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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.02 01-Mar-2010  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 captured
14       substring, but while checking the failing first alternative, substring 1 is
15       temporarily captured. If the output vector supplied to pcre_exec() was not
16       big enough for this capture, the yield of the function was still zero
17       ("insufficient space for captured substrings"). This cannot be totally fixed
18       without adding another stack variable, which seems a lot of expense for a
19       edge case. However, I have improved the situation in cases such as
20       /(a)(b)x|abc/ matched against "abc", where the return code indicates that
21       fewer than the maximum number of slots in the ovector have been set.
23    3. Related to (2) above: when there are more back references in a pattern than
24       slots in the output vector, pcre_exec() uses temporary memory during
25       matching, and copies in the captures as far as possible afterwards. It was
26       using the entire output vector, but this conflicts with the specification
27       that only 2/3 is used for passing back captured substrings. Now it uses only
28       the first 2/3, for compatibility. This is, of course, another edge case.
30    4. Zoltan Herczeg's just-in-time compiler support has been integrated into the
31       main code base, and can be used by building with --enable-jit. When this is
32       done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
33       runtime --no-jit option is given.
35    5. When the number of matches in a pcre_dfa_exec() run exactly filled the
36       ovector, the return from the function was zero, implying that there were
37       other matches that did not fit. The correct "exactly full" value is now
38       returned.
40    6. If a subpattern that was called recursively or as a subroutine contained
41       (*PRUNE) or any other control that caused it to give a non-standard return,
42       invalid errors such as "Error -26 (nested recursion at the same subject
43       position)" or even infinite loops could occur.
46    Version 8.13 16-Aug-2011
47    ------------------------
49    1.  The Unicode data tables have been updated to Unicode 6.0.0.
51    2.  Two minor typos in pcre_internal.h have been fixed.
53    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
54        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
55        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
57    4.  There were a number of related bugs in the code for matching backrefences
58        caselessly in UTF-8 mode when codes for the characters concerned were
59        different numbers of bytes. For example, U+023A and U+2C65 are an upper
60        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
61        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
62        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
63        2-byte code at the end of the subject (it thought there wasn't enough data
64        left).
66    5.  Comprehensive information about what went wrong is now returned by
67        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
68        as the output vector has at least 2 elements. The offset of the start of
69        the failing character and a reason code are placed in the vector.
71    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
72        now returned is for the first byte of the failing character, instead of the
73        last byte inspected. This is an incompatible change, but I hope it is small
74        enough not to be a problem. It makes the returned offset consistent with
75        pcre_exec() and pcre_dfa_exec().
77    7.  pcretest now gives a text phrase as well as the error number when
78        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
79        failure, the offset and reason code are output.
81    8.  When \R was used with a maximizing quantifier it failed to skip backwards
82        over a \r\n pair if the subsequent match failed. Instead, it just skipped
83        back over a single character (\n). This seems wrong (because it treated the
84        two characters as a single entity when going forwards), conflicts with the
85        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
86        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
87        has been changed.
89    9.  Some internal refactoring has changed the processing so that the handling
90        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
91        time (the PCRE_DOTALL option was changed this way some time ago: version
92        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
93        which was always a bit of a fudge. It also means that there is one less
94        argument for the match() function, which reduces its stack requirements
95        slightly. This change also fixes an incompatibility with Perl: the pattern
96        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
98    10. More internal refactoring has drastically reduced the number of recursive
99        calls to match() for possessively repeated groups such as (abc)++ when
100        using pcre_exec().
102    11. While implementing 10, a number of bugs in the handling of groups were
103        discovered and fixed:
105        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
106        (a|)*(?1) gave a compile-time internal error.
107        ((a|)+)+  did not notice that the outer group could match an empty string.
108        (^a|^)+   was not marked as anchored.
109        (.*a|.*)+ was not marked as matching at start or after a newline.
111    12. Yet more internal refactoring has removed another argument from the match()
112        function. Special calls to this function are now indicated by setting a
113        value in a variable in the "match data" data block.
115    13. Be more explicit in pcre_study() instead of relying on "default" for
116        opcodes that mean there is no starting character; this means that when new
117        ones are added and accidentally left out of pcre_study(), testing should
118        pick them up.
120    14. The -s option of pcretest has been documented for ages as being an old
121        synonym of -m (show memory usage). I have changed it to mean "force study
122        for every regex", that is, assume /S for every regex. This is similar to -i
123        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
124        using it. It makes it easier to run collections of tests with and without
125        study enabled, and thereby test pcre_study() more easily. All the standard
126        tests are now run with and without -s (but some patterns can be marked as
127        "never study" - see 20 below).
129    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
130        restoration of the capturing data to the outer values was not happening
131        correctly.
133    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
134        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
135        pattern had matched an empty string, and so incorrectly returned a no
136        match.
138    17. There was optimizing code for the last branch of non-capturing parentheses,
139        and also for the obeyed branch of a conditional subexpression, which used
140        tail recursion to cut down on stack usage. Unfortunately, now that there is
141        the possibility of (*THEN) occurring in these branches, tail recursion is
142        no longer possible because the return has to be checked for (*THEN). These
143        two optimizations have therefore been removed.
145    18. If a pattern containing \R was studied, it was assumed that \R always
146        matched two bytes, thus causing the minimum subject length to be
147        incorrectly computed because \R can also match just one byte.
149    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
150        was incorrectly computed.
152    20. If /S is present twice on a test pattern in pcretest input, it now
153        *disables* studying, thereby overriding the use of -s on the command line
154        (see 14 above). This is necessary for one or two tests to keep the output
155        identical in both cases.
157    21. When (*ACCEPT) was used in an assertion that matched an empty string and
158        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
160    22. When an atomic group that contained a capturing parenthesis was
161        successfully matched, but the branch in which it appeared failed, the
162        capturing was not being forgotten if a higher numbered group was later
163        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
164        group 1 to "a", when in fact it should be unset. This applied to multi-
165        branched capturing and non-capturing groups, repeated or not, and also to
166        positive assertions (capturing in negative assertions does not happen
167        in PCRE) and also to nested atomic groups.
169    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
170        subject after a captured substring, to make it easier to tell which of a
171        number of identical substrings has been captured.
173    24. The way atomic groups are processed by pcre_exec() has been changed so that
174        if they are repeated, backtracking one repetition now resets captured
175        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
176        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
177        "aaa". Previously, it would have been "a". As part of this code
178        refactoring, the way recursive calls are handled has also been changed.
180    25. If an assertion condition captured any substrings, they were not passed
181        back unless some other capturing happened later. For example, if
182        (?(?=(a))a) was matched against "a", no capturing was returned.
184    26. When studying a pattern that contained subroutine calls or assertions,
185        the code for finding the minimum length of a possible match was handling
186        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
187        group 1 called group 2 while simultaneously a separate group 2 called group
188        1). A stack overflow occurred in this case. I have fixed this by limiting
189        the recursion depth to 10.
191    27. Updated RunTest.bat in the distribution to the version supplied by Tom
192        Fortmann. This supports explicit test numbers on the command line, and has
193        argument validation and error reporting.
195    28. An instance of \X with an unlimited repeat could fail if at any point the
196        first character it looked at was a mark character.
198    29. Some minor code refactoring concerning Unicode properties and scripts
199        should reduce the stack requirement of match() slightly.
201    30. Added the '=' option to pcretest to check the setting of unused capturing
202        slots at the end of the pattern, which are documented as being -1, but are
203        not included in the return count.
205    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
206        compiled something random. Now it gives a compile-time error (as does
207        Perl).
209    32. A *MARK encountered during the processing of a positive assertion is now
210        recorded and passed back (compatible with Perl).
212    33. If --only-matching or --colour was set on a pcregrep call whose pattern
213        had alternative anchored branches, the search for a second match in a line
214        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
215        matched the line "0102" twice. The same bug affected patterns that started
216        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
217        twice.
219    34. Previously, PCRE did not allow quantification of assertions. However, Perl
220        does, and because of capturing effects, quantifying parenthesized
221        assertions may at times be useful. Quantifiers are now allowed for
222        parenthesized assertions.
224    35. A minor code tidy in pcre_compile() when checking options for \R usage.
226    36. \g was being checked for fancy things in a character class, when it should
227        just be a literal "g".
229    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
230        appearance of a nested POSIX class supersedes an apparent external class.
231        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
232        unescaped square brackets may also appear as part of class names. For
233        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
234        more like Perl. (But see 8.20/1 above.)
236    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
237        was because it thought it was \N{name}, which is not supported).
239    39. Add minix to OS list not supporting the -S option in pcretest.
241    40. PCRE tries to detect cases of infinite recursion at compile time, but it
242        cannot analyze patterns in sufficient detail to catch mutual recursions
243        such as ((?1))((?2)). There is now a runtime test that gives an error if a
244        subgroup is called recursively as a subpattern for a second time at the
245        same position in the subject string. In previous releases this might have
246        been caught by the recursion limit, or it might have run out of stack.
248    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
249        happen only once. PCRE was, however incorrectly giving a compile time error
250        "recursive call could loop indefinitely" because it cannot analyze the
251        pattern in sufficient detail. The compile time test no longer happens when
252        PCRE is compiling a conditional subpattern, but actual runaway loops are
253        now caught at runtime (see 40 above).
255    42. It seems that Perl allows any characters other than a closing parenthesis
256        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
257        has been changed to be the same.
259    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
260        as not to get warnings when autogen.sh is called. Also changed
261        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
263    44. To help people who use pcregrep to scan files containing exceedingly long
264        lines, the following changes have been made:
266        (a) The default value of the buffer size parameter has been increased from
267            8K to 20K. (The actual buffer used is three times this size.)
269        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
270            PCRE is built.
272        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
273            to be set at run time.
275        (d) Numerical values in pcregrep options can be followed by K or M, for
276            example --buffer-size=50K.
278        (e) If a line being scanned overflows pcregrep's buffer, an error is now
279            given and the return code is set to 2.
281    45. Add a pointer to the latest mark to the callout data block.
283    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
284        partial match of an empty string instead of no match. This was specific to
285        the use of ".".
287    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
288        complete match instead of a partial match. This bug was dependent on both
289        the PCRE_UTF8 and PCRE_DOTALL options being set.
291    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
292        starting byte set, because \b was not being ignored.
295    Version 8.12 15-Jan-2011
296    ------------------------
298    1.  Fixed some typos in the markup of the man pages, and wrote a script that
299        checks for such things as part of the documentation building process.
301    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
302        --match-limit and --recursion-limit options (added for 8.11). In
303        particular, this made one of the standard tests fail. (The integer value
304        went into the wrong half of a long int.)
306    3.  If the --colour option was given to pcregrep with -v (invert match), it
307        did strange things, either producing crazy output, or crashing. It should,
308        of course, ignore a request for colour when reporting lines that do not
309        match.
311    4.  Another pcregrep bug caused similar problems if --colour was specified with
312        -M (multiline) and the pattern match finished with a line ending.
314    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
315        matched in multiline mode, the following line was shown as part of the
316        match. This seems wrong, so I have changed it.
318    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
319        the check for further matches in the same line (so they could be coloured)
320        to overrun the end of the current line. If another match was found, it was
321        incorrectly shown (and then shown again when found in the next line).
323    7.  If pcregrep was compiled under Windows, there was a reference to the
324        function pcregrep_exit() before it was defined. I am assuming this was
325        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
326        reported by a user. I've moved the definition above the reference.
329    Version 8.11 10-Dec-2010
330    ------------------------
332    1.  (*THEN) was not working properly if there were untried alternatives prior
333        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
334        backtracked to try for "b" instead of moving to the next alternative branch
335        at the same level (in this case, to look for "c"). The Perl documentation
336        is clear that when (*THEN) is backtracked onto, it goes to the "next
337        alternative in the innermost enclosing group".
339    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
340        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
341        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
342        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
343        (*THEN).
345    3.  If \s appeared in a character class, it removed the VT character from
346        the class, even if it had been included by some previous item, for example
347        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
348        of \s, but is part of the POSIX "space" class.)
350    4.  A partial match never returns an empty string (because you can always
351        match an empty string at the end of the subject); however the checking for
352        an empty string was starting at the "start of match" point. This has been
353        changed to the "earliest inspected character" point, because the returned
354        data for a partial match starts at this character. This means that, for
355        example, /(?<=abc)def/ gives a partial match for the subject "abc"
356        (previously it gave "no match").
358    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
359        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
360        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
361        has an implication that the given string is incomplete (because a partial
362        match is preferred over a full match). For this reason, these items now
363        give a partial match in this situation. [Aside: previously, the one case
364        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
365        match rather than a full match, which was wrong by the old rules, but is
366        now correct.]
368    6.  There was a bug in the handling of #-introduced comments, recognized when
369        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
370        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
371        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
372        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
373        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
374        places in pcre_compile().
376    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
377        comments when looking ahead for named forward references to subpatterns,
378        the only newline sequence it recognized was NL. It now handles newlines
379        according to the set newline convention.
381    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
382        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
383        cater for a lack of strerror(). These oversights have been fixed.
385    9.  Added --match-limit and --recursion-limit to pcregrep.
387    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
389    11. When the -o option was used, pcregrep was setting a return code of 1, even
390        when matches were found, and --line-buffered was not being honoured.
392    12. Added an optional parentheses number to the -o and --only-matching options
393        of pcregrep.
395    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
396        can match an empty string. The code to do it in pcretest and pcredemo
397        needed fixing:
399        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
400            only one byte after an empty string match just before CRLF (this case
401            just got forgotten; "any" and "anycrlf" were OK).
403        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
404            mode when an empty string match preceded an ASCII character followed by
405            a non-ASCII character. (The code for advancing by one character rather
406            than one byte was nonsense.)
408        (c) The pcredemo.c sample program did not have any code at all to handle
409            the cases when CRLF is a valid newline sequence.
411    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
412        as a starting offset was within the subject string. There is now a new
413        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
414        negative or greater than the length of the string. In order to test this,
415        pcretest is extended to allow the setting of negative starting offsets.
417    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
418        starting offset points to the beginning of a UTF-8 character was
419        unnecessarily clumsy. I tidied it up.
421    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
422        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
424    17. Nobody had reported that the --include_dir option, which was added in
425        release 7.7 should have been called --include-dir (hyphen, not underscore)
426        for compatibility with GNU grep. I have changed it to --include-dir, but
427        left --include_dir as an undocumented synonym, and the same for
428        --exclude-dir, though that is not available in GNU grep, at least as of
429        release 2.5.4.
431    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
432        characters from a string of bytes) have been redefined so as not to use
433        loops, in order to improve performance in some environments. At the same
434        time, I abstracted some of the common code into auxiliary macros to save
435        repetition (this should not affect the compiled code).
437    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
438        compile-time error is now given if \c is not followed by an ASCII
439        character, that is, a byte less than 128. (In EBCDIC mode, the code is
440        different, and any byte value is allowed.)
442    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
443        START_OPTIMIZE option, which is now allowed at compile time - but just
444        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
445        to pcregrep and other applications that have no direct access to PCRE
446        options. The new /Y option in pcretest sets this option when calling
447        pcre_compile().
449    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
450        back references. Groups containing recursive back references were forced to
451        be atomic by that change, but in the case of named groups, the amount of
452        memory required was incorrectly computed, leading to "Failed: internal
453        error: code overflow". This has been fixed.
455    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
456        pcretest.c, to avoid build problems in some Borland environments.
459    Version 8.10 25-Jun-2010
460    ------------------------
462    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
463        THEN.
465    2.  (*ACCEPT) was not working when inside an atomic group.
467    3.  Inside a character class, \B is treated as a literal by default, but
468        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
469        causes the error). The code is unchanged, but I tidied the documentation.
471    4.  Inside a character class, PCRE always treated \R and \X as literals,
472        whereas Perl faults them if its -w option is set. I have changed PCRE so
473        that it faults them when PCRE_EXTRA is set.
475    5.  Added support for \N, which always matches any character other than
476        newline. (It is the same as "." when PCRE_DOTALL is not set.)
478    6.  When compiling pcregrep with newer versions of gcc which may have
479        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
480        declared with attribute warn_unused_result" were given. Just casting the
481        result to (void) does not stop the warnings; a more elaborate fudge is
482        needed. I've used a macro to implement this.
484    7.  Minor change to pcretest.c to avoid a compiler warning.
486    8.  Added four artifical Unicode properties to help with an option to make
487        \s etc use properties (see next item). The new properties are: Xan
488        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
490    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
491        use Unicode properties. (*UCP) at the start of a pattern can be used to set
492        this option. Modified pcretest to add /W to test this facility. Added
493        REG_UCP to make it available via the POSIX interface.
495    10. Added --line-buffered to pcregrep.
497    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
498        studied, and the match started with a letter with a code point greater than
499        127 whose first byte was different to the first byte of the other case of
500        the letter, the other case of this starting letter was not recognized
501        (#976).
503    12. If a pattern that was studied started with a repeated Unicode property
504        test, for example, \p{Nd}+, there was the theoretical possibility of
505        setting up an incorrect bitmap of starting bytes, but fortunately it could
506        not have actually happened in practice until change 8 above was made (it
507        added property types that matched character-matching opcodes).
509    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
510        possible starting bytes for non-anchored patterns.
512    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
513        \R, and also a number of cases that involve Unicode properties, both
514        explicit and implicit when PCRE_UCP is set.
516    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
517        input, it could crash or give wrong results if characters with values
518        greater than 0xc0 were present in the subject string. (Detail: it assumed
519        UTF-8 input when processing these items.)
521    16. Added a lot of (int) casts to avoid compiler warnings in systems where
522        size_t is 64-bit (#991).
524    17. Added a check for running out of memory when PCRE is compiled with
525        --disable-stack-for-recursion (#990).
527    18. If the last data line in a file for pcretest does not have a newline on
528        the end, a newline was missing in the output.
530    19. The default pcre_chartables.c file recognizes only ASCII characters (values
531        less than 128) in its various bitmaps. However, there is a facility for
532        generating tables according to the current locale when PCRE is compiled. It
533        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
534        characters, are recognized by isspace() and therefore were getting set in
535        these tables, and indeed these tables seem to approximate to ISO 8859. This
536        caused a problem in UTF-8 mode when pcre_study() was used to create a list
537        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
538        which of course cannot start UTF-8 characters. I have changed the code so
539        that only real ASCII characters (less than 128) and the correct starting
540        bytes for UTF-8 encodings are set for characters greater than 127 when in
541        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
542        altogether.)
544    20. Added the /T option to pcretest so as to be able to run tests with non-
545        standard character tables, thus making it possible to include the tests
546        used for 19 above in the standard set of tests.
548    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
549        reference to a subpattern the other side of a comment that contains an
550        opening parenthesis caused either an internal compiling error, or a
551        reference to the wrong subpattern.
554    Version 8.02 19-Mar-2010
555  ------------------------  ------------------------
557  1.  The Unicode data tables have been updated to Unicode 5.2.0.  1.  The Unicode data tables have been updated to Unicode 5.2.0.
559    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
560        configured.
562    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
563        original author of that file, following a query about its status.
565    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
566        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
568    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
569        quantifier applied to a forward-referencing subroutine call, could compile
570        incorrect code or give the error "internal error: previously-checked
571        referenced subpattern not found".
573    6.  Both MS Visual Studio and Symbian OS have problems with initializing
574        variables to point to external functions. For these systems, therefore,
575        pcre_malloc etc. are now initialized to local functions that call the
576        relevant global functions.
578    7.  There were two entries missing in the vectors called coptable and poptable
579        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
580        I've fixed the data, and added a kludgy way of testing at compile time that
581        the lengths are correct (equal to the number of opcodes).
583    8.  Following on from 7, I added a similar kludge to check the length of the
584        eint vector in pcreposix.c.
586    9.  Error texts for pcre_compile() are held as one long string to avoid too
587        much relocation at load time. To find a text, the string is searched,
588        counting zeros. There was no check for running off the end of the string,
589        which could happen if a new error number was added without updating the
590        string.
592    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
594    11. \K was not working if it appeared in an atomic group or in a group that
595        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
596        \K is "not well defined" if used in an assertion. PCRE now accepts it if
597        the assertion is positive, but not if it is negative.
599    12. Change 11 fortuitously reduced the size of the stack frame used in the
600        "match()" function of pcre_exec.c by one pointer. Forthcoming
601        implementation of support for (*MARK) will need an extra pointer on the
602        stack; I have reserved it now, so that the stack frame size does not
603        decrease.
605    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
606        item in branch that calls a recursion is a subroutine call - as in the
607        second branch in the above example - was incorrectly given the compile-
608        time error "recursive call could loop indefinitely" because pcre_compile()
609        was not correctly checking the subroutine for matching a non-empty string.
611    14. The checks for overrunning compiling workspace could trigger after an
612        overrun had occurred. This is a "should never occur" error, but it can be
613        triggered by pathological patterns such as hundreds of nested parentheses.
614        The checks now trigger 100 bytes before the end of the workspace.
616    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
619  Version 8.01 19-Jan-2010  Version 8.01 19-Jan-2010
620  ------------------------  ------------------------

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