
233    5. Remove the \X "cut" facility; Perl doesn't have it, and (?> is neater.
234    
235    6. Remove the ability to specify CASELESS, MULTILINE, DOTALL, and
236    DOLLAR_END_ONLY at runtime, to make it possible to implement the Perl 5.005
237    localized options. All options to pcre_study() were also removed.
238    
239    7. Add other new features from 5.005:
240    
241       $(?<=           positive lookbehind
242       $(?<!           negative lookbehind
243       (?imsx-imsx)    added the unsetting capability
244                       such a setting is global if at outer level; local otherwise
245       (?imsx-imsx:)   non-capturing groups with option setting
246       (?(cond)re|re)  conditional pattern matching
247    
248       A backreference to itself in a repeated group matches the previous
249       captured string.
250    
251    8. General tidying up of studying (both automatic and via "study")
252    consequential on the addition of new assertions.
253    
254    9. As in 5.005, unlimited repeated groups that could match an empty substring
255    are no longer faulted at compile time. Instead, the loop is forcibly broken at
256    runtime if any iteration does actually match an empty substring.
257    
258    10. Include the RunTest script in the distribution.
259    
260    11. Added tests from the Perl 5.005_02 distribution. This showed up a few
261    discrepancies, some of which were old and were also with respect to 5.004. They
262    have now been fixed.
263    
264    
265    Version 1.09 28-Apr-98
266  ----------------------  ----------------------
267    
268  1. A negated single character class followed by a quantifier with a minimum  1. A negated single character class followed by a quantifier with a minimum

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