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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.5 31-Dec-07  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 collections of tests with and without
83        study enabled, and thereby test pcre_study() more easily. All the standard
84        tests are now run with and without -s (but some patterns can be marked as
85        "never study" - see 20 below).
87    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
88        restoration of the capturing data to the outer values was not happening
89        correctly.
91    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
92        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
93        pattern had matched an empty string, and so incorrectly returned a no
94        match.
96    17. There was optimizing code for the last branch of non-capturing parentheses,
97        and also for the obeyed branch of a conditional subexpression, which used
98        tail recursion to cut down on stack usage. Unfortunately, not that there is
99        the possibility of (*THEN) occurring in these branches, tail recursion is
100        no longer possible because the return has to be checked for (*THEN). These
101        two optimizations have therefore been removed.
103    18. If a pattern containing \R was studied, it was assumed that \R always
104        matched two bytes, thus causing the minimum subject length to be
105        incorrectly computed because \R can also match just one byte.
107    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
108        was incorrectly computed.
110    20. If /S is present twice on a test pattern in pcretest input, it *disables*
111        studying, thereby overriding the use of -s on the command line. This is
112        necessary for one or two tests to keep the output identical in both cases.
114    21. When (*ACCEPT) was used in an assertion that matched an empty string and
115        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
117    22. When an atomic group that contained a capturing parenthesis was
118        successfully matched, but the branch in which it appeared failed, the
119        capturing was not being forgotten if a higher numbered group was later
120        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
121        group 1 to "a", when in fact it should be unset. This applied to multi-
122        branched capturing and non-capturing groups, repeated or not, and also to
123        positive assertions (capturing in negative assertions is not well defined
124        in PCRE) and also to nested atomic groups.
126    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
127        subject after a captured substring (to make it easier to tell which of a
128        number of identical substrings has been captured).
130    24. The way atomic groups are processed by pcre_exec() has been changed so that
131        if they are repeated, backtracking one repetition now resets captured
132        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
133        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
134        "aaa". Previously, it would have been "a". As part of this code
135        refactoring, the way recursive calls are handled has also been changed.
137    24. If an assertion condition captured any substrings, they were not passed
138        back unless some other capturing happened later. For example, if
139        (?(?=(a))a) was matched against "a", no capturing was returned.
141    25. When studying a pattern that contained subroutine calls or assertions,
142        the code for finding the minimum length of a possible match was handling
143        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
144        group 1 called group 2 while simultaneously a separate group 2 called group
145        1). A stack overflow occurred in this case. I have fixed this by limiting
146        the recursion depth to 10.
148    26. Updated RunTest.bat in the distribution to the version supplied by Tom
149        Fortmann. This supports explicit test numbers on the command line, and has
150        argument validation and error reporting.
152    27. An instance of \X with an unlimited repeat could fail if at any point the
153        first character it looked at was a mark character.
155    28. Some minor code refactoring concerning Unicode properties and scripts
156        should reduce the stack requirement of match() slightly.
158    29. Added the '=' option to pcretest to check the setting of unused capturing
159        slots at the end of the pattern, which are documented as being -1, but are
160        not included in the return count.
163    Version 8.12 15-Jan-2011
164    ------------------------
166    1.  Fixed some typos in the markup of the man pages, and wrote a script that
167        checks for such things as part of the documentation building process.
169    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
170        --match-limit and --recursion-limit options (added for 8.11). In
171        particular, this made one of the standard tests fail. (The integer value
172        went into the wrong half of a long int.)
174    3.  If the --colour option was given to pcregrep with -v (invert match), it
175        did strange things, either producing crazy output, or crashing. It should,
176        of course, ignore a request for colour when reporting lines that do not
177        match.
179    4.  Another pcregrep bug caused similar problems if --colour was specified with
180        -M (multiline) and the pattern match finished with a line ending.
182    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
183        matched in multiline mode, the following line was shown as part of the
184        match. This seems wrong, so I have changed it.
186    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
187        the check for further matches in the same line (so they could be coloured)
188        to overrun the end of the current line. If another match was found, it was
189        incorrectly shown (and then shown again when found in the next line).
191    7.  If pcregrep was compiled under Windows, there was a reference to the
192        function pcregrep_exit() before it was defined. I am assuming this was
193        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
194        reported by a user. I've moved the definition above the reference.
197    Version 8.11 10-Dec-2010
198    ------------------------
200    1.  (*THEN) was not working properly if there were untried alternatives prior
201        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
202        backtracked to try for "b" instead of moving to the next alternative branch
203        at the same level (in this case, to look for "c"). The Perl documentation
204        is clear that when (*THEN) is backtracked onto, it goes to the "next
205        alternative in the innermost enclosing group".
207    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
208        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
209        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
210        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
211        (*THEN).
213    3.  If \s appeared in a character class, it removed the VT character from
214        the class, even if it had been included by some previous item, for example
215        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
216        of \s, but is part of the POSIX "space" class.)
218    4.  A partial match never returns an empty string (because you can always
219        match an empty string at the end of the subject); however the checking for
220        an empty string was starting at the "start of match" point. This has been
221        changed to the "earliest inspected character" point, because the returned
222        data for a partial match starts at this character. This means that, for
223        example, /(?<=abc)def/ gives a partial match for the subject "abc"
224        (previously it gave "no match").
226    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
227        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
228        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
229        has an implication that the given string is incomplete (because a partial
230        match is preferred over a full match). For this reason, these items now
231        give a partial match in this situation. [Aside: previously, the one case
232        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
233        match rather than a full match, which was wrong by the old rules, but is
234        now correct.]
236    6.  There was a bug in the handling of #-introduced comments, recognized when
237        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
238        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
239        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
240        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
241        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
242        places in pcre_compile().
244    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
245        comments when looking ahead for named forward references to subpatterns,
246        the only newline sequence it recognized was NL. It now handles newlines
247        according to the set newline convention.
249    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
250        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
251        cater for a lack of strerror(). These oversights have been fixed.
253    9.  Added --match-limit and --recursion-limit to pcregrep.
255    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
257    11. When the -o option was used, pcregrep was setting a return code of 1, even
258        when matches were found, and --line-buffered was not being honoured.
260    12. Added an optional parentheses number to the -o and --only-matching options
261        of pcregrep.
263    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
264        can match an empty string. The code to do it in pcretest and pcredemo
265        needed fixing:
267        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
268            only one byte after an empty string match just before CRLF (this case
269            just got forgotten; "any" and "anycrlf" were OK).
271        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
272            mode when an empty string match preceded an ASCII character followed by
273            a non-ASCII character. (The code for advancing by one character rather
274            than one byte was nonsense.)
276        (c) The pcredemo.c sample program did not have any code at all to handle
277            the cases when CRLF is a valid newline sequence.
279    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
280        as a starting offset was within the subject string. There is now a new
281        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
282        negative or greater than the length of the string. In order to test this,
283        pcretest is extended to allow the setting of negative starting offsets.
285    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
286        starting offset points to the beginning of a UTF-8 character was
287        unnecessarily clumsy. I tidied it up.
289    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
290        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
292    17. Nobody had reported that the --include_dir option, which was added in
293        release 7.7 should have been called --include-dir (hyphen, not underscore)
294        for compatibility with GNU grep. I have changed it to --include-dir, but
295        left --include_dir as an undocumented synonym, and the same for
296        --exclude-dir, though that is not available in GNU grep, at least as of
297        release 2.5.4.
299    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
300        characters from a string of bytes) have been redefined so as not to use
301        loops, in order to improve performance in some environments. At the same
302        time, I abstracted some of the common code into auxiliary macros to save
303        repetition (this should not affect the compiled code).
305    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
306        compile-time error is now given if \c is not followed by an ASCII
307        character, that is, a byte less than 128. (In EBCDIC mode, the code is
308        different, and any byte value is allowed.)
310    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
311        START_OPTIMIZE option, which is now allowed at compile time - but just
312        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
313        to pcregrep and other applications that have no direct access to PCRE
314        options. The new /Y option in pcretest sets this option when calling
315        pcre_compile().
317    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
318        back references. Groups containing recursive back references were forced to
319        be atomic by that change, but in the case of named groups, the amount of
320        memory required was incorrectly computed, leading to "Failed: internal
321        error: code overflow". This has been fixed.
323    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
324        pcretest.c, to avoid build problems in some Borland environments.
327    Version 8.10 25-Jun-2010
328    ------------------------
330    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
331        THEN.
333    2.  (*ACCEPT) was not working when inside an atomic group.
335    3.  Inside a character class, \B is treated as a literal by default, but
336        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
337        causes the error). The code is unchanged, but I tidied the documentation.
339    4.  Inside a character class, PCRE always treated \R and \X as literals,
340        whereas Perl faults them if its -w option is set. I have changed PCRE so
341        that it faults them when PCRE_EXTRA is set.
343    5.  Added support for \N, which always matches any character other than
344        newline. (It is the same as "." when PCRE_DOTALL is not set.)
346    6.  When compiling pcregrep with newer versions of gcc which may have
347        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
348        declared with attribute warn_unused_result" were given. Just casting the
349        result to (void) does not stop the warnings; a more elaborate fudge is
350        needed. I've used a macro to implement this.
352    7.  Minor change to pcretest.c to avoid a compiler warning.
354    8.  Added four artifical Unicode properties to help with an option to make
355        \s etc use properties (see next item). The new properties are: Xan
356        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
358    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
359        use Unicode properties. (*UCP) at the start of a pattern can be used to set
360        this option. Modified pcretest to add /W to test this facility. Added
361        REG_UCP to make it available via the POSIX interface.
363    10. Added --line-buffered to pcregrep.
365    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
366        studied, and the match started with a letter with a code point greater than
367        127 whose first byte was different to the first byte of the other case of
368        the letter, the other case of this starting letter was not recognized
369        (#976).
371    12. If a pattern that was studied started with a repeated Unicode property
372        test, for example, \p{Nd}+, there was the theoretical possibility of
373        setting up an incorrect bitmap of starting bytes, but fortunately it could
374        not have actually happened in practice until change 8 above was made (it
375        added property types that matched character-matching opcodes).
377    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
378        possible starting bytes for non-anchored patterns.
380    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
381        \R, and also a number of cases that involve Unicode properties, both
382        explicit and implicit when PCRE_UCP is set.
384    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
385        input, it could crash or give wrong results if characters with values
386        greater than 0xc0 were present in the subject string. (Detail: it assumed
387        UTF-8 input when processing these items.)
389    16. Added a lot of (int) casts to avoid compiler warnings in systems where
390        size_t is 64-bit (#991).
392    17. Added a check for running out of memory when PCRE is compiled with
393        --disable-stack-for-recursion (#990).
395    18. If the last data line in a file for pcretest does not have a newline on
396        the end, a newline was missing in the output.
398    19. The default pcre_chartables.c file recognizes only ASCII characters (values
399        less than 128) in its various bitmaps. However, there is a facility for
400        generating tables according to the current locale when PCRE is compiled. It
401        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
402        characters, are recognized by isspace() and therefore were getting set in
403        these tables, and indeed these tables seem to approximate to ISO 8859. This
404        caused a problem in UTF-8 mode when pcre_study() was used to create a list
405        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
406        which of course cannot start UTF-8 characters. I have changed the code so
407        that only real ASCII characters (less than 128) and the correct starting
408        bytes for UTF-8 encodings are set for characters greater than 127 when in
409        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
410        altogether.)
412    20. Added the /T option to pcretest so as to be able to run tests with non-
413        standard character tables, thus making it possible to include the tests
414        used for 19 above in the standard set of tests.
416    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
417        reference to a subpattern the other side of a comment that contains an
418        opening parenthesis caused either an internal compiling error, or a
419        reference to the wrong subpattern.
422    Version 8.02 19-Mar-2010
423    ------------------------
425    1.  The Unicode data tables have been updated to Unicode 5.2.0.
427    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
428        configured.
430    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
431        original author of that file, following a query about its status.
433    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
434        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
436    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
437        quantifier applied to a forward-referencing subroutine call, could compile
438        incorrect code or give the error "internal error: previously-checked
439        referenced subpattern not found".
441    6.  Both MS Visual Studio and Symbian OS have problems with initializing
442        variables to point to external functions. For these systems, therefore,
443        pcre_malloc etc. are now initialized to local functions that call the
444        relevant global functions.
446    7.  There were two entries missing in the vectors called coptable and poptable
447        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
448        I've fixed the data, and added a kludgy way of testing at compile time that
449        the lengths are correct (equal to the number of opcodes).
451    8.  Following on from 7, I added a similar kludge to check the length of the
452        eint vector in pcreposix.c.
454    9.  Error texts for pcre_compile() are held as one long string to avoid too
455        much relocation at load time. To find a text, the string is searched,
456        counting zeros. There was no check for running off the end of the string,
457        which could happen if a new error number was added without updating the
458        string.
460    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
462    11. \K was not working if it appeared in an atomic group or in a group that
463        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
464        \K is "not well defined" if used in an assertion. PCRE now accepts it if
465        the assertion is positive, but not if it is negative.
467    12. Change 11 fortuitously reduced the size of the stack frame used in the
468        "match()" function of pcre_exec.c by one pointer. Forthcoming
469        implementation of support for (*MARK) will need an extra pointer on the
470        stack; I have reserved it now, so that the stack frame size does not
471        decrease.
473    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
474        item in branch that calls a recursion is a subroutine call - as in the
475        second branch in the above example - was incorrectly given the compile-
476        time error "recursive call could loop indefinitely" because pcre_compile()
477        was not correctly checking the subroutine for matching a non-empty string.
479    14. The checks for overrunning compiling workspace could trigger after an
480        overrun had occurred. This is a "should never occur" error, but it can be
481        triggered by pathological patterns such as hundreds of nested parentheses.
482        The checks now trigger 100 bytes before the end of the workspace.
484    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
487    Version 8.01 19-Jan-2010
488    ------------------------
490    1.  If a pattern contained a conditional subpattern with only one branch (in
491        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
492        computed the wrong minimum data length (which is of course zero for such
493        subpatterns). This could cause incorrect "no match" results.
495    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
496        the pattern is reset in the first branch, pcre_compile() failed with
497        "internal error: code overflow at offset...". This happened only when
498        the reset was to the original external option setting. (An optimization
499        abstracts leading options settings into an external setting, which was the
500        cause of this.)
502    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
503        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
504        assertion pattern did not match (meaning that the assertion was true), it
505        was incorrectly treated as false if the SKIP had been reached during the
506        matching. This also applied to assertions used as conditions.
508    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
509        assertion subpattern, including such a pattern used as a condition,
510        unpredictable results occurred, instead of the error return
513    5.  The C++ GlobalReplace function was not working like Perl for the special
514        situation when an empty string is matched. It now does the fancy magic
515        stuff that is necessary.
517    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
518        removed. (These were left over from very, very early versions of PCRE.)
520    7.  Some cosmetic changes to the code to make life easier when compiling it
521        as part of something else:
523        (a) Change DEBUG to PCRE_DEBUG.
525        (b) In pcre_compile(), rename the member of the "branch_chain" structure
526            called "current" as "current_branch", to prevent a collision with the
527            Linux macro when compiled as a kernel module.
529        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
530            prevent a collision with the Linux macro when compiled as a kernel
531            module.
533    8.  In pcre_compile() there are some checks for integer overflows that used to
534        cast potentially large values to (double). This has been changed to that
535        when building, a check for int64_t is made, and if it is found, it is used
536        instead, thus avoiding the use of floating point arithmetic. (There is no
537        other use of FP in PCRE.) If int64_t is not found, the fallback is to
538        double.
540    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
541        2005 (difference between two addresses compared to an unsigned value).
543    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
544        custom one, because of the following reported problem in Windows:
546          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
547              under Win32.
548          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
549              therefore missing the function definition.
550          - The compiler thus generates a "C" signature for the test function.
551          - The linker fails to find the "C" function.
552          - PCRE fails to configure if asked to do so against libbz2.
554    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
555        messages were output:
557          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
558          rerunning libtoolize, to keep the correct libtool macros in-tree.
559          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
561        I have done both of these things.
563    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
564        most of the time, it *can* run out if it is given a pattern that contains a
565        runaway infinite recursion. I updated the discussion in the pcrestack man
566        page.
568    13. Now that we have gone to the x.xx style of version numbers, the minor
569        version may start with zero. Using 08 or 09 is a bad idea because users
570        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
571        interpreted as invalid octal numbers. I've updated the previous comment in
572        configure.ac, and also added a check that gives an error if 08 or 09 are
573        used.
575    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
576        causing partial matching to fail when the end of the subject matched \W
577        in a UTF-8 pattern where \W was quantified with a minimum of 3.
579    15. There were some discrepancies between the declarations in pcre_internal.h
580        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
581        their definitions. The declarations used "const uschar *" and the
582        definitions used USPTR. Even though USPTR is normally defined as "const
583        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
584        reported that: "This difference in casting confuses some C++ compilers, for
585        example, SunCC recognizes above declarations as different functions and
586        generates broken code for hbpcre." I have changed the declarations to use
587        USPTR.
589    16. GNU libtool is named differently on some systems. The autogen.sh script now
590        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
591        (FreeBSD).
593    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
594        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
595        comment: "Figure out how to create a longlong from a string: strtoll and
596        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
597        instance, but it only takes 2 args instead of 3!"
599    18. A subtle bug concerned with back references has been fixed by a change of
600        specification, with a corresponding code fix. A pattern such as
601        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
602        refers, was giving matches when it shouldn't. For example, xa=xaaa would
603        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
604        same bug. Such groups have to be quantified to be useful, or contained
605        inside another quantified group. (If there's no repetition, the reference
606        can never match.) The problem arises because, having left the group and
607        moved on to the rest of the pattern, a later failure that backtracks into
608        the group uses the captured value from the final iteration of the group
609        rather than the correct earlier one. I have fixed this in PCRE by forcing
610        any group that contains a reference to itself to be an atomic group; that
611        is, there cannot be any backtracking into it once it has completed. This is
612        similar to recursive and subroutine calls.
615    Version 8.00 19-Oct-09
616    ----------------------
618    1.  The table for translating pcre_compile() error codes into POSIX error codes
619        was out-of-date, and there was no check on the pcre_compile() error code
620        being within the table. This could lead to an OK return being given in
621        error.
623    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
624        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
625        in a Windows environment.
627    3.  The pcregrep --count option prints the count for each file even when it is
628        zero, as does GNU grep. However, pcregrep was also printing all files when
629        --files-with-matches was added. Now, when both options are given, it prints
630        counts only for those files that have at least one match. (GNU grep just
631        prints the file name in this circumstance, but including the count seems
632        more useful - otherwise, why use --count?) Also ensured that the
633        combination -clh just lists non-zero counts, with no names.
635    4.  The long form of the pcregrep -F option was incorrectly implemented as
636        --fixed_strings instead of --fixed-strings. This is an incompatible change,
637        but it seems right to fix it, and I didn't think it was worth preserving
638        the old behaviour.
640    5.  The command line items --regex=pattern and --regexp=pattern were not
641        recognized by pcregrep, which required --regex pattern or --regexp pattern
642        (with a space rather than an '='). The man page documented the '=' forms,
643        which are compatible with GNU grep; these now work.
645    6.  No libpcreposix.pc file was created for pkg-config; there was just
646        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
648    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
649        when UCP support is not needed, by modifying the Python script that
650        generates it from Unicode data files. This should not matter if the module
651        is correctly used as a library, but I received one complaint about 50K of
652        unwanted data. My guess is that the person linked everything into his
653        program rather than using a library. Anyway, it does no harm.
655    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
656        was a minimum greater than 1 for a wide character in a possessive
657        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
658        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
659        character. Chaos in the form of incorrect output or a compiling loop could
660        result.
662    9.  The restrictions on what a pattern can contain when partial matching is
663        requested for pcre_exec() have been removed. All patterns can now be
664        partially matched by this function. In addition, if there are at least two
665        slots in the offset vector, the offset of the earliest inspected character
666        for the match and the offset of the end of the subject are set in them when
667        PCRE_ERROR_PARTIAL is returned.
669    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
670        synonymous with PCRE_PARTIAL, for backwards compatibility, and
671        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
672        and may be more useful for multi-segment matching.
674    11. Partial matching with pcre_exec() is now more intuitive. A partial match
675        used to be given if ever the end of the subject was reached; now it is
676        given only if matching could not proceed because another character was
677        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
678        string "Z", which now yields "no match" instead of "partial match". In the
679        case of pcre_dfa_exec(), "no match" is given if every matching path for the
680        final character ended with (*FAIL).
682    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
683        if the pattern had a "must contain" character that was already found in the
684        earlier partial match, unless partial matching was again requested. For
685        example, with the pattern /dog.(body)?/, the "must contain" character is
686        "g". If the first part-match was for the string "dog", restarting with
687        "sbody" failed. This bug has been fixed.
689    13. The string returned by pcre_dfa_exec() after a partial match has been
690        changed so that it starts at the first inspected character rather than the
691        first character of the match. This makes a difference only if the pattern
692        starts with a lookbehind assertion or \b or \B (\K is not supported by
693        pcre_dfa_exec()). It's an incompatible change, but it makes the two
694        matching functions compatible, and I think it's the right thing to do.
696    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
697        so that the demonstration program is easily available in environments where
698        PCRE has not been installed from source.
700    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
701        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
702        library.
704    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
705        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
706        is not the first non-POSIX option to be added. Clearly some people find
707        these options useful.
709    17. If a caller to the POSIX matching function regexec() passes a non-zero
710        value for nmatch with a NULL value for pmatch, the value of
711        nmatch is forced to zero.
713    18. RunGrepTest did not have a test for the availability of the -u option of
714        the diff command, as RunTest does. It now checks in the same way as
715        RunTest, and also checks for the -b option.
717    19. If an odd number of negated classes containing just a single character
718        interposed, within parentheses, between a forward reference to a named
719        subpattern and the definition of the subpattern, compilation crashed with
720        an internal error, complaining that it could not find the referenced
721        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
722        [The bug was that it was starting one character too far in when skipping
723        over the character class, thus treating the ] as data rather than
724        terminating the class. This meant it could skip too much.]
726    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
727        /g option in pcretest when the pattern contains \K, which makes it possible
728        to have an empty string match not at the start, even when the pattern is
729        anchored. Updated pcretest and pcredemo to use this option.
731    21. If the maximum number of capturing subpatterns in a recursion was greater
732        than the maximum at the outer level, the higher number was returned, but
733        with unset values at the outer level. The correct (outer level) value is
734        now given.
736    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
737        PCRE did not set those parentheses (unlike Perl). I have now found a way to
738        make it do so. The string so far is captured, making this feature
739        compatible with Perl.
741    23. The tests have been re-organized, adding tests 11 and 12, to make it
742        possible to check the Perl 5.10 features against Perl 5.10.
744    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
745        pattern matches a fixed length string. PCRE did not allow this; now it
746        does. Neither allows recursion.
748    25. I finally figured out how to implement a request to provide the minimum
749        length of subject string that was needed in order to match a given pattern.
750        (It was back references and recursion that I had previously got hung up
751        on.) This code has now been added to pcre_study(); it finds a lower bound
752        to the length of subject needed. It is not necessarily the greatest lower
753        bound, but using it to avoid searching strings that are too short does give
754        some useful speed-ups. The value is available to calling programs via
755        pcre_fullinfo().
757    26. While implementing 25, I discovered to my embarrassment that pcretest had
758        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
759        study optimizations had never been tested with that matching function.
760        Oops. What is worse, even when it was passed study data, there was a bug in
761        pcre_dfa_exec() that meant it never actually used it. Double oops. There
762        were also very few tests of studied patterns with pcre_dfa_exec().
764    27. If (?| is used to create subpatterns with duplicate numbers, they are now
765        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
766        on the other side of the coin, they are no longer allowed to have different
767        names, because these cannot be distinguished in PCRE, and this has caused
768        confusion. (This is a difference from Perl.)
770    28. When duplicate subpattern names are present (necessarily with different
771        numbers, as required by 27 above), and a test is made by name in a
772        conditional pattern, either for a subpattern having been matched, or for
773        recursion in such a pattern, all the associated numbered subpatterns are
774        tested, and the overall condition is true if the condition is true for any
775        one of them. This is the way Perl works, and is also more like the way
776        testing by number works.
779    Version 7.9 11-Apr-09
780    ---------------------
782    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
783        (pcretest), all targets were linked against these libraries. This included
784        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
785        libraries. This caused unwanted dependencies to be created. This problem
786        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
787        pcretest is linked with readline.
789    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
790        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
791        moved outside it again, because FALSE and TRUE are already defined in AIX,
792        but BOOL is not.
794    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
795        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
797    4.  The pcregrep documentation said spaces were inserted as well as colons (or
798        hyphens) following file names and line numbers when outputting matching
799        lines. This is not true; no spaces are inserted. I have also clarified the
800        wording for the --colour (or --color) option.
802    5.  In pcregrep, when --colour was used with -o, the list of matching strings
803        was not coloured; this is different to GNU grep, so I have changed it to be
804        the same.
806    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
807        each matching line was coloured. Now it goes on to look for further matches
808        of any of the test patterns, which is the same behaviour as GNU grep.
810    7.  A pattern that could match an empty string could cause pcregrep to loop; it
811        doesn't make sense to accept an empty string match in pcregrep, so I have
812        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
813        seems to be how GNU grep behaves.
815    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
816        start or after a newline", because the conditional assertion was not being
817        correctly handled. The rule now is that both the assertion and what follows
818        in the first alternative must satisfy the test.
820    9.  If auto-callout was enabled in a pattern with a conditional group whose
821        condition was an assertion, PCRE could crash during matching, both with
822        pcre_exec() and pcre_dfa_exec().
824    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
825        used for matching.
827    11. Unicode property support in character classes was not working for
828        characters (bytes) greater than 127 when not in UTF-8 mode.
830    12. Added the -M command line option to pcretest.
832    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
834    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
836    16. Added comments and documentation about mis-use of no_arg in the C++
837        wrapper.
839    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
840        from Martin Jerabek that uses macro names for all relevant character and
841        string constants.
843    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
844        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
845        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
846        these, but not everybody uses configure.
848    19. A conditional group that had only one branch was not being correctly
849        recognized as an item that could match an empty string. This meant that an
850        enclosing group might also not be so recognized, causing infinite looping
851        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
852        with the subject "ab", where knowledge that the repeated group can match
853        nothing is needed in order to break the loop.
855    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
856        exec(), but without supplying a callout function, matching went wrong.
858    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
859        leak if the size of the offset vector was greater than 30. When the vector
860        is smaller, the saved offsets during recursion go onto a local stack
861        vector, but for larger vectors malloc() is used. It was failing to free
862        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
863        error, in fact).
865    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
866        heapframe that is used only when UTF-8 support is enabled. This caused no
867        problem, but was untidy.
869    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
870        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
871        included within another project.
873    24. Steven Van Ingelgem's patches to add more options to the CMake support,
874        slightly modified by me:
876          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
877              not building pcregrep.
879          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
880              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
882    25. Forward references, both numeric and by name, in patterns that made use of
883        duplicate group numbers, could behave incorrectly or give incorrect errors,
884        because when scanning forward to find the reference group, PCRE was not
885        taking into account the duplicate group numbers. A pattern such as
886        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
888    26. Changed a few more instances of "const unsigned char *" to USPTR, making
889        the feature of a custom pointer more persuasive (as requested by a user).
891    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
892        pcretest.c, inside #ifndefs, because it seems they are sometimes already
893        pre-defined.
895    28. Added support for (*UTF8) at the start of a pattern.
897    29. Arrange for flags added by the "release type" setting in CMake to be shown
898        in the configuration summary.
901    Version 7.8 05-Sep-08
902    ---------------------
904    1.  Replaced UCP searching code with optimized version as implemented for Ad
905        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
906        stage table and inline lookup instead of a function, giving speed ups of 2
907        to 5 times on some simple patterns that I tested. Permission was given to
908        distribute the MultiStage2.py script that generates the tables (it's not in
909        the tarball, but is in the Subversion repository).
911    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
912        scripts.
914    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
915        a group with a zero qualifier. The result of the study could be incorrect,
916        or the function might crash, depending on the pattern.
918    4.  Caseless matching was not working for non-ASCII characters in back
919        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
920        It now works when Unicode Property Support is available.
922    5.  In pcretest, an escape such as \x{de} in the data was always generating
923        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
924        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
925        truncation.
927    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
929    7.  Added two (int) casts to pcregrep when printing the difference of two
930        pointers, in case they are 64-bit values.
932    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
933        test 2 if it fails.
935    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
936        and a #define of that name to empty if it is not externally set. This is to
937        allow users of MSVC to set it if necessary.
939    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
940        the convenience functions in the pcre_get.c source file.
942    11. An option change at the start of a pattern that had top-level alternatives
943        could cause overwriting and/or a crash. This command provoked a crash in
944        some environments:
946          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
948        This potential security problem was recorded as CVE-2008-2371.
950    12. For a pattern where the match had to start at the beginning or immediately
951        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
952        pcre_dfa_exec() could read past the end of the passed subject if there was
953        no match. To help with detecting such bugs (e.g. with valgrind), I modified
954        pcretest so that it places the subject at the end of its malloc-ed buffer.
956    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
957        exec() might read past the end of the data buffer in UTF-8 mode.
959    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
960        the data contained the byte 0x85 as part of a UTF-8 character within its
961        first line. This applied both to normal and DFA matching.
963    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
964        /^[^d]*?$/8 failed to match "abc".
966    16. Added a missing copyright notice to pcrecpp_internal.h.
968    17. Make it more clear in the documentation that values returned from
969        pcre_exec() in ovector are byte offsets, not character counts.
971    18. Tidied a few places to stop certain compilers from issuing warnings.
973    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
974        supplied by Stefan Weber. I made a further small update for 7.8 because
975        there is a change of source arrangements: the pcre_searchfuncs.c module is
976        replaced by pcre_ucd.c.
979    Version 7.7 07-May-08
980    ---------------------
982    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
983        a string to a long long, pretend we don't even have a long long." This is
984        done by checking for the strtoq, strtoll, and _strtoi64 functions.
986    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
987        pre-7.6 versions, which defined a global no_arg variable instead of putting
988        it in the RE class. (See also #8 below.)
990    3.  Remove a line of dead code, identified by coverity and reported by Nuno
991        Lopes.
993    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
995        (1) The include/exclude patterns were being applied to the whole pathnames
996            of files, instead of just to the final components.
998        (2) If there was more than one level of directory, the subdirectories were
999            skipped unless they satisfied the include/exclude conditions. This is
1000            inconsistent with GNU grep (and could even be seen as contrary to the
1001            pcregrep specification - which I improved to make it absolutely clear).
1002            The action now is always to scan all levels of directory, and just
1003            apply the include/exclude patterns to regular files.
1005    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
1006        --exclude_dir in the tests to avoid scanning .svn directories.
1008    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
1009        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
1010        doesn't support NULs in patterns.
1012    7.  Added some missing "const"s to declarations of static tables in
1013        pcre_compile.c and pcre_dfa_exec.c.
1015    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
1016        caused by fix #2  above. (Subsequently also a second patch to fix the
1017        first patch. And a third patch - this was a messy problem.)
1019    9.  Applied Craig's patch to remove the use of push_back().
1021    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
1022        matching function regexec().
1024    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
1025        which, however, unlike Perl's \g{...}, are subroutine calls, not back
1026        references. PCRE supports relative numbers with this syntax (I don't think
1027        Oniguruma does).
1029    12. Previously, a group with a zero repeat such as (...){0} was completely
1030        omitted from the compiled regex. However, this means that if the group
1031        was called as a subroutine from elsewhere in the pattern, things went wrong
1032        (an internal error was given). Such groups are now left in the compiled
1033        pattern, with a new opcode that causes them to be skipped at execution
1034        time.
1036    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
1037        to the way PCRE behaves:
1039        (a) A lone ] character is dis-allowed (Perl treats it as data).
1041        (b) A back reference to an unmatched subpattern matches an empty string
1042            (Perl fails the current match path).
1044        (c) A data ] in a character class must be notated as \] because if the
1045            first data character in a class is ], it defines an empty class. (In
1046            Perl it is not possible to have an empty class.) The empty class []
1047            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
1048            The negative empty class [^] matches any one character, independently
1049            of the DOTALL setting.
1051    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
1052        non-existent subpattern following a character class starting with ']' and
1053        containing () gave an internal compiling error instead of "reference to
1054        non-existent subpattern". Fortunately, when the pattern did exist, the
1055        compiled code was correct. (When scanning forwards to check for the
1056        existencd of the subpattern, it was treating the data ']' as terminating
1057        the class, so got the count wrong. When actually compiling, the reference
1058        was subsequently set up correctly.)
1060    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
1061        it was being rejected as not supported by pcre_dfa_exec(), even though
1062        other assertions are supported. I have made pcre_dfa_exec() support
1063        (*FAIL).
1065    16. The implementation of 13c above involved the invention of a new opcode,
1066        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
1067        cannot be changed at match time, I realized I could make a small
1068        improvement to matching performance by compiling OP_ALLANY instead of
1069        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
1070        on the OP_ANY path.
1072    17. Compiling pcretest on Windows with readline support failed without the
1073        following two fixes: (1) Make the unistd.h include conditional on
1074        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
1076    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
1077        ncurses library to be included for pcretest when ReadLine support is
1078        requested, but also to allow for it to be overridden. This patch came from
1079        Daniel Bergström.
1081    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
1082        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
1083        any errors with the current Unicode tables. Thanks to Peter Kankowski for
1084        spotting this.
1087    Version 7.6 28-Jan-08
1088    ---------------------
1090    1.  A character class containing a very large number of characters with
1091        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
1092        overflow.
1094    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
1095        HAVE_LONG_LONG is not defined.
1097    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
1098        bring them up to date and include new features. This patch includes:
1100        - Fixed PH's badly added libz and libbz2 support.
1101        - Fixed a problem with static linking.
1102        - Added pcredemo. [But later removed - see 7 below.]
1103        - Fixed dftables problem and added an option.
1104        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
1105            HAVE_LONG_LONG.
1106        - Added readline support for pcretest.
1107        - Added an listing of the option settings after cmake has run.
1109    4.  A user submitted a patch to Makefile that makes it easy to create
1110        "pcre.dll" under mingw when using Configure/Make. I added stuff to
1111        Makefile.am that cause it to include this special target, without
1112        affecting anything else. Note that the same mingw target plus all
1113        the other distribution libraries and programs are now supported
1114        when configuring with CMake (see 6 below) instead of with
1115        Configure/Make.
1117    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
1118        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
1119        exported in the Windows port". It has not yet been confirmed that the patch
1120        solves the problem, but it does no harm.
1122    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
1123        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
1124        with CMake, and also correct the comment about stack recursion.
1126    7.  Remove the automatic building of pcredemo from the ./configure system and
1127        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
1128        of a program that users should build themselves after PCRE is installed, so
1129        building it automatically is not really right. What is more, it gave
1130        trouble in some build environments.
1132    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
1135    Version 7.5 10-Jan-08
1136  ---------------------  ---------------------
1138  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
# Line 99  Version 7.5 31-Dec-07 Line 1230  Version 7.5 31-Dec-07
1231  20. In pcrecpp.cc, the variable 'count' was incremented twice in  20. In pcrecpp.cc, the variable 'count' was incremented twice in
1232      RE::GlobalReplace(). As a result, the number of replacements returned was      RE::GlobalReplace(). As a result, the number of replacements returned was
1233      double what it should be. I have removed one of the increments.      double what it should be. I removed one of the increments, but Craig sent a
1234        later patch that removed the other one (the right fix) and added unit tests
1235        that check the return values (which was not done before).
1237  21. Several CMake things:  21. Several CMake things:
# Line 110  Version 7.5 31-Dec-07 Line 1243  Version 7.5 31-Dec-07
1243          linked with the newly-built libraries, not previously installed ones.          linked with the newly-built libraries, not previously installed ones.
1247  22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*  22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
1248      crashed when matching a string such as a\x{2029}b (note that \x{2029} is a      crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
1249      UTF-8 newline character). The key issue is that the pattern starts .*;      UTF-8 newline character). The key issue is that the pattern starts .*;
1250      this means that the match must be either at the beginning, or after a      this means that the match must be either at the beginning, or after a
1251      newline. The bug was in the code for advancing after a failed match and      newline. The bug was in the code for advancing after a failed match and
1252      checking that the new position followed a newline. It was not taking      checking that the new position followed a newline. It was not taking
1253      account of UTF-8 characters correctly.      account of UTF-8 characters correctly.
1255  23. PCRE was behaving differently from Perl in the way it recognized POSIX  23. PCRE was behaving differently from Perl in the way it recognized POSIX
1256      character classes. PCRE was not treating the sequence [:...:] as a      character classes. PCRE was not treating the sequence [:...:] as a
1257      character class unless the ... were all letters. Perl, however, seems to      character class unless the ... were all letters. Perl, however, seems to
1258      allow any characters between [: and :], though of course it rejects as      allow any characters between [: and :], though of course it rejects as
1259      unknown any "names" that contain non-letters, because all the known class      unknown any "names" that contain non-letters, because all the known class
1260      names consist only of letters. Thus, Perl gives an error for [[:1234:]],      names consist only of letters. Thus, Perl gives an error for [[:1234:]],
1261      for example, whereas PCRE did not - it did not recognize a POSIX character      for example, whereas PCRE did not - it did not recognize a POSIX character
1262      class. This seemed a bit dangerous, so the code has been changed to be      class. This seemed a bit dangerous, so the code has been changed to be
1263      closer to Perl. The behaviour is not identical to Perl, because PCRE will      closer to Perl. The behaviour is not identical to Perl, because PCRE will
1264      diagnose an unknown class for, for example, [[:l\ower:]] where Perl will      diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
1265      treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where      treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
1266      Perl does, and where it didn't before.      Perl does, and where it didn't before.
1268    24. Rewrite so as to remove the single use of %n from pcregrep because in some
1269        Windows environments %n is disabled by default.
1272  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07

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