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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.00 ??-???-??  Version 8.13 30-Apr-2011
5    ------------------------
7    1.  The Unicode data tables have been updated to Unicode 6.0.0.
9    2.  Two minor typos in pcre_internal.h have been fixed.
11    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
12        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
13        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
15    4.  There were a number of related bugs in the code for matching backrefences
16        caselessly in UTF-8 mode when codes for the characters concerned were
17        different numbers of bytes. For example, U+023A and U+2C65 are an upper
18        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
19        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
20        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
21        2-byte code at the end of the subject (it thought there wasn't enough data
22        left).
24    5.  Comprehensive information about what went wrong is now returned by
25        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
26        as the output vector has at least 2 elements. The offset of the start of
27        the failing character and a reason code are placed in the vector.
29    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
30        now returned is for the first byte of the failing character, instead of the
31        last byte inspected. This is an incompatible change, but I hope it is small
32        enough not to be a problem. It makes the returned offset consistent with
33        pcre_exec() and pcre_dfa_exec().
35    7.  pcretest now gives a text phrase as well as the error number when
36        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
37        failure, the offset and reason code are output.
39    8.  When \R was used with a maximizing quantifier it failed to skip backwards
40        over a \r\n pair if the subsequent match failed. Instead, it just skipped
41        back over a single character (\n). This seems wrong (because it treated the
42        two characters as a single entity when going forwards), conflicts with the
43        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
44        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
45        has been changed.
47    9.  Some internal refactoring has changed the processing so that the handling
48        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
49        time (the PCRE_DOTALL option was changed this way some time ago: version
50        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
51        which was always a bit of a fudge. It also means that there is one less
52        argument for the match() function, which reduces its stack requirements
53        slightly. This change also fixes an incompatibility with Perl: the pattern
54        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
56    10. More internal refactoring has drastically reduced the number of recursive
57        calls to match() for possessively repeated groups such as (abc)++ when
58        using pcre_exec().
60    11. While implementing 10, a number of bugs in the handling of groups were
61        discovered and fixed:
63        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
64        (a|)*(?1) gave a compile-time internal error.
65        ((a|)+)+  did not notice that the outer group could match an empty string.
66        (^a|^)+   was not marked as anchored.
67        (.*a|.*)+ was not marked as matching at start or after a newline.
69    12. Yet more internal refactoring has removed another argument from the match()
70        function. Special calls to this function are now indicated by setting a
71        value in a variable in the "match data" data block.
73    13. Be more explicit in pcre_study() instead of relying on "default" for
74        opcodes that mean there is no starting character; this means that when new
75        ones are added and accidentally left out of pcre_study(), testing should
76        pick them up.
78    14. The -s option of pcretest has been documented for ages as being an old
79        synonym of -m (show memory usage). I have changed it to mean "force study
80        for every regex", that is, assume /S for every regex. This is similar to -i
81        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
82        using it. It makes it easier to run collection of tests with study enabled,
83        and thereby test pcre_study() more easily.
85    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
86        restoration of the capturing data to the outer values was not happening
87        correctly.
89    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
90        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
91        pattern had matched an empty string, and so incorrectly returned a no
92        match.
94    17. There was optimizing code for the last branch of non-capturing parentheses,
95        and also for the obeyed branch of a conditional subexpression, which used
96        tail recursion to cut down on stack usage. Unfortunately, not that there is
97        the possibility of (*THEN) occurring in these branches, tail recursion is
98        no longer possible because the return has to be checked for (*THEN). These
99        two optimizations have therefore been removed.
101    18. If a pattern containing \R was studied, it was assumed that \R always
102        matched two bytes, thus causing the minimum subject length to be
103        incorrectly computed because \R can also match just one byte.
106    Version 8.12 15-Jan-2011
107    ------------------------
109    1.  Fixed some typos in the markup of the man pages, and wrote a script that
110        checks for such things as part of the documentation building process.
112    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
113        --match-limit and --recursion-limit options (added for 8.11). In
114        particular, this made one of the standard tests fail. (The integer value
115        went into the wrong half of a long int.)
117    3.  If the --colour option was given to pcregrep with -v (invert match), it
118        did strange things, either producing crazy output, or crashing. It should,
119        of course, ignore a request for colour when reporting lines that do not
120        match.
122    4.  Another pcregrep bug caused similar problems if --colour was specified with
123        -M (multiline) and the pattern match finished with a line ending.
125    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
126        matched in multiline mode, the following line was shown as part of the
127        match. This seems wrong, so I have changed it.
129    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
130        the check for further matches in the same line (so they could be coloured)
131        to overrun the end of the current line. If another match was found, it was
132        incorrectly shown (and then shown again when found in the next line).
134    7.  If pcregrep was compiled under Windows, there was a reference to the
135        function pcregrep_exit() before it was defined. I am assuming this was
136        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
137        reported by a user. I've moved the definition above the reference.
140    Version 8.11 10-Dec-2010
141    ------------------------
143    1.  (*THEN) was not working properly if there were untried alternatives prior
144        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
145        backtracked to try for "b" instead of moving to the next alternative branch
146        at the same level (in this case, to look for "c"). The Perl documentation
147        is clear that when (*THEN) is backtracked onto, it goes to the "next
148        alternative in the innermost enclosing group".
150    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
151        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
152        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
153        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
154        (*THEN).
156    3.  If \s appeared in a character class, it removed the VT character from
157        the class, even if it had been included by some previous item, for example
158        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
159        of \s, but is part of the POSIX "space" class.)
161    4.  A partial match never returns an empty string (because you can always
162        match an empty string at the end of the subject); however the checking for
163        an empty string was starting at the "start of match" point. This has been
164        changed to the "earliest inspected character" point, because the returned
165        data for a partial match starts at this character. This means that, for
166        example, /(?<=abc)def/ gives a partial match for the subject "abc"
167        (previously it gave "no match").
169    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
170        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
171        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
172        has an implication that the given string is incomplete (because a partial
173        match is preferred over a full match). For this reason, these items now
174        give a partial match in this situation. [Aside: previously, the one case
175        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
176        match rather than a full match, which was wrong by the old rules, but is
177        now correct.]
179    6.  There was a bug in the handling of #-introduced comments, recognized when
180        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
181        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
182        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
183        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
184        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
185        places in pcre_compile().
187    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
188        comments when looking ahead for named forward references to subpatterns,
189        the only newline sequence it recognized was NL. It now handles newlines
190        according to the set newline convention.
192    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
193        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
194        cater for a lack of strerror(). These oversights have been fixed.
196    9.  Added --match-limit and --recursion-limit to pcregrep.
198    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
200    11. When the -o option was used, pcregrep was setting a return code of 1, even
201        when matches were found, and --line-buffered was not being honoured.
203    12. Added an optional parentheses number to the -o and --only-matching options
204        of pcregrep.
206    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
207        can match an empty string. The code to do it in pcretest and pcredemo
208        needed fixing:
210        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
211            only one byte after an empty string match just before CRLF (this case
212            just got forgotten; "any" and "anycrlf" were OK).
214        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
215            mode when an empty string match preceded an ASCII character followed by
216            a non-ASCII character. (The code for advancing by one character rather
217            than one byte was nonsense.)
219        (c) The pcredemo.c sample program did not have any code at all to handle
220            the cases when CRLF is a valid newline sequence.
222    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
223        as a starting offset was within the subject string. There is now a new
224        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
225        negative or greater than the length of the string. In order to test this,
226        pcretest is extended to allow the setting of negative starting offsets.
228    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
229        starting offset points to the beginning of a UTF-8 character was
230        unnecessarily clumsy. I tidied it up.
232    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
233        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
235    17. Nobody had reported that the --include_dir option, which was added in
236        release 7.7 should have been called --include-dir (hyphen, not underscore)
237        for compatibility with GNU grep. I have changed it to --include-dir, but
238        left --include_dir as an undocumented synonym, and the same for
239        --exclude-dir, though that is not available in GNU grep, at least as of
240        release 2.5.4.
242    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
243        characters from a string of bytes) have been redefined so as not to use
244        loops, in order to improve performance in some environments. At the same
245        time, I abstracted some of the common code into auxiliary macros to save
246        repetition (this should not affect the compiled code).
248    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
249        compile-time error is now given if \c is not followed by an ASCII
250        character, that is, a byte less than 128. (In EBCDIC mode, the code is
251        different, and any byte value is allowed.)
253    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
254        START_OPTIMIZE option, which is now allowed at compile time - but just
255        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
256        to pcregrep and other applications that have no direct access to PCRE
257        options. The new /Y option in pcretest sets this option when calling
258        pcre_compile().
260    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
261        back references. Groups containing recursive back references were forced to
262        be atomic by that change, but in the case of named groups, the amount of
263        memory required was incorrectly computed, leading to "Failed: internal
264        error: code overflow". This has been fixed.
266    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
267        pcretest.c, to avoid build problems in some Borland environments.
270    Version 8.10 25-Jun-2010
271    ------------------------
273    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
274        THEN.
276    2.  (*ACCEPT) was not working when inside an atomic group.
278    3.  Inside a character class, \B is treated as a literal by default, but
279        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
280        causes the error). The code is unchanged, but I tidied the documentation.
282    4.  Inside a character class, PCRE always treated \R and \X as literals,
283        whereas Perl faults them if its -w option is set. I have changed PCRE so
284        that it faults them when PCRE_EXTRA is set.
286    5.  Added support for \N, which always matches any character other than
287        newline. (It is the same as "." when PCRE_DOTALL is not set.)
289    6.  When compiling pcregrep with newer versions of gcc which may have
290        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
291        declared with attribute warn_unused_result" were given. Just casting the
292        result to (void) does not stop the warnings; a more elaborate fudge is
293        needed. I've used a macro to implement this.
295    7.  Minor change to pcretest.c to avoid a compiler warning.
297    8.  Added four artifical Unicode properties to help with an option to make
298        \s etc use properties (see next item). The new properties are: Xan
299        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
301    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
302        use Unicode properties. (*UCP) at the start of a pattern can be used to set
303        this option. Modified pcretest to add /W to test this facility. Added
304        REG_UCP to make it available via the POSIX interface.
306    10. Added --line-buffered to pcregrep.
308    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
309        studied, and the match started with a letter with a code point greater than
310        127 whose first byte was different to the first byte of the other case of
311        the letter, the other case of this starting letter was not recognized
312        (#976).
314    12. If a pattern that was studied started with a repeated Unicode property
315        test, for example, \p{Nd}+, there was the theoretical possibility of
316        setting up an incorrect bitmap of starting bytes, but fortunately it could
317        not have actually happened in practice until change 8 above was made (it
318        added property types that matched character-matching opcodes).
320    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
321        possible starting bytes for non-anchored patterns.
323    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
324        \R, and also a number of cases that involve Unicode properties, both
325        explicit and implicit when PCRE_UCP is set.
327    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
328        input, it could crash or give wrong results if characters with values
329        greater than 0xc0 were present in the subject string. (Detail: it assumed
330        UTF-8 input when processing these items.)
332    16. Added a lot of (int) casts to avoid compiler warnings in systems where
333        size_t is 64-bit (#991).
335    17. Added a check for running out of memory when PCRE is compiled with
336        --disable-stack-for-recursion (#990).
338    18. If the last data line in a file for pcretest does not have a newline on
339        the end, a newline was missing in the output.
341    19. The default pcre_chartables.c file recognizes only ASCII characters (values
342        less than 128) in its various bitmaps. However, there is a facility for
343        generating tables according to the current locale when PCRE is compiled. It
344        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
345        characters, are recognized by isspace() and therefore were getting set in
346        these tables, and indeed these tables seem to approximate to ISO 8859. This
347        caused a problem in UTF-8 mode when pcre_study() was used to create a list
348        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
349        which of course cannot start UTF-8 characters. I have changed the code so
350        that only real ASCII characters (less than 128) and the correct starting
351        bytes for UTF-8 encodings are set for characters greater than 127 when in
352        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
353        altogether.)
355    20. Added the /T option to pcretest so as to be able to run tests with non-
356        standard character tables, thus making it possible to include the tests
357        used for 19 above in the standard set of tests.
359    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
360        reference to a subpattern the other side of a comment that contains an
361        opening parenthesis caused either an internal compiling error, or a
362        reference to the wrong subpattern.
365    Version 8.02 19-Mar-2010
366    ------------------------
368    1.  The Unicode data tables have been updated to Unicode 5.2.0.
370    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
371        configured.
373    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
374        original author of that file, following a query about its status.
376    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
377        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
379    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
380        quantifier applied to a forward-referencing subroutine call, could compile
381        incorrect code or give the error "internal error: previously-checked
382        referenced subpattern not found".
384    6.  Both MS Visual Studio and Symbian OS have problems with initializing
385        variables to point to external functions. For these systems, therefore,
386        pcre_malloc etc. are now initialized to local functions that call the
387        relevant global functions.
389    7.  There were two entries missing in the vectors called coptable and poptable
390        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
391        I've fixed the data, and added a kludgy way of testing at compile time that
392        the lengths are correct (equal to the number of opcodes).
394    8.  Following on from 7, I added a similar kludge to check the length of the
395        eint vector in pcreposix.c.
397    9.  Error texts for pcre_compile() are held as one long string to avoid too
398        much relocation at load time. To find a text, the string is searched,
399        counting zeros. There was no check for running off the end of the string,
400        which could happen if a new error number was added without updating the
401        string.
403    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
405    11. \K was not working if it appeared in an atomic group or in a group that
406        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
407        \K is "not well defined" if used in an assertion. PCRE now accepts it if
408        the assertion is positive, but not if it is negative.
410    12. Change 11 fortuitously reduced the size of the stack frame used in the
411        "match()" function of pcre_exec.c by one pointer. Forthcoming
412        implementation of support for (*MARK) will need an extra pointer on the
413        stack; I have reserved it now, so that the stack frame size does not
414        decrease.
416    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
417        item in branch that calls a recursion is a subroutine call - as in the
418        second branch in the above example - was incorrectly given the compile-
419        time error "recursive call could loop indefinitely" because pcre_compile()
420        was not correctly checking the subroutine for matching a non-empty string.
422    14. The checks for overrunning compiling workspace could trigger after an
423        overrun had occurred. This is a "should never occur" error, but it can be
424        triggered by pathological patterns such as hundreds of nested parentheses.
425        The checks now trigger 100 bytes before the end of the workspace.
427    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
430    Version 8.01 19-Jan-2010
431    ------------------------
433    1.  If a pattern contained a conditional subpattern with only one branch (in
434        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
435        computed the wrong minimum data length (which is of course zero for such
436        subpatterns). This could cause incorrect "no match" results.
438    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
439        the pattern is reset in the first branch, pcre_compile() failed with
440        "internal error: code overflow at offset...". This happened only when
441        the reset was to the original external option setting. (An optimization
442        abstracts leading options settings into an external setting, which was the
443        cause of this.)
445    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
446        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
447        assertion pattern did not match (meaning that the assertion was true), it
448        was incorrectly treated as false if the SKIP had been reached during the
449        matching. This also applied to assertions used as conditions.
451    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
452        assertion subpattern, including such a pattern used as a condition,
453        unpredictable results occurred, instead of the error return
456    5.  The C++ GlobalReplace function was not working like Perl for the special
457        situation when an empty string is matched. It now does the fancy magic
458        stuff that is necessary.
460    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
461        removed. (These were left over from very, very early versions of PCRE.)
463    7.  Some cosmetic changes to the code to make life easier when compiling it
464        as part of something else:
466        (a) Change DEBUG to PCRE_DEBUG.
468        (b) In pcre_compile(), rename the member of the "branch_chain" structure
469            called "current" as "current_branch", to prevent a collision with the
470            Linux macro when compiled as a kernel module.
472        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
473            prevent a collision with the Linux macro when compiled as a kernel
474            module.
476    8.  In pcre_compile() there are some checks for integer overflows that used to
477        cast potentially large values to (double). This has been changed to that
478        when building, a check for int64_t is made, and if it is found, it is used
479        instead, thus avoiding the use of floating point arithmetic. (There is no
480        other use of FP in PCRE.) If int64_t is not found, the fallback is to
481        double.
483    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
484        2005 (difference between two addresses compared to an unsigned value).
486    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
487        custom one, because of the following reported problem in Windows:
489          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
490              under Win32.
491          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
492              therefore missing the function definition.
493          - The compiler thus generates a "C" signature for the test function.
494          - The linker fails to find the "C" function.
495          - PCRE fails to configure if asked to do so against libbz2.
497    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
498        messages were output:
500          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
501          rerunning libtoolize, to keep the correct libtool macros in-tree.
502          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
504        I have done both of these things.
506    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
507        most of the time, it *can* run out if it is given a pattern that contains a
508        runaway infinite recursion. I updated the discussion in the pcrestack man
509        page.
511    13. Now that we have gone to the x.xx style of version numbers, the minor
512        version may start with zero. Using 08 or 09 is a bad idea because users
513        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
514        interpreted as invalid octal numbers. I've updated the previous comment in
515        configure.ac, and also added a check that gives an error if 08 or 09 are
516        used.
518    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
519        causing partial matching to fail when the end of the subject matched \W
520        in a UTF-8 pattern where \W was quantified with a minimum of 3.
522    15. There were some discrepancies between the declarations in pcre_internal.h
523        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
524        their definitions. The declarations used "const uschar *" and the
525        definitions used USPTR. Even though USPTR is normally defined as "const
526        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
527        reported that: "This difference in casting confuses some C++ compilers, for
528        example, SunCC recognizes above declarations as different functions and
529        generates broken code for hbpcre." I have changed the declarations to use
530        USPTR.
532    16. GNU libtool is named differently on some systems. The autogen.sh script now
533        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
534        (FreeBSD).
536    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
537        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
538        comment: "Figure out how to create a longlong from a string: strtoll and
539        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
540        instance, but it only takes 2 args instead of 3!"
542    18. A subtle bug concerned with back references has been fixed by a change of
543        specification, with a corresponding code fix. A pattern such as
544        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
545        refers, was giving matches when it shouldn't. For example, xa=xaaa would
546        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
547        same bug. Such groups have to be quantified to be useful, or contained
548        inside another quantified group. (If there's no repetition, the reference
549        can never match.) The problem arises because, having left the group and
550        moved on to the rest of the pattern, a later failure that backtracks into
551        the group uses the captured value from the final iteration of the group
552        rather than the correct earlier one. I have fixed this in PCRE by forcing
553        any group that contains a reference to itself to be an atomic group; that
554        is, there cannot be any backtracking into it once it has completed. This is
555        similar to recursive and subroutine calls.
558    Version 8.00 19-Oct-09
559  ----------------------  ----------------------
561  1.  The table for translating pcre_compile() error codes into POSIX error codes  1.  The table for translating pcre_compile() error codes into POSIX error codes
562      was out-of-date, and there was no check on the pcre_compile() error code      was out-of-date, and there was no check on the pcre_compile() error code
563      being within the table. This could lead to an OK return being given in      being within the table. This could lead to an OK return being given in
564      error.      error.
566    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
567        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
568        in a Windows environment.
570    3.  The pcregrep --count option prints the count for each file even when it is
571        zero, as does GNU grep. However, pcregrep was also printing all files when
572        --files-with-matches was added. Now, when both options are given, it prints
573        counts only for those files that have at least one match. (GNU grep just
574        prints the file name in this circumstance, but including the count seems
575        more useful - otherwise, why use --count?) Also ensured that the
576        combination -clh just lists non-zero counts, with no names.
578    4.  The long form of the pcregrep -F option was incorrectly implemented as
579        --fixed_strings instead of --fixed-strings. This is an incompatible change,
580        but it seems right to fix it, and I didn't think it was worth preserving
581        the old behaviour.
583    5.  The command line items --regex=pattern and --regexp=pattern were not
584        recognized by pcregrep, which required --regex pattern or --regexp pattern
585        (with a space rather than an '='). The man page documented the '=' forms,
586        which are compatible with GNU grep; these now work.
588    6.  No libpcreposix.pc file was created for pkg-config; there was just
589        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
591    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
592        when UCP support is not needed, by modifying the Python script that
593        generates it from Unicode data files. This should not matter if the module
594        is correctly used as a library, but I received one complaint about 50K of
595        unwanted data. My guess is that the person linked everything into his
596        program rather than using a library. Anyway, it does no harm.
598    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
599        was a minimum greater than 1 for a wide character in a possessive
600        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
601        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
602        character. Chaos in the form of incorrect output or a compiling loop could
603        result.
605    9.  The restrictions on what a pattern can contain when partial matching is
606        requested for pcre_exec() have been removed. All patterns can now be
607        partially matched by this function. In addition, if there are at least two
608        slots in the offset vector, the offset of the earliest inspected character
609        for the match and the offset of the end of the subject are set in them when
610        PCRE_ERROR_PARTIAL is returned.
612    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
613        synonymous with PCRE_PARTIAL, for backwards compatibility, and
614        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
615        and may be more useful for multi-segment matching.
617    11. Partial matching with pcre_exec() is now more intuitive. A partial match
618        used to be given if ever the end of the subject was reached; now it is
619        given only if matching could not proceed because another character was
620        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
621        string "Z", which now yields "no match" instead of "partial match". In the
622        case of pcre_dfa_exec(), "no match" is given if every matching path for the
623        final character ended with (*FAIL).
625    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
626        if the pattern had a "must contain" character that was already found in the
627        earlier partial match, unless partial matching was again requested. For
628        example, with the pattern /dog.(body)?/, the "must contain" character is
629        "g". If the first part-match was for the string "dog", restarting with
630        "sbody" failed. This bug has been fixed.
632    13. The string returned by pcre_dfa_exec() after a partial match has been
633        changed so that it starts at the first inspected character rather than the
634        first character of the match. This makes a difference only if the pattern
635        starts with a lookbehind assertion or \b or \B (\K is not supported by
636        pcre_dfa_exec()). It's an incompatible change, but it makes the two
637        matching functions compatible, and I think it's the right thing to do.
639    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
640        so that the demonstration program is easily available in environments where
641        PCRE has not been installed from source.
643    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
644        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
645        library.
647    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
648        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
649        is not the first non-POSIX option to be added. Clearly some people find
650        these options useful.
652    17. If a caller to the POSIX matching function regexec() passes a non-zero
653        value for nmatch with a NULL value for pmatch, the value of
654        nmatch is forced to zero.
656    18. RunGrepTest did not have a test for the availability of the -u option of
657        the diff command, as RunTest does. It now checks in the same way as
658        RunTest, and also checks for the -b option.
660    19. If an odd number of negated classes containing just a single character
661        interposed, within parentheses, between a forward reference to a named
662        subpattern and the definition of the subpattern, compilation crashed with
663        an internal error, complaining that it could not find the referenced
664        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
665        [The bug was that it was starting one character too far in when skipping
666        over the character class, thus treating the ] as data rather than
667        terminating the class. This meant it could skip too much.]
669    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
670        /g option in pcretest when the pattern contains \K, which makes it possible
671        to have an empty string match not at the start, even when the pattern is
672        anchored. Updated pcretest and pcredemo to use this option.
674    21. If the maximum number of capturing subpatterns in a recursion was greater
675        than the maximum at the outer level, the higher number was returned, but
676        with unset values at the outer level. The correct (outer level) value is
677        now given.
679    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
680        PCRE did not set those parentheses (unlike Perl). I have now found a way to
681        make it do so. The string so far is captured, making this feature
682        compatible with Perl.
684    23. The tests have been re-organized, adding tests 11 and 12, to make it
685        possible to check the Perl 5.10 features against Perl 5.10.
687    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
688        pattern matches a fixed length string. PCRE did not allow this; now it
689        does. Neither allows recursion.
691    25. I finally figured out how to implement a request to provide the minimum
692        length of subject string that was needed in order to match a given pattern.
693        (It was back references and recursion that I had previously got hung up
694        on.) This code has now been added to pcre_study(); it finds a lower bound
695        to the length of subject needed. It is not necessarily the greatest lower
696        bound, but using it to avoid searching strings that are too short does give
697        some useful speed-ups. The value is available to calling programs via
698        pcre_fullinfo().
700    26. While implementing 25, I discovered to my embarrassment that pcretest had
701        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
702        study optimizations had never been tested with that matching function.
703        Oops. What is worse, even when it was passed study data, there was a bug in
704        pcre_dfa_exec() that meant it never actually used it. Double oops. There
705        were also very few tests of studied patterns with pcre_dfa_exec().
707    27. If (?| is used to create subpatterns with duplicate numbers, they are now
708        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
709        on the other side of the coin, they are no longer allowed to have different
710        names, because these cannot be distinguished in PCRE, and this has caused
711        confusion. (This is a difference from Perl.)
713    28. When duplicate subpattern names are present (necessarily with different
714        numbers, as required by 27 above), and a test is made by name in a
715        conditional pattern, either for a subpattern having been matched, or for
716        recursion in such a pattern, all the associated numbered subpatterns are
717        tested, and the overall condition is true if the condition is true for any
718        one of them. This is the way Perl works, and is also more like the way
719        testing by number works.
722  Version 7.9 11-Apr-09  Version 7.9 11-Apr-09
723  ---------------------  ---------------------

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