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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 7.4 10-Sep-07  Version 8.20 12-Sep-2011
5    ------------------------
7    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
8        a POSIX class. After further experiments with Perl, which convinced me that
9        Perl has bugs and confusions, a closing square bracket is no longer allowed
10        in a POSIX name. This bug also affected patterns with classes that started
11        with full stops.
13    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
14        captured substring, but while checking the failing first alternative,
15        substring 1 is temporarily captured. If the output vector supplied to
16        pcre_exec() was not big enough for this capture, the yield of the function
17        was still zero ("insufficient space for captured substrings"). This cannot
18        be totally fixed without adding another stack variable, which seems a lot
19        of expense for a edge case. However, I have improved the situation in cases
20        such as /(a)(b)x|abc/ matched against "abc", where the return code
21        indicates that fewer than the maximum number of slots in the ovector have
22        been set.
24    3.  Related to (2) above: when there are more back references in a pattern than
25        slots in the output vector, pcre_exec() uses temporary memory during
26        matching, and copies in the captures as far as possible afterwards. It was
27        using the entire output vector, but this conflicts with the specification
28        that only 2/3 is used for passing back captured substrings. Now it uses
29        only the first 2/3, for compatibility. This is, of course, another edge
30        case.
32    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
33        main code base, and can be used by building with --enable-jit. When this is
34        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
35        runtime --no-jit option is given.
37    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
38        ovector, the return from the function was zero, implying that there were
39        other matches that did not fit. The correct "exactly full" value is now
40        returned.
42    6.  If a subpattern that was called recursively or as a subroutine contained
43        (*PRUNE) or any other control that caused it to give a non-standard return,
44        invalid errors such as "Error -26 (nested recursion at the same subject
45        position)" or even infinite loops could occur.
47    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
48        computing the minimum length on reaching *ACCEPT, and so ended up with the
49        wrong value of 1 rather than 0. Further investigation indicates that
50        computing a minimum subject length in the presence of *ACCEPT is difficult
51        (think back references, subroutine calls), and so I have changed the code
52        so that no minimum is registered for a pattern that contains *ACCEPT.
54    8.  If (*THEN) was present in the first (true) branch of a conditional group,
55        it was not handled as intended.
57    9.  Replaced RunTest.bat with the much improved version provided by Sheri
58        Pierce.
60    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
61        the first byte in a match must be "a".
64    Version 8.13 16-Aug-2011
65    ------------------------
67    1.  The Unicode data tables have been updated to Unicode 6.0.0.
69    2.  Two minor typos in pcre_internal.h have been fixed.
71    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
72        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
73        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
75    4.  There were a number of related bugs in the code for matching backrefences
76        caselessly in UTF-8 mode when codes for the characters concerned were
77        different numbers of bytes. For example, U+023A and U+2C65 are an upper
78        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
79        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
80        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
81        2-byte code at the end of the subject (it thought there wasn't enough data
82        left).
84    5.  Comprehensive information about what went wrong is now returned by
85        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
86        as the output vector has at least 2 elements. The offset of the start of
87        the failing character and a reason code are placed in the vector.
89    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
90        now returned is for the first byte of the failing character, instead of the
91        last byte inspected. This is an incompatible change, but I hope it is small
92        enough not to be a problem. It makes the returned offset consistent with
93        pcre_exec() and pcre_dfa_exec().
95    7.  pcretest now gives a text phrase as well as the error number when
96        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
97        failure, the offset and reason code are output.
99    8.  When \R was used with a maximizing quantifier it failed to skip backwards
100        over a \r\n pair if the subsequent match failed. Instead, it just skipped
101        back over a single character (\n). This seems wrong (because it treated the
102        two characters as a single entity when going forwards), conflicts with the
103        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
104        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
105        has been changed.
107    9.  Some internal refactoring has changed the processing so that the handling
108        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
109        time (the PCRE_DOTALL option was changed this way some time ago: version
110        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
111        which was always a bit of a fudge. It also means that there is one less
112        argument for the match() function, which reduces its stack requirements
113        slightly. This change also fixes an incompatibility with Perl: the pattern
114        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
116    10. More internal refactoring has drastically reduced the number of recursive
117        calls to match() for possessively repeated groups such as (abc)++ when
118        using pcre_exec().
120    11. While implementing 10, a number of bugs in the handling of groups were
121        discovered and fixed:
123        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
124        (a|)*(?1) gave a compile-time internal error.
125        ((a|)+)+  did not notice that the outer group could match an empty string.
126        (^a|^)+   was not marked as anchored.
127        (.*a|.*)+ was not marked as matching at start or after a newline.
129    12. Yet more internal refactoring has removed another argument from the match()
130        function. Special calls to this function are now indicated by setting a
131        value in a variable in the "match data" data block.
133    13. Be more explicit in pcre_study() instead of relying on "default" for
134        opcodes that mean there is no starting character; this means that when new
135        ones are added and accidentally left out of pcre_study(), testing should
136        pick them up.
138    14. The -s option of pcretest has been documented for ages as being an old
139        synonym of -m (show memory usage). I have changed it to mean "force study
140        for every regex", that is, assume /S for every regex. This is similar to -i
141        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
142        using it. It makes it easier to run collections of tests with and without
143        study enabled, and thereby test pcre_study() more easily. All the standard
144        tests are now run with and without -s (but some patterns can be marked as
145        "never study" - see 20 below).
147    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
148        restoration of the capturing data to the outer values was not happening
149        correctly.
151    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
152        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
153        pattern had matched an empty string, and so incorrectly returned a no
154        match.
156    17. There was optimizing code for the last branch of non-capturing parentheses,
157        and also for the obeyed branch of a conditional subexpression, which used
158        tail recursion to cut down on stack usage. Unfortunately, now that there is
159        the possibility of (*THEN) occurring in these branches, tail recursion is
160        no longer possible because the return has to be checked for (*THEN). These
161        two optimizations have therefore been removed.
163    18. If a pattern containing \R was studied, it was assumed that \R always
164        matched two bytes, thus causing the minimum subject length to be
165        incorrectly computed because \R can also match just one byte.
167    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
168        was incorrectly computed.
170    20. If /S is present twice on a test pattern in pcretest input, it now
171        *disables* studying, thereby overriding the use of -s on the command line
172        (see 14 above). This is necessary for one or two tests to keep the output
173        identical in both cases.
175    21. When (*ACCEPT) was used in an assertion that matched an empty string and
176        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
178    22. When an atomic group that contained a capturing parenthesis was
179        successfully matched, but the branch in which it appeared failed, the
180        capturing was not being forgotten if a higher numbered group was later
181        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
182        group 1 to "a", when in fact it should be unset. This applied to multi-
183        branched capturing and non-capturing groups, repeated or not, and also to
184        positive assertions (capturing in negative assertions does not happen
185        in PCRE) and also to nested atomic groups.
187    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
188        subject after a captured substring, to make it easier to tell which of a
189        number of identical substrings has been captured.
191    24. The way atomic groups are processed by pcre_exec() has been changed so that
192        if they are repeated, backtracking one repetition now resets captured
193        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
194        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
195        "aaa". Previously, it would have been "a". As part of this code
196        refactoring, the way recursive calls are handled has also been changed.
198    25. If an assertion condition captured any substrings, they were not passed
199        back unless some other capturing happened later. For example, if
200        (?(?=(a))a) was matched against "a", no capturing was returned.
202    26. When studying a pattern that contained subroutine calls or assertions,
203        the code for finding the minimum length of a possible match was handling
204        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
205        group 1 called group 2 while simultaneously a separate group 2 called group
206        1). A stack overflow occurred in this case. I have fixed this by limiting
207        the recursion depth to 10.
209    27. Updated RunTest.bat in the distribution to the version supplied by Tom
210        Fortmann. This supports explicit test numbers on the command line, and has
211        argument validation and error reporting.
213    28. An instance of \X with an unlimited repeat could fail if at any point the
214        first character it looked at was a mark character.
216    29. Some minor code refactoring concerning Unicode properties and scripts
217        should reduce the stack requirement of match() slightly.
219    30. Added the '=' option to pcretest to check the setting of unused capturing
220        slots at the end of the pattern, which are documented as being -1, but are
221        not included in the return count.
223    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
224        compiled something random. Now it gives a compile-time error (as does
225        Perl).
227    32. A *MARK encountered during the processing of a positive assertion is now
228        recorded and passed back (compatible with Perl).
230    33. If --only-matching or --colour was set on a pcregrep call whose pattern
231        had alternative anchored branches, the search for a second match in a line
232        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
233        matched the line "0102" twice. The same bug affected patterns that started
234        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
235        twice.
237    34. Previously, PCRE did not allow quantification of assertions. However, Perl
238        does, and because of capturing effects, quantifying parenthesized
239        assertions may at times be useful. Quantifiers are now allowed for
240        parenthesized assertions.
242    35. A minor code tidy in pcre_compile() when checking options for \R usage.
244    36. \g was being checked for fancy things in a character class, when it should
245        just be a literal "g".
247    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
248        appearance of a nested POSIX class supersedes an apparent external class.
249        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
250        unescaped square brackets may also appear as part of class names. For
251        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
252        more like Perl. (But see 8.20/1 above.)
254    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
255        was because it thought it was \N{name}, which is not supported).
257    39. Add minix to OS list not supporting the -S option in pcretest.
259    40. PCRE tries to detect cases of infinite recursion at compile time, but it
260        cannot analyze patterns in sufficient detail to catch mutual recursions
261        such as ((?1))((?2)). There is now a runtime test that gives an error if a
262        subgroup is called recursively as a subpattern for a second time at the
263        same position in the subject string. In previous releases this might have
264        been caught by the recursion limit, or it might have run out of stack.
266    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
267        happen only once. PCRE was, however incorrectly giving a compile time error
268        "recursive call could loop indefinitely" because it cannot analyze the
269        pattern in sufficient detail. The compile time test no longer happens when
270        PCRE is compiling a conditional subpattern, but actual runaway loops are
271        now caught at runtime (see 40 above).
273    42. It seems that Perl allows any characters other than a closing parenthesis
274        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
275        has been changed to be the same.
277    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
278        as not to get warnings when autogen.sh is called. Also changed
279        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
281    44. To help people who use pcregrep to scan files containing exceedingly long
282        lines, the following changes have been made:
284        (a) The default value of the buffer size parameter has been increased from
285            8K to 20K. (The actual buffer used is three times this size.)
287        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
288            PCRE is built.
290        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
291            to be set at run time.
293        (d) Numerical values in pcregrep options can be followed by K or M, for
294            example --buffer-size=50K.
296        (e) If a line being scanned overflows pcregrep's buffer, an error is now
297            given and the return code is set to 2.
299    45. Add a pointer to the latest mark to the callout data block.
301    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
302        partial match of an empty string instead of no match. This was specific to
303        the use of ".".
305    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
306        complete match instead of a partial match. This bug was dependent on both
307        the PCRE_UTF8 and PCRE_DOTALL options being set.
309    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
310        starting byte set, because \b was not being ignored.
313    Version 8.12 15-Jan-2011
314    ------------------------
316    1.  Fixed some typos in the markup of the man pages, and wrote a script that
317        checks for such things as part of the documentation building process.
319    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
320        --match-limit and --recursion-limit options (added for 8.11). In
321        particular, this made one of the standard tests fail. (The integer value
322        went into the wrong half of a long int.)
324    3.  If the --colour option was given to pcregrep with -v (invert match), it
325        did strange things, either producing crazy output, or crashing. It should,
326        of course, ignore a request for colour when reporting lines that do not
327        match.
329    4.  Another pcregrep bug caused similar problems if --colour was specified with
330        -M (multiline) and the pattern match finished with a line ending.
332    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
333        matched in multiline mode, the following line was shown as part of the
334        match. This seems wrong, so I have changed it.
336    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
337        the check for further matches in the same line (so they could be coloured)
338        to overrun the end of the current line. If another match was found, it was
339        incorrectly shown (and then shown again when found in the next line).
341    7.  If pcregrep was compiled under Windows, there was a reference to the
342        function pcregrep_exit() before it was defined. I am assuming this was
343        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
344        reported by a user. I've moved the definition above the reference.
347    Version 8.11 10-Dec-2010
348    ------------------------
350    1.  (*THEN) was not working properly if there were untried alternatives prior
351        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
352        backtracked to try for "b" instead of moving to the next alternative branch
353        at the same level (in this case, to look for "c"). The Perl documentation
354        is clear that when (*THEN) is backtracked onto, it goes to the "next
355        alternative in the innermost enclosing group".
357    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
358        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
359        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
360        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
361        (*THEN).
363    3.  If \s appeared in a character class, it removed the VT character from
364        the class, even if it had been included by some previous item, for example
365        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
366        of \s, but is part of the POSIX "space" class.)
368    4.  A partial match never returns an empty string (because you can always
369        match an empty string at the end of the subject); however the checking for
370        an empty string was starting at the "start of match" point. This has been
371        changed to the "earliest inspected character" point, because the returned
372        data for a partial match starts at this character. This means that, for
373        example, /(?<=abc)def/ gives a partial match for the subject "abc"
374        (previously it gave "no match").
376    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
377        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
378        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
379        has an implication that the given string is incomplete (because a partial
380        match is preferred over a full match). For this reason, these items now
381        give a partial match in this situation. [Aside: previously, the one case
382        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
383        match rather than a full match, which was wrong by the old rules, but is
384        now correct.]
386    6.  There was a bug in the handling of #-introduced comments, recognized when
387        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
388        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
389        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
390        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
391        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
392        places in pcre_compile().
394    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
395        comments when looking ahead for named forward references to subpatterns,
396        the only newline sequence it recognized was NL. It now handles newlines
397        according to the set newline convention.
399    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
400        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
401        cater for a lack of strerror(). These oversights have been fixed.
403    9.  Added --match-limit and --recursion-limit to pcregrep.
405    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
407    11. When the -o option was used, pcregrep was setting a return code of 1, even
408        when matches were found, and --line-buffered was not being honoured.
410    12. Added an optional parentheses number to the -o and --only-matching options
411        of pcregrep.
413    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
414        can match an empty string. The code to do it in pcretest and pcredemo
415        needed fixing:
417        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
418            only one byte after an empty string match just before CRLF (this case
419            just got forgotten; "any" and "anycrlf" were OK).
421        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
422            mode when an empty string match preceded an ASCII character followed by
423            a non-ASCII character. (The code for advancing by one character rather
424            than one byte was nonsense.)
426        (c) The pcredemo.c sample program did not have any code at all to handle
427            the cases when CRLF is a valid newline sequence.
429    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
430        as a starting offset was within the subject string. There is now a new
431        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
432        negative or greater than the length of the string. In order to test this,
433        pcretest is extended to allow the setting of negative starting offsets.
435    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
436        starting offset points to the beginning of a UTF-8 character was
437        unnecessarily clumsy. I tidied it up.
439    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
440        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
442    17. Nobody had reported that the --include_dir option, which was added in
443        release 7.7 should have been called --include-dir (hyphen, not underscore)
444        for compatibility with GNU grep. I have changed it to --include-dir, but
445        left --include_dir as an undocumented synonym, and the same for
446        --exclude-dir, though that is not available in GNU grep, at least as of
447        release 2.5.4.
449    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
450        characters from a string of bytes) have been redefined so as not to use
451        loops, in order to improve performance in some environments. At the same
452        time, I abstracted some of the common code into auxiliary macros to save
453        repetition (this should not affect the compiled code).
455    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
456        compile-time error is now given if \c is not followed by an ASCII
457        character, that is, a byte less than 128. (In EBCDIC mode, the code is
458        different, and any byte value is allowed.)
460    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
461        START_OPTIMIZE option, which is now allowed at compile time - but just
462        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
463        to pcregrep and other applications that have no direct access to PCRE
464        options. The new /Y option in pcretest sets this option when calling
465        pcre_compile().
467    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
468        back references. Groups containing recursive back references were forced to
469        be atomic by that change, but in the case of named groups, the amount of
470        memory required was incorrectly computed, leading to "Failed: internal
471        error: code overflow". This has been fixed.
473    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
474        pcretest.c, to avoid build problems in some Borland environments.
477    Version 8.10 25-Jun-2010
478    ------------------------
480    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
481        THEN.
483    2.  (*ACCEPT) was not working when inside an atomic group.
485    3.  Inside a character class, \B is treated as a literal by default, but
486        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
487        causes the error). The code is unchanged, but I tidied the documentation.
489    4.  Inside a character class, PCRE always treated \R and \X as literals,
490        whereas Perl faults them if its -w option is set. I have changed PCRE so
491        that it faults them when PCRE_EXTRA is set.
493    5.  Added support for \N, which always matches any character other than
494        newline. (It is the same as "." when PCRE_DOTALL is not set.)
496    6.  When compiling pcregrep with newer versions of gcc which may have
497        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
498        declared with attribute warn_unused_result" were given. Just casting the
499        result to (void) does not stop the warnings; a more elaborate fudge is
500        needed. I've used a macro to implement this.
502    7.  Minor change to pcretest.c to avoid a compiler warning.
504    8.  Added four artifical Unicode properties to help with an option to make
505        \s etc use properties (see next item). The new properties are: Xan
506        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
508    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
509        use Unicode properties. (*UCP) at the start of a pattern can be used to set
510        this option. Modified pcretest to add /W to test this facility. Added
511        REG_UCP to make it available via the POSIX interface.
513    10. Added --line-buffered to pcregrep.
515    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
516        studied, and the match started with a letter with a code point greater than
517        127 whose first byte was different to the first byte of the other case of
518        the letter, the other case of this starting letter was not recognized
519        (#976).
521    12. If a pattern that was studied started with a repeated Unicode property
522        test, for example, \p{Nd}+, there was the theoretical possibility of
523        setting up an incorrect bitmap of starting bytes, but fortunately it could
524        not have actually happened in practice until change 8 above was made (it
525        added property types that matched character-matching opcodes).
527    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
528        possible starting bytes for non-anchored patterns.
530    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
531        \R, and also a number of cases that involve Unicode properties, both
532        explicit and implicit when PCRE_UCP is set.
534    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
535        input, it could crash or give wrong results if characters with values
536        greater than 0xc0 were present in the subject string. (Detail: it assumed
537        UTF-8 input when processing these items.)
539    16. Added a lot of (int) casts to avoid compiler warnings in systems where
540        size_t is 64-bit (#991).
542    17. Added a check for running out of memory when PCRE is compiled with
543        --disable-stack-for-recursion (#990).
545    18. If the last data line in a file for pcretest does not have a newline on
546        the end, a newline was missing in the output.
548    19. The default pcre_chartables.c file recognizes only ASCII characters (values
549        less than 128) in its various bitmaps. However, there is a facility for
550        generating tables according to the current locale when PCRE is compiled. It
551        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
552        characters, are recognized by isspace() and therefore were getting set in
553        these tables, and indeed these tables seem to approximate to ISO 8859. This
554        caused a problem in UTF-8 mode when pcre_study() was used to create a list
555        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
556        which of course cannot start UTF-8 characters. I have changed the code so
557        that only real ASCII characters (less than 128) and the correct starting
558        bytes for UTF-8 encodings are set for characters greater than 127 when in
559        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
560        altogether.)
562    20. Added the /T option to pcretest so as to be able to run tests with non-
563        standard character tables, thus making it possible to include the tests
564        used for 19 above in the standard set of tests.
566    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
567        reference to a subpattern the other side of a comment that contains an
568        opening parenthesis caused either an internal compiling error, or a
569        reference to the wrong subpattern.
572    Version 8.02 19-Mar-2010
573    ------------------------
575    1.  The Unicode data tables have been updated to Unicode 5.2.0.
577    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
578        configured.
580    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
581        original author of that file, following a query about its status.
583    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
584        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
586    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
587        quantifier applied to a forward-referencing subroutine call, could compile
588        incorrect code or give the error "internal error: previously-checked
589        referenced subpattern not found".
591    6.  Both MS Visual Studio and Symbian OS have problems with initializing
592        variables to point to external functions. For these systems, therefore,
593        pcre_malloc etc. are now initialized to local functions that call the
594        relevant global functions.
596    7.  There were two entries missing in the vectors called coptable and poptable
597        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
598        I've fixed the data, and added a kludgy way of testing at compile time that
599        the lengths are correct (equal to the number of opcodes).
601    8.  Following on from 7, I added a similar kludge to check the length of the
602        eint vector in pcreposix.c.
604    9.  Error texts for pcre_compile() are held as one long string to avoid too
605        much relocation at load time. To find a text, the string is searched,
606        counting zeros. There was no check for running off the end of the string,
607        which could happen if a new error number was added without updating the
608        string.
610    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
612    11. \K was not working if it appeared in an atomic group or in a group that
613        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
614        \K is "not well defined" if used in an assertion. PCRE now accepts it if
615        the assertion is positive, but not if it is negative.
617    12. Change 11 fortuitously reduced the size of the stack frame used in the
618        "match()" function of pcre_exec.c by one pointer. Forthcoming
619        implementation of support for (*MARK) will need an extra pointer on the
620        stack; I have reserved it now, so that the stack frame size does not
621        decrease.
623    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
624        item in branch that calls a recursion is a subroutine call - as in the
625        second branch in the above example - was incorrectly given the compile-
626        time error "recursive call could loop indefinitely" because pcre_compile()
627        was not correctly checking the subroutine for matching a non-empty string.
629    14. The checks for overrunning compiling workspace could trigger after an
630        overrun had occurred. This is a "should never occur" error, but it can be
631        triggered by pathological patterns such as hundreds of nested parentheses.
632        The checks now trigger 100 bytes before the end of the workspace.
634    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
637    Version 8.01 19-Jan-2010
638    ------------------------
640    1.  If a pattern contained a conditional subpattern with only one branch (in
641        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
642        computed the wrong minimum data length (which is of course zero for such
643        subpatterns). This could cause incorrect "no match" results.
645    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
646        the pattern is reset in the first branch, pcre_compile() failed with
647        "internal error: code overflow at offset...". This happened only when
648        the reset was to the original external option setting. (An optimization
649        abstracts leading options settings into an external setting, which was the
650        cause of this.)
652    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
653        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
654        assertion pattern did not match (meaning that the assertion was true), it
655        was incorrectly treated as false if the SKIP had been reached during the
656        matching. This also applied to assertions used as conditions.
658    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
659        assertion subpattern, including such a pattern used as a condition,
660        unpredictable results occurred, instead of the error return
663    5.  The C++ GlobalReplace function was not working like Perl for the special
664        situation when an empty string is matched. It now does the fancy magic
665        stuff that is necessary.
667    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
668        removed. (These were left over from very, very early versions of PCRE.)
670    7.  Some cosmetic changes to the code to make life easier when compiling it
671        as part of something else:
673        (a) Change DEBUG to PCRE_DEBUG.
675        (b) In pcre_compile(), rename the member of the "branch_chain" structure
676            called "current" as "current_branch", to prevent a collision with the
677            Linux macro when compiled as a kernel module.
679        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
680            prevent a collision with the Linux macro when compiled as a kernel
681            module.
683    8.  In pcre_compile() there are some checks for integer overflows that used to
684        cast potentially large values to (double). This has been changed to that
685        when building, a check for int64_t is made, and if it is found, it is used
686        instead, thus avoiding the use of floating point arithmetic. (There is no
687        other use of FP in PCRE.) If int64_t is not found, the fallback is to
688        double.
690    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
691        2005 (difference between two addresses compared to an unsigned value).
693    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
694        custom one, because of the following reported problem in Windows:
696          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
697              under Win32.
698          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
699              therefore missing the function definition.
700          - The compiler thus generates a "C" signature for the test function.
701          - The linker fails to find the "C" function.
702          - PCRE fails to configure if asked to do so against libbz2.
704    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
705        messages were output:
707          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
708          rerunning libtoolize, to keep the correct libtool macros in-tree.
709          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
711        I have done both of these things.
713    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
714        most of the time, it *can* run out if it is given a pattern that contains a
715        runaway infinite recursion. I updated the discussion in the pcrestack man
716        page.
718    13. Now that we have gone to the x.xx style of version numbers, the minor
719        version may start with zero. Using 08 or 09 is a bad idea because users
720        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
721        interpreted as invalid octal numbers. I've updated the previous comment in
722        configure.ac, and also added a check that gives an error if 08 or 09 are
723        used.
725    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
726        causing partial matching to fail when the end of the subject matched \W
727        in a UTF-8 pattern where \W was quantified with a minimum of 3.
729    15. There were some discrepancies between the declarations in pcre_internal.h
730        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
731        their definitions. The declarations used "const uschar *" and the
732        definitions used USPTR. Even though USPTR is normally defined as "const
733        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
734        reported that: "This difference in casting confuses some C++ compilers, for
735        example, SunCC recognizes above declarations as different functions and
736        generates broken code for hbpcre." I have changed the declarations to use
737        USPTR.
739    16. GNU libtool is named differently on some systems. The autogen.sh script now
740        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
741        (FreeBSD).
743    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
744        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
745        comment: "Figure out how to create a longlong from a string: strtoll and
746        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
747        instance, but it only takes 2 args instead of 3!"
749    18. A subtle bug concerned with back references has been fixed by a change of
750        specification, with a corresponding code fix. A pattern such as
751        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
752        refers, was giving matches when it shouldn't. For example, xa=xaaa would
753        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
754        same bug. Such groups have to be quantified to be useful, or contained
755        inside another quantified group. (If there's no repetition, the reference
756        can never match.) The problem arises because, having left the group and
757        moved on to the rest of the pattern, a later failure that backtracks into
758        the group uses the captured value from the final iteration of the group
759        rather than the correct earlier one. I have fixed this in PCRE by forcing
760        any group that contains a reference to itself to be an atomic group; that
761        is, there cannot be any backtracking into it once it has completed. This is
762        similar to recursive and subroutine calls.
765    Version 8.00 19-Oct-09
766    ----------------------
768    1.  The table for translating pcre_compile() error codes into POSIX error codes
769        was out-of-date, and there was no check on the pcre_compile() error code
770        being within the table. This could lead to an OK return being given in
771        error.
773    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
774        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
775        in a Windows environment.
777    3.  The pcregrep --count option prints the count for each file even when it is
778        zero, as does GNU grep. However, pcregrep was also printing all files when
779        --files-with-matches was added. Now, when both options are given, it prints
780        counts only for those files that have at least one match. (GNU grep just
781        prints the file name in this circumstance, but including the count seems
782        more useful - otherwise, why use --count?) Also ensured that the
783        combination -clh just lists non-zero counts, with no names.
785    4.  The long form of the pcregrep -F option was incorrectly implemented as
786        --fixed_strings instead of --fixed-strings. This is an incompatible change,
787        but it seems right to fix it, and I didn't think it was worth preserving
788        the old behaviour.
790    5.  The command line items --regex=pattern and --regexp=pattern were not
791        recognized by pcregrep, which required --regex pattern or --regexp pattern
792        (with a space rather than an '='). The man page documented the '=' forms,
793        which are compatible with GNU grep; these now work.
795    6.  No libpcreposix.pc file was created for pkg-config; there was just
796        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
798    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
799        when UCP support is not needed, by modifying the Python script that
800        generates it from Unicode data files. This should not matter if the module
801        is correctly used as a library, but I received one complaint about 50K of
802        unwanted data. My guess is that the person linked everything into his
803        program rather than using a library. Anyway, it does no harm.
805    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
806        was a minimum greater than 1 for a wide character in a possessive
807        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
808        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
809        character. Chaos in the form of incorrect output or a compiling loop could
810        result.
812    9.  The restrictions on what a pattern can contain when partial matching is
813        requested for pcre_exec() have been removed. All patterns can now be
814        partially matched by this function. In addition, if there are at least two
815        slots in the offset vector, the offset of the earliest inspected character
816        for the match and the offset of the end of the subject are set in them when
817        PCRE_ERROR_PARTIAL is returned.
819    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
820        synonymous with PCRE_PARTIAL, for backwards compatibility, and
821        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
822        and may be more useful for multi-segment matching.
824    11. Partial matching with pcre_exec() is now more intuitive. A partial match
825        used to be given if ever the end of the subject was reached; now it is
826        given only if matching could not proceed because another character was
827        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
828        string "Z", which now yields "no match" instead of "partial match". In the
829        case of pcre_dfa_exec(), "no match" is given if every matching path for the
830        final character ended with (*FAIL).
832    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
833        if the pattern had a "must contain" character that was already found in the
834        earlier partial match, unless partial matching was again requested. For
835        example, with the pattern /dog.(body)?/, the "must contain" character is
836        "g". If the first part-match was for the string "dog", restarting with
837        "sbody" failed. This bug has been fixed.
839    13. The string returned by pcre_dfa_exec() after a partial match has been
840        changed so that it starts at the first inspected character rather than the
841        first character of the match. This makes a difference only if the pattern
842        starts with a lookbehind assertion or \b or \B (\K is not supported by
843        pcre_dfa_exec()). It's an incompatible change, but it makes the two
844        matching functions compatible, and I think it's the right thing to do.
846    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
847        so that the demonstration program is easily available in environments where
848        PCRE has not been installed from source.
850    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
851        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
852        library.
854    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
855        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
856        is not the first non-POSIX option to be added. Clearly some people find
857        these options useful.
859    17. If a caller to the POSIX matching function regexec() passes a non-zero
860        value for nmatch with a NULL value for pmatch, the value of
861        nmatch is forced to zero.
863    18. RunGrepTest did not have a test for the availability of the -u option of
864        the diff command, as RunTest does. It now checks in the same way as
865        RunTest, and also checks for the -b option.
867    19. If an odd number of negated classes containing just a single character
868        interposed, within parentheses, between a forward reference to a named
869        subpattern and the definition of the subpattern, compilation crashed with
870        an internal error, complaining that it could not find the referenced
871        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
872        [The bug was that it was starting one character too far in when skipping
873        over the character class, thus treating the ] as data rather than
874        terminating the class. This meant it could skip too much.]
876    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
877        /g option in pcretest when the pattern contains \K, which makes it possible
878        to have an empty string match not at the start, even when the pattern is
879        anchored. Updated pcretest and pcredemo to use this option.
881    21. If the maximum number of capturing subpatterns in a recursion was greater
882        than the maximum at the outer level, the higher number was returned, but
883        with unset values at the outer level. The correct (outer level) value is
884        now given.
886    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
887        PCRE did not set those parentheses (unlike Perl). I have now found a way to
888        make it do so. The string so far is captured, making this feature
889        compatible with Perl.
891    23. The tests have been re-organized, adding tests 11 and 12, to make it
892        possible to check the Perl 5.10 features against Perl 5.10.
894    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
895        pattern matches a fixed length string. PCRE did not allow this; now it
896        does. Neither allows recursion.
898    25. I finally figured out how to implement a request to provide the minimum
899        length of subject string that was needed in order to match a given pattern.
900        (It was back references and recursion that I had previously got hung up
901        on.) This code has now been added to pcre_study(); it finds a lower bound
902        to the length of subject needed. It is not necessarily the greatest lower
903        bound, but using it to avoid searching strings that are too short does give
904        some useful speed-ups. The value is available to calling programs via
905        pcre_fullinfo().
907    26. While implementing 25, I discovered to my embarrassment that pcretest had
908        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
909        study optimizations had never been tested with that matching function.
910        Oops. What is worse, even when it was passed study data, there was a bug in
911        pcre_dfa_exec() that meant it never actually used it. Double oops. There
912        were also very few tests of studied patterns with pcre_dfa_exec().
914    27. If (?| is used to create subpatterns with duplicate numbers, they are now
915        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
916        on the other side of the coin, they are no longer allowed to have different
917        names, because these cannot be distinguished in PCRE, and this has caused
918        confusion. (This is a difference from Perl.)
920    28. When duplicate subpattern names are present (necessarily with different
921        numbers, as required by 27 above), and a test is made by name in a
922        conditional pattern, either for a subpattern having been matched, or for
923        recursion in such a pattern, all the associated numbered subpatterns are
924        tested, and the overall condition is true if the condition is true for any
925        one of them. This is the way Perl works, and is also more like the way
926        testing by number works.
929    Version 7.9 11-Apr-09
930    ---------------------
932    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
933        (pcretest), all targets were linked against these libraries. This included
934        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
935        libraries. This caused unwanted dependencies to be created. This problem
936        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
937        pcretest is linked with readline.
939    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
940        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
941        moved outside it again, because FALSE and TRUE are already defined in AIX,
942        but BOOL is not.
944    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
945        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
947    4.  The pcregrep documentation said spaces were inserted as well as colons (or
948        hyphens) following file names and line numbers when outputting matching
949        lines. This is not true; no spaces are inserted. I have also clarified the
950        wording for the --colour (or --color) option.
952    5.  In pcregrep, when --colour was used with -o, the list of matching strings
953        was not coloured; this is different to GNU grep, so I have changed it to be
954        the same.
956    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
957        each matching line was coloured. Now it goes on to look for further matches
958        of any of the test patterns, which is the same behaviour as GNU grep.
960    7.  A pattern that could match an empty string could cause pcregrep to loop; it
961        doesn't make sense to accept an empty string match in pcregrep, so I have
962        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
963        seems to be how GNU grep behaves.
965    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
966        start or after a newline", because the conditional assertion was not being
967        correctly handled. The rule now is that both the assertion and what follows
968        in the first alternative must satisfy the test.
970    9.  If auto-callout was enabled in a pattern with a conditional group whose
971        condition was an assertion, PCRE could crash during matching, both with
972        pcre_exec() and pcre_dfa_exec().
974    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
975        used for matching.
977    11. Unicode property support in character classes was not working for
978        characters (bytes) greater than 127 when not in UTF-8 mode.
980    12. Added the -M command line option to pcretest.
982    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
984    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
986    16. Added comments and documentation about mis-use of no_arg in the C++
987        wrapper.
989    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
990        from Martin Jerabek that uses macro names for all relevant character and
991        string constants.
993    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
994        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
995        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
996        these, but not everybody uses configure.
998    19. A conditional group that had only one branch was not being correctly
999        recognized as an item that could match an empty string. This meant that an
1000        enclosing group might also not be so recognized, causing infinite looping
1001        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
1002        with the subject "ab", where knowledge that the repeated group can match
1003        nothing is needed in order to break the loop.
1005    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
1006        exec(), but without supplying a callout function, matching went wrong.
1008    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
1009        leak if the size of the offset vector was greater than 30. When the vector
1010        is smaller, the saved offsets during recursion go onto a local stack
1011        vector, but for larger vectors malloc() is used. It was failing to free
1012        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
1013        error, in fact).
1015    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
1016        heapframe that is used only when UTF-8 support is enabled. This caused no
1017        problem, but was untidy.
1019    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
1020        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
1021        included within another project.
1023    24. Steven Van Ingelgem's patches to add more options to the CMake support,
1024        slightly modified by me:
1026          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
1027              not building pcregrep.
1029          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
1030              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
1032    25. Forward references, both numeric and by name, in patterns that made use of
1033        duplicate group numbers, could behave incorrectly or give incorrect errors,
1034        because when scanning forward to find the reference group, PCRE was not
1035        taking into account the duplicate group numbers. A pattern such as
1036        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
1038    26. Changed a few more instances of "const unsigned char *" to USPTR, making
1039        the feature of a custom pointer more persuasive (as requested by a user).
1041    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
1042        pcretest.c, inside #ifndefs, because it seems they are sometimes already
1043        pre-defined.
1045    28. Added support for (*UTF8) at the start of a pattern.
1047    29. Arrange for flags added by the "release type" setting in CMake to be shown
1048        in the configuration summary.
1051    Version 7.8 05-Sep-08
1052    ---------------------
1054    1.  Replaced UCP searching code with optimized version as implemented for Ad
1055        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
1056        stage table and inline lookup instead of a function, giving speed ups of 2
1057        to 5 times on some simple patterns that I tested. Permission was given to
1058        distribute the MultiStage2.py script that generates the tables (it's not in
1059        the tarball, but is in the Subversion repository).
1061    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
1062        scripts.
1064    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
1065        a group with a zero qualifier. The result of the study could be incorrect,
1066        or the function might crash, depending on the pattern.
1068    4.  Caseless matching was not working for non-ASCII characters in back
1069        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
1070        It now works when Unicode Property Support is available.
1072    5.  In pcretest, an escape such as \x{de} in the data was always generating
1073        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
1074        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
1075        truncation.
1077    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
1079    7.  Added two (int) casts to pcregrep when printing the difference of two
1080        pointers, in case they are 64-bit values.
1082    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
1083        test 2 if it fails.
1085    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
1086        and a #define of that name to empty if it is not externally set. This is to
1087        allow users of MSVC to set it if necessary.
1089    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
1090        the convenience functions in the pcre_get.c source file.
1092    11. An option change at the start of a pattern that had top-level alternatives
1093        could cause overwriting and/or a crash. This command provoked a crash in
1094        some environments:
1096          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
1098        This potential security problem was recorded as CVE-2008-2371.
1100    12. For a pattern where the match had to start at the beginning or immediately
1101        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
1102        pcre_dfa_exec() could read past the end of the passed subject if there was
1103        no match. To help with detecting such bugs (e.g. with valgrind), I modified
1104        pcretest so that it places the subject at the end of its malloc-ed buffer.
1106    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
1107        exec() might read past the end of the data buffer in UTF-8 mode.
1109    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
1110        the data contained the byte 0x85 as part of a UTF-8 character within its
1111        first line. This applied both to normal and DFA matching.
1113    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
1114        /^[^d]*?$/8 failed to match "abc".
1116    16. Added a missing copyright notice to pcrecpp_internal.h.
1118    17. Make it more clear in the documentation that values returned from
1119        pcre_exec() in ovector are byte offsets, not character counts.
1121    18. Tidied a few places to stop certain compilers from issuing warnings.
1123    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
1124        supplied by Stefan Weber. I made a further small update for 7.8 because
1125        there is a change of source arrangements: the pcre_searchfuncs.c module is
1126        replaced by pcre_ucd.c.
1129    Version 7.7 07-May-08
1130    ---------------------
1132    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
1133        a string to a long long, pretend we don't even have a long long." This is
1134        done by checking for the strtoq, strtoll, and _strtoi64 functions.
1136    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
1137        pre-7.6 versions, which defined a global no_arg variable instead of putting
1138        it in the RE class. (See also #8 below.)
1140    3.  Remove a line of dead code, identified by coverity and reported by Nuno
1141        Lopes.
1143    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
1145        (1) The include/exclude patterns were being applied to the whole pathnames
1146            of files, instead of just to the final components.
1148        (2) If there was more than one level of directory, the subdirectories were
1149            skipped unless they satisfied the include/exclude conditions. This is
1150            inconsistent with GNU grep (and could even be seen as contrary to the
1151            pcregrep specification - which I improved to make it absolutely clear).
1152            The action now is always to scan all levels of directory, and just
1153            apply the include/exclude patterns to regular files.
1155    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
1156        --exclude_dir in the tests to avoid scanning .svn directories.
1158    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
1159        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
1160        doesn't support NULs in patterns.
1162    7.  Added some missing "const"s to declarations of static tables in
1163        pcre_compile.c and pcre_dfa_exec.c.
1165    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
1166        caused by fix #2  above. (Subsequently also a second patch to fix the
1167        first patch. And a third patch - this was a messy problem.)
1169    9.  Applied Craig's patch to remove the use of push_back().
1171    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
1172        matching function regexec().
1174    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
1175        which, however, unlike Perl's \g{...}, are subroutine calls, not back
1176        references. PCRE supports relative numbers with this syntax (I don't think
1177        Oniguruma does).
1179    12. Previously, a group with a zero repeat such as (...){0} was completely
1180        omitted from the compiled regex. However, this means that if the group
1181        was called as a subroutine from elsewhere in the pattern, things went wrong
1182        (an internal error was given). Such groups are now left in the compiled
1183        pattern, with a new opcode that causes them to be skipped at execution
1184        time.
1186    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
1187        to the way PCRE behaves:
1189        (a) A lone ] character is dis-allowed (Perl treats it as data).
1191        (b) A back reference to an unmatched subpattern matches an empty string
1192            (Perl fails the current match path).
1194        (c) A data ] in a character class must be notated as \] because if the
1195            first data character in a class is ], it defines an empty class. (In
1196            Perl it is not possible to have an empty class.) The empty class []
1197            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
1198            The negative empty class [^] matches any one character, independently
1199            of the DOTALL setting.
1201    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
1202        non-existent subpattern following a character class starting with ']' and
1203        containing () gave an internal compiling error instead of "reference to
1204        non-existent subpattern". Fortunately, when the pattern did exist, the
1205        compiled code was correct. (When scanning forwards to check for the
1206        existencd of the subpattern, it was treating the data ']' as terminating
1207        the class, so got the count wrong. When actually compiling, the reference
1208        was subsequently set up correctly.)
1210    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
1211        it was being rejected as not supported by pcre_dfa_exec(), even though
1212        other assertions are supported. I have made pcre_dfa_exec() support
1213        (*FAIL).
1215    16. The implementation of 13c above involved the invention of a new opcode,
1216        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
1217        cannot be changed at match time, I realized I could make a small
1218        improvement to matching performance by compiling OP_ALLANY instead of
1219        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
1220        on the OP_ANY path.
1222    17. Compiling pcretest on Windows with readline support failed without the
1223        following two fixes: (1) Make the unistd.h include conditional on
1224        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
1226    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
1227        ncurses library to be included for pcretest when ReadLine support is
1228        requested, but also to allow for it to be overridden. This patch came from
1229        Daniel Bergström.
1231    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
1232        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
1233        any errors with the current Unicode tables. Thanks to Peter Kankowski for
1234        spotting this.
1237    Version 7.6 28-Jan-08
1238    ---------------------
1240    1.  A character class containing a very large number of characters with
1241        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
1242        overflow.
1244    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
1245        HAVE_LONG_LONG is not defined.
1247    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
1248        bring them up to date and include new features. This patch includes:
1250        - Fixed PH's badly added libz and libbz2 support.
1251        - Fixed a problem with static linking.
1252        - Added pcredemo. [But later removed - see 7 below.]
1253        - Fixed dftables problem and added an option.
1254        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
1255            HAVE_LONG_LONG.
1256        - Added readline support for pcretest.
1257        - Added an listing of the option settings after cmake has run.
1259    4.  A user submitted a patch to Makefile that makes it easy to create
1260        "pcre.dll" under mingw when using Configure/Make. I added stuff to
1261        Makefile.am that cause it to include this special target, without
1262        affecting anything else. Note that the same mingw target plus all
1263        the other distribution libraries and programs are now supported
1264        when configuring with CMake (see 6 below) instead of with
1265        Configure/Make.
1267    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
1268        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
1269        exported in the Windows port". It has not yet been confirmed that the patch
1270        solves the problem, but it does no harm.
1272    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
1273        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
1274        with CMake, and also correct the comment about stack recursion.
1276    7.  Remove the automatic building of pcredemo from the ./configure system and
1277        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
1278        of a program that users should build themselves after PCRE is installed, so
1279        building it automatically is not really right. What is more, it gave
1280        trouble in some build environments.
1282    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
1285    Version 7.5 10-Jan-08
1286    ---------------------
1288    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
1289        values in parens when parsing an RE using the C++ wrapper."
1291    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
1292        Characters greater than 255 were excluded from the class instead of being
1293        included.
1295    3.  The same bug as (2) above applied to negated POSIX classes such as
1296        [:^space:].
1298    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
1299        defined or documented. It seems to have been a typo for PCRE_STATIC, so
1300        I have changed it.
1302    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
1303        first named subpattern) and a construct such as (?&a) would reference the
1304        first named subpattern whose name started with "a" (in other words, the
1305        length check was missing). Both these problems are fixed. "Subpattern name
1306        expected" is now given for (?&) (a zero-length name), and this patch also
1307        makes it give the same error for \k'' (previously it complained that that
1308        was a reference to a non-existent subpattern).
1310    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
1311        this is right because (?- can be followed by option settings as well as by
1312        digits. I have, however, made the messages clearer.
1314    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
1315        than the number used in the conditional) now cause a compile-time error.
1316        This is actually not compatible with Perl, which accepts such patterns, but
1317        treats the conditional as always being FALSE (as PCRE used to), but it
1318        seems to me that giving a diagnostic is better.
1320    8.  Change "alphameric" to the more common word "alphanumeric" in comments
1321        and messages.
1323    9.  Fix two occurrences of "backslash" in comments that should have been
1324        "backspace".
1326    10. Remove two redundant lines of code that can never be obeyed (their function
1327        was moved elsewhere).
1329    11. The program that makes PCRE's Unicode character property table had a bug
1330        which caused it to generate incorrect table entries for sequences of
1331        characters that have the same character type, but are in different scripts.
1332        It amalgamated them into a single range, with the script of the first of
1333        them. In other words, some characters were in the wrong script. There were
1334        thirteen such cases, affecting characters in the following ranges:
1336          U+002b0 - U+002c1
1337          U+0060c - U+0060d
1338          U+0061e - U+00612
1339          U+0064b - U+0065e
1340          U+0074d - U+0076d
1341          U+01800 - U+01805
1342          U+01d00 - U+01d77
1343          U+01d9b - U+01dbf
1344          U+0200b - U+0200f
1345          U+030fc - U+030fe
1346          U+03260 - U+0327f
1347          U+0fb46 - U+0fbb1
1348          U+10450 - U+1049d
1350    12. The -o option (show only the matching part of a line) for pcregrep was not
1351        compatible with GNU grep in that, if there was more than one match in a
1352        line, it showed only the first of them. It now behaves in the same way as
1353        GNU grep.
1355    13. If the -o and -v options were combined for pcregrep, it printed a blank
1356        line for every non-matching line. GNU grep prints nothing, and pcregrep now
1357        does the same. The return code can be used to tell if there were any
1358        non-matching lines.
1360    14. Added --file-offsets and --line-offsets to pcregrep.
1362    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
1363        infinitely looping recursion. The bug was that positive lookaheads were not
1364        being skipped when checking for a possible empty match (negative lookaheads
1365        and both kinds of lookbehind were skipped).
1367    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
1368        inclusion of <windows.h> to before rather than after the definition of
1369        INVALID_FILE_ATTRIBUTES (patch from David Byron).
1371    17. Specifying a possessive quantifier with a specific limit for a Unicode
1372        character property caused pcre_compile() to compile bad code, which led at
1373        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
1374        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
1375        caused the error; without that there was no problem.
1377    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
1379    19. Added --enable-pcretest-libreadline.
1381    20. In pcrecpp.cc, the variable 'count' was incremented twice in
1382        RE::GlobalReplace(). As a result, the number of replacements returned was
1383        double what it should be. I removed one of the increments, but Craig sent a
1384        later patch that removed the other one (the right fix) and added unit tests
1385        that check the return values (which was not done before).
1387    21. Several CMake things:
1389        (1) Arranged that, when cmake is used on Unix, the libraries end up with
1390            the names libpcre and libpcreposix, not just pcre and pcreposix.
1392        (2) The above change means that pcretest and pcregrep are now correctly
1393            linked with the newly-built libraries, not previously installed ones.
1397    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
1398        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
1399        UTF-8 newline character). The key issue is that the pattern starts .*;
1400        this means that the match must be either at the beginning, or after a
1401        newline. The bug was in the code for advancing after a failed match and
1402        checking that the new position followed a newline. It was not taking
1403        account of UTF-8 characters correctly.
1405    23. PCRE was behaving differently from Perl in the way it recognized POSIX
1406        character classes. PCRE was not treating the sequence [:...:] as a
1407        character class unless the ... were all letters. Perl, however, seems to
1408        allow any characters between [: and :], though of course it rejects as
1409        unknown any "names" that contain non-letters, because all the known class
1410        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
1411        for example, whereas PCRE did not - it did not recognize a POSIX character
1412        class. This seemed a bit dangerous, so the code has been changed to be
1413        closer to Perl. The behaviour is not identical to Perl, because PCRE will
1414        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
1415        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
1416        Perl does, and where it didn't before.
1418    24. Rewrite so as to remove the single use of %n from pcregrep because in some
1419        Windows environments %n is disabled by default.
1422    Version 7.4 21-Sep-07
1423  ---------------------  ---------------------
1425  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
# Line 32  Version 7.4 10-Sep-07 Line 1450  Version 7.4 10-Sep-07
1450      compatibility, even though it is no longer used.      compatibility, even though it is no longer used.
1452  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
1453      strtoull to pcrecpp.cc to select the available functions in WIN32 when the      strtoull to pcrecpp.cc to select the available functions in WIN32 when the
1454      windows.h file is present (where different names are used).      windows.h file is present (where different names are used). [This was
1455        reversed later after testing - see 16 below.]
1457  8.  Changed all #include <config.h> to #include "config.h". There were also  8.  Changed all #include <config.h> to #include "config.h". There were also
1458      some further <pcre.h> cases that I changed to "pcre.h".      some further <pcre.h> cases that I changed to "pcre.h".
# Line 63  Version 7.4 10-Sep-07 Line 1482  Version 7.4 10-Sep-07
1482  13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously  13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
1483      checked only for CRLF.      checked only for CRLF.
1485    14. Added casts to pcretest.c to avoid compiler warnings.
1487    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
1489    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
1490        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
1491        entirely. This removes changes made in 7 above.
1493    17. The CMake files have been updated, and there is now more information about
1494        building with CMake in the NON-UNIX-USE document.
1497  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07
1498  ---------------------  ---------------------

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