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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.02 01-Mar-2010  Version 8.12 12-Jan-2011
5    ------------------------
7    1.  Fixed some typos in the markup of the man pages, and wrote a script that
8        checks for such things as part of the documentation building process.
10    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
11        --match-limit and --recursion-limit options (added for 8.11). In
12        particular, this made one of the standard tests crash. (The integer value
13        went into the wrong half of a long int.)
15    3.  If the --colour option was given to pcregrep with -v (invert match), it
16        did strange things, either producing crazy output, or crashing. It should,
17        of course, ignore a request for colour when reporting lines that do not
18        match.
20    4.  If pcregrep was compiled under Windows, there was a reference to the
21        function pcregrep_exit() before it was defined. I am assuming this was
22        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
23        reported by a user. I've moved the definition above the reference.
26    Version 8.11 10-Dec-2010
27    ------------------------
29    1.  (*THEN) was not working properly if there were untried alternatives prior
30        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
31        backtracked to try for "b" instead of moving to the next alternative branch
32        at the same level (in this case, to look for "c"). The Perl documentation
33        is clear that when (*THEN) is backtracked onto, it goes to the "next
34        alternative in the innermost enclosing group".
36    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
37        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
38        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
39        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
40        (*THEN).
42    3.  If \s appeared in a character class, it removed the VT character from
43        the class, even if it had been included by some previous item, for example
44        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
45        of \s, but is part of the POSIX "space" class.)
47    4.  A partial match never returns an empty string (because you can always
48        match an empty string at the end of the subject); however the checking for
49        an empty string was starting at the "start of match" point. This has been
50        changed to the "earliest inspected character" point, because the returned
51        data for a partial match starts at this character. This means that, for
52        example, /(?<=abc)def/ gives a partial match for the subject "abc"
53        (previously it gave "no match").
55    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
56        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
57        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
58        has an implication that the given string is incomplete (because a partial
59        match is preferred over a full match). For this reason, these items now
60        give a partial match in this situation. [Aside: previously, the one case
61        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
62        match rather than a full match, which was wrong by the old rules, but is
63        now correct.]
65    6.  There was a bug in the handling of #-introduced comments, recognized when
66        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
67        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
68        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
69        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
70        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
71        places in pcre_compile().
73    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
74        comments when looking ahead for named forward references to subpatterns,
75        the only newline sequence it recognized was NL. It now handles newlines
76        according to the set newline convention.
78    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
79        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
80        cater for a lack of strerror(). These oversights have been fixed.
82    9.  Added --match-limit and --recursion-limit to pcregrep.
84    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
86    11. When the -o option was used, pcregrep was setting a return code of 1, even
87        when matches were found, and --line-buffered was not being honoured.
89    12. Added an optional parentheses number to the -o and --only-matching options
90        of pcregrep.
92    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
93        can match an empty string. The code to do it in pcretest and pcredemo
94        needed fixing:
96        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
97            only one byte after an empty string match just before CRLF (this case
98            just got forgotten; "any" and "anycrlf" were OK).
100        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
101            mode when an empty string match preceded an ASCII character followed by
102            a non-ASCII character. (The code for advancing by one character rather
103            than one byte was nonsense.)
105        (c) The pcredemo.c sample program did not have any code at all to handle
106            the cases when CRLF is a valid newline sequence.
108    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
109        as a starting offset was within the subject string. There is now a new
110        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
111        negative or greater than the length of the string. In order to test this,
112        pcretest is extended to allow the setting of negative starting offsets.
114    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
115        starting offset points to the beginning of a UTF-8 character was
116        unnecessarily clumsy. I tidied it up.
118    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
119        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
121    17. Nobody had reported that the --include_dir option, which was added in
122        release 7.7 should have been called --include-dir (hyphen, not underscore)
123        for compatibility with GNU grep. I have changed it to --include-dir, but
124        left --include_dir as an undocumented synonym, and the same for
125        --exclude-dir, though that is not available in GNU grep, at least as of
126        release 2.5.4.
128    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
129        characters from a string of bytes) have been redefined so as not to use
130        loops, in order to improve performance in some environments. At the same
131        time, I abstracted some of the common code into auxiliary macros to save
132        repetition (this should not affect the compiled code).
134    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
135        compile-time error is now given if \c is not followed by an ASCII
136        character, that is, a byte less than 128. (In EBCDIC mode, the code is
137        different, and any byte value is allowed.)
139    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
140        START_OPTIMIZE option, which is now allowed at compile time - but just
141        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
142        to pcregrep and other applications that have no direct access to PCRE
143        options. The new /Y option in pcretest sets this option when calling
144        pcre_compile().
146    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
147        back references. Groups containing recursive back references were forced to
148        be atomic by that change, but in the case of named groups, the amount of
149        memory required was incorrectly computed, leading to "Failed: internal
150        error: code overflow". This has been fixed.
152    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
153        pcretest.c, to avoid build problems in some Borland environments.
156    Version 8.10 25-Jun-2010
157    ------------------------
159    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
160        THEN.
162    2.  (*ACCEPT) was not working when inside an atomic group.
164    3.  Inside a character class, \B is treated as a literal by default, but
165        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
166        causes the error). The code is unchanged, but I tidied the documentation.
168    4.  Inside a character class, PCRE always treated \R and \X as literals,
169        whereas Perl faults them if its -w option is set. I have changed PCRE so
170        that it faults them when PCRE_EXTRA is set.
172    5.  Added support for \N, which always matches any character other than
173        newline. (It is the same as "." when PCRE_DOTALL is not set.)
175    6.  When compiling pcregrep with newer versions of gcc which may have
176        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
177        declared with attribute warn_unused_result" were given. Just casting the
178        result to (void) does not stop the warnings; a more elaborate fudge is
179        needed. I've used a macro to implement this.
181    7.  Minor change to pcretest.c to avoid a compiler warning.
183    8.  Added four artifical Unicode properties to help with an option to make
184        \s etc use properties (see next item). The new properties are: Xan
185        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
187    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
188        use Unicode properties. (*UCP) at the start of a pattern can be used to set
189        this option. Modified pcretest to add /W to test this facility. Added
190        REG_UCP to make it available via the POSIX interface.
192    10. Added --line-buffered to pcregrep.
194    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
195        studied, and the match started with a letter with a code point greater than
196        127 whose first byte was different to the first byte of the other case of
197        the letter, the other case of this starting letter was not recognized
198        (#976).
200    12. If a pattern that was studied started with a repeated Unicode property
201        test, for example, \p{Nd}+, there was the theoretical possibility of
202        setting up an incorrect bitmap of starting bytes, but fortunately it could
203        not have actually happened in practice until change 8 above was made (it
204        added property types that matched character-matching opcodes).
206    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
207        possible starting bytes for non-anchored patterns.
209    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
210        \R, and also a number of cases that involve Unicode properties, both
211        explicit and implicit when PCRE_UCP is set.
213    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
214        input, it could crash or give wrong results if characters with values
215        greater than 0xc0 were present in the subject string. (Detail: it assumed
216        UTF-8 input when processing these items.)
218    16. Added a lot of (int) casts to avoid compiler warnings in systems where
219        size_t is 64-bit (#991).
221    17. Added a check for running out of memory when PCRE is compiled with
222        --disable-stack-for-recursion (#990).
224    18. If the last data line in a file for pcretest does not have a newline on
225        the end, a newline was missing in the output.
227    19. The default pcre_chartables.c file recognizes only ASCII characters (values
228        less than 128) in its various bitmaps. However, there is a facility for
229        generating tables according to the current locale when PCRE is compiled. It
230        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
231        characters, are recognized by isspace() and therefore were getting set in
232        these tables, and indeed these tables seem to approximate to ISO 8859. This
233        caused a problem in UTF-8 mode when pcre_study() was used to create a list
234        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
235        which of course cannot start UTF-8 characters. I have changed the code so
236        that only real ASCII characters (less than 128) and the correct starting
237        bytes for UTF-8 encodings are set for characters greater than 127 when in
238        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
239        altogether.)
241    20. Added the /T option to pcretest so as to be able to run tests with non-
242        standard character tables, thus making it possible to include the tests
243        used for 19 above in the standard set of tests.
245    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
246        reference to a subpattern the other side of a comment that contains an
247        opening parenthesis caused either an internal compiling error, or a
248        reference to the wrong subpattern.
251    Version 8.02 19-Mar-2010
252  ------------------------  ------------------------
254  1.  The Unicode data tables have been updated to Unicode 5.2.0.  1.  The Unicode data tables have been updated to Unicode 5.2.0.
256    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
257        configured.
259    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
260        original author of that file, following a query about its status.
262    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
263        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
265    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
266        quantifier applied to a forward-referencing subroutine call, could compile
267        incorrect code or give the error "internal error: previously-checked
268        referenced subpattern not found".
270    6.  Both MS Visual Studio and Symbian OS have problems with initializing
271        variables to point to external functions. For these systems, therefore,
272        pcre_malloc etc. are now initialized to local functions that call the
273        relevant global functions.
275    7.  There were two entries missing in the vectors called coptable and poptable
276        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
277        I've fixed the data, and added a kludgy way of testing at compile time that
278        the lengths are correct (equal to the number of opcodes).
280    8.  Following on from 7, I added a similar kludge to check the length of the
281        eint vector in pcreposix.c.
283    9.  Error texts for pcre_compile() are held as one long string to avoid too
284        much relocation at load time. To find a text, the string is searched,
285        counting zeros. There was no check for running off the end of the string,
286        which could happen if a new error number was added without updating the
287        string.
289    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
291    11. \K was not working if it appeared in an atomic group or in a group that
292        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
293        \K is "not well defined" if used in an assertion. PCRE now accepts it if
294        the assertion is positive, but not if it is negative.
296    12. Change 11 fortuitously reduced the size of the stack frame used in the
297        "match()" function of pcre_exec.c by one pointer. Forthcoming
298        implementation of support for (*MARK) will need an extra pointer on the
299        stack; I have reserved it now, so that the stack frame size does not
300        decrease.
302    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
303        item in branch that calls a recursion is a subroutine call - as in the
304        second branch in the above example - was incorrectly given the compile-
305        time error "recursive call could loop indefinitely" because pcre_compile()
306        was not correctly checking the subroutine for matching a non-empty string.
308    14. The checks for overrunning compiling workspace could trigger after an
309        overrun had occurred. This is a "should never occur" error, but it can be
310        triggered by pathological patterns such as hundreds of nested parentheses.
311        The checks now trigger 100 bytes before the end of the workspace.
313    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
316  Version 8.01 19-Jan-2010  Version 8.01 19-Jan-2010
317  ------------------------  ------------------------

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