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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.0 02 Jul-08  Version 8.20
5    ------------
6    
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.
11    
12    2. If a pattern such as /(a)b|ac/ is matched against "ac", there is no captured
13       substring, but while checking the failing first alternative, substring 1 is
14       temporarily captured. If the output vector supplied to pcre_exec() was not
15       big enough for this capture, the yield of the function was still zero
16       ("insufficient space for captured substrings"). This cannot be totally fixed
17       without adding another stack variable, which seems a lot of expense for a
18       edge case. However, I have improved the situation in cases such as
19       /(a)(b)x|abc/ matched against "abc", where the return code indicates that
20       fewer than the maximum number of slots in the ovector have been set.
21    
22    3. Related to (2) above: when there are more back references in a pattern than
23       slots in the output vector, pcre_exec() uses temporary memory during
24       matching, and copies in the captures as far as possible afterwards. It was
25       using the entire output vector, but this conflicts with the specification
26       that only 2/3 is used for passing back captured substrings. Now it uses only
27       the first 2/3, for compatibility. This is, of course, another edge case.
28    
29    
30    Version 8.13 16-Aug-2011
31    ------------------------
32    
33    1.  The Unicode data tables have been updated to Unicode 6.0.0.
34    
35    2.  Two minor typos in pcre_internal.h have been fixed.
36    
37    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
38        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
39        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
40    
41    4.  There were a number of related bugs in the code for matching backrefences
42        caselessly in UTF-8 mode when codes for the characters concerned were
43        different numbers of bytes. For example, U+023A and U+2C65 are an upper
44        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
45        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
46        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
47        2-byte code at the end of the subject (it thought there wasn't enough data
48        left).
49    
50    5.  Comprehensive information about what went wrong is now returned by
51        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
52        as the output vector has at least 2 elements. The offset of the start of
53        the failing character and a reason code are placed in the vector.
54    
55    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
56        now returned is for the first byte of the failing character, instead of the
57        last byte inspected. This is an incompatible change, but I hope it is small
58        enough not to be a problem. It makes the returned offset consistent with
59        pcre_exec() and pcre_dfa_exec().
60    
61    7.  pcretest now gives a text phrase as well as the error number when
62        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
63        failure, the offset and reason code are output.
64    
65    8.  When \R was used with a maximizing quantifier it failed to skip backwards
66        over a \r\n pair if the subsequent match failed. Instead, it just skipped
67        back over a single character (\n). This seems wrong (because it treated the
68        two characters as a single entity when going forwards), conflicts with the
69        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
70        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
71        has been changed.
72    
73    9.  Some internal refactoring has changed the processing so that the handling
74        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
75        time (the PCRE_DOTALL option was changed this way some time ago: version
76        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
77        which was always a bit of a fudge. It also means that there is one less
78        argument for the match() function, which reduces its stack requirements
79        slightly. This change also fixes an incompatibility with Perl: the pattern
80        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
81    
82    10. More internal refactoring has drastically reduced the number of recursive
83        calls to match() for possessively repeated groups such as (abc)++ when
84        using pcre_exec().
85    
86    11. While implementing 10, a number of bugs in the handling of groups were
87        discovered and fixed:
88    
89        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
90        (a|)*(?1) gave a compile-time internal error.
91        ((a|)+)+  did not notice that the outer group could match an empty string.
92        (^a|^)+   was not marked as anchored.
93        (.*a|.*)+ was not marked as matching at start or after a newline.
94    
95    12. Yet more internal refactoring has removed another argument from the match()
96        function. Special calls to this function are now indicated by setting a
97        value in a variable in the "match data" data block.
98    
99    13. Be more explicit in pcre_study() instead of relying on "default" for
100        opcodes that mean there is no starting character; this means that when new
101        ones are added and accidentally left out of pcre_study(), testing should
102        pick them up.
103    
104    14. The -s option of pcretest has been documented for ages as being an old
105        synonym of -m (show memory usage). I have changed it to mean "force study
106        for every regex", that is, assume /S for every regex. This is similar to -i
107        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
108        using it. It makes it easier to run collections of tests with and without
109        study enabled, and thereby test pcre_study() more easily. All the standard
110        tests are now run with and without -s (but some patterns can be marked as
111        "never study" - see 20 below).
112    
113    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
114        restoration of the capturing data to the outer values was not happening
115        correctly.
116    
117    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
118        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
119        pattern had matched an empty string, and so incorrectly returned a no
120        match.
121    
122    17. There was optimizing code for the last branch of non-capturing parentheses,
123        and also for the obeyed branch of a conditional subexpression, which used
124        tail recursion to cut down on stack usage. Unfortunately, now that there is
125        the possibility of (*THEN) occurring in these branches, tail recursion is
126        no longer possible because the return has to be checked for (*THEN). These
127        two optimizations have therefore been removed.
128    
129    18. If a pattern containing \R was studied, it was assumed that \R always
130        matched two bytes, thus causing the minimum subject length to be
131        incorrectly computed because \R can also match just one byte.
132    
133    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
134        was incorrectly computed.
135    
136    20. If /S is present twice on a test pattern in pcretest input, it now
137        *disables* studying, thereby overriding the use of -s on the command line
138        (see 14 above). This is necessary for one or two tests to keep the output
139        identical in both cases.
140    
141    21. When (*ACCEPT) was used in an assertion that matched an empty string and
142        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
143    
144    22. When an atomic group that contained a capturing parenthesis was
145        successfully matched, but the branch in which it appeared failed, the
146        capturing was not being forgotten if a higher numbered group was later
147        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
148        group 1 to "a", when in fact it should be unset. This applied to multi-
149        branched capturing and non-capturing groups, repeated or not, and also to
150        positive assertions (capturing in negative assertions does not happen
151        in PCRE) and also to nested atomic groups.
152    
153    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
154        subject after a captured substring, to make it easier to tell which of a
155        number of identical substrings has been captured.
156    
157    24. The way atomic groups are processed by pcre_exec() has been changed so that
158        if they are repeated, backtracking one repetition now resets captured
159        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
160        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
161        "aaa". Previously, it would have been "a". As part of this code
162        refactoring, the way recursive calls are handled has also been changed.
163    
164    25. If an assertion condition captured any substrings, they were not passed
165        back unless some other capturing happened later. For example, if
166        (?(?=(a))a) was matched against "a", no capturing was returned.
167    
168    26. When studying a pattern that contained subroutine calls or assertions,
169        the code for finding the minimum length of a possible match was handling
170        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
171        group 1 called group 2 while simultaneously a separate group 2 called group
172        1). A stack overflow occurred in this case. I have fixed this by limiting
173        the recursion depth to 10.
174    
175    27. Updated RunTest.bat in the distribution to the version supplied by Tom
176        Fortmann. This supports explicit test numbers on the command line, and has
177        argument validation and error reporting.
178    
179    28. An instance of \X with an unlimited repeat could fail if at any point the
180        first character it looked at was a mark character.
181    
182    29. Some minor code refactoring concerning Unicode properties and scripts
183        should reduce the stack requirement of match() slightly.
184    
185    30. Added the '=' option to pcretest to check the setting of unused capturing
186        slots at the end of the pattern, which are documented as being -1, but are
187        not included in the return count.
188    
189    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
190        compiled something random. Now it gives a compile-time error (as does
191        Perl).
192    
193    32. A *MARK encountered during the processing of a positive assertion is now
194        recorded and passed back (compatible with Perl).
195    
196    33. If --only-matching or --colour was set on a pcregrep call whose pattern
197        had alternative anchored branches, the search for a second match in a line
198        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
199        matched the line "0102" twice. The same bug affected patterns that started
200        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
201        twice.
202    
203    34. Previously, PCRE did not allow quantification of assertions. However, Perl
204        does, and because of capturing effects, quantifying parenthesized
205        assertions may at times be useful. Quantifiers are now allowed for
206        parenthesized assertions.
207    
208    35. A minor code tidy in pcre_compile() when checking options for \R usage.
209    
210    36. \g was being checked for fancy things in a character class, when it should
211        just be a literal "g".
212    
213    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
214        appearance of a nested POSIX class supersedes an apparent external class.
215        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
216        unescaped square brackets may also appear as part of class names. For
217        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
218        more like Perl. (But see 8.20/1 above.)
219    
220    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
221        was because it thought it was \N{name}, which is not supported).
222    
223    39. Add minix to OS list not supporting the -S option in pcretest.
224    
225    40. PCRE tries to detect cases of infinite recursion at compile time, but it
226        cannot analyze patterns in sufficient detail to catch mutual recursions
227        such as ((?1))((?2)). There is now a runtime test that gives an error if a
228        subgroup is called recursively as a subpattern for a second time at the
229        same position in the subject string. In previous releases this might have
230        been caught by the recursion limit, or it might have run out of stack.
231    
232    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
233        happen only once. PCRE was, however incorrectly giving a compile time error
234        "recursive call could loop indefinitely" because it cannot analyze the
235        pattern in sufficient detail. The compile time test no longer happens when
236        PCRE is compiling a conditional subpattern, but actual runaway loops are
237        now caught at runtime (see 40 above).
238    
239    42. It seems that Perl allows any characters other than a closing parenthesis
240        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
241        has been changed to be the same.
242    
243    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
244        as not to get warnings when autogen.sh is called. Also changed
245        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
246    
247    44. To help people who use pcregrep to scan files containing exceedingly long
248        lines, the following changes have been made:
249    
250        (a) The default value of the buffer size parameter has been increased from
251            8K to 20K. (The actual buffer used is three times this size.)
252    
253        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
254            PCRE is built.
255    
256        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
257            to be set at run time.
258    
259        (d) Numerical values in pcregrep options can be followed by K or M, for
260            example --buffer-size=50K.
261    
262        (e) If a line being scanned overflows pcregrep's buffer, an error is now
263            given and the return code is set to 2.
264    
265    45. Add a pointer to the latest mark to the callout data block.
266    
267    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
268        partial match of an empty string instead of no match. This was specific to
269        the use of ".".
270    
271    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
272        complete match instead of a partial match. This bug was dependent on both
273        the PCRE_UTF8 and PCRE_DOTALL options being set.
274    
275    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
276        starting byte set, because \b was not being ignored.
277    
278    
279    Version 8.12 15-Jan-2011
280    ------------------------
281    
282    1.  Fixed some typos in the markup of the man pages, and wrote a script that
283        checks for such things as part of the documentation building process.
284    
285    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
286        --match-limit and --recursion-limit options (added for 8.11). In
287        particular, this made one of the standard tests fail. (The integer value
288        went into the wrong half of a long int.)
289    
290    3.  If the --colour option was given to pcregrep with -v (invert match), it
291        did strange things, either producing crazy output, or crashing. It should,
292        of course, ignore a request for colour when reporting lines that do not
293        match.
294    
295    4.  Another pcregrep bug caused similar problems if --colour was specified with
296        -M (multiline) and the pattern match finished with a line ending.
297    
298    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
299        matched in multiline mode, the following line was shown as part of the
300        match. This seems wrong, so I have changed it.
301    
302    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
303        the check for further matches in the same line (so they could be coloured)
304        to overrun the end of the current line. If another match was found, it was
305        incorrectly shown (and then shown again when found in the next line).
306    
307    7.  If pcregrep was compiled under Windows, there was a reference to the
308        function pcregrep_exit() before it was defined. I am assuming this was
309        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
310        reported by a user. I've moved the definition above the reference.
311    
312    
313    Version 8.11 10-Dec-2010
314    ------------------------
315    
316    1.  (*THEN) was not working properly if there were untried alternatives prior
317        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
318        backtracked to try for "b" instead of moving to the next alternative branch
319        at the same level (in this case, to look for "c"). The Perl documentation
320        is clear that when (*THEN) is backtracked onto, it goes to the "next
321        alternative in the innermost enclosing group".
322    
323    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
324        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
325        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
326        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
327        (*THEN).
328    
329    3.  If \s appeared in a character class, it removed the VT character from
330        the class, even if it had been included by some previous item, for example
331        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
332        of \s, but is part of the POSIX "space" class.)
333    
334    4.  A partial match never returns an empty string (because you can always
335        match an empty string at the end of the subject); however the checking for
336        an empty string was starting at the "start of match" point. This has been
337        changed to the "earliest inspected character" point, because the returned
338        data for a partial match starts at this character. This means that, for
339        example, /(?<=abc)def/ gives a partial match for the subject "abc"
340        (previously it gave "no match").
341    
342    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
343        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
344        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
345        has an implication that the given string is incomplete (because a partial
346        match is preferred over a full match). For this reason, these items now
347        give a partial match in this situation. [Aside: previously, the one case
348        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
349        match rather than a full match, which was wrong by the old rules, but is
350        now correct.]
351    
352    6.  There was a bug in the handling of #-introduced comments, recognized when
353        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
354        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
355        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
356        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
357        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
358        places in pcre_compile().
359    
360    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
361        comments when looking ahead for named forward references to subpatterns,
362        the only newline sequence it recognized was NL. It now handles newlines
363        according to the set newline convention.
364    
365    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
366        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
367        cater for a lack of strerror(). These oversights have been fixed.
368    
369    9.  Added --match-limit and --recursion-limit to pcregrep.
370    
371    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
372    
373    11. When the -o option was used, pcregrep was setting a return code of 1, even
374        when matches were found, and --line-buffered was not being honoured.
375    
376    12. Added an optional parentheses number to the -o and --only-matching options
377        of pcregrep.
378    
379    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
380        can match an empty string. The code to do it in pcretest and pcredemo
381        needed fixing:
382    
383        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
384            only one byte after an empty string match just before CRLF (this case
385            just got forgotten; "any" and "anycrlf" were OK).
386    
387        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
388            mode when an empty string match preceded an ASCII character followed by
389            a non-ASCII character. (The code for advancing by one character rather
390            than one byte was nonsense.)
391    
392        (c) The pcredemo.c sample program did not have any code at all to handle
393            the cases when CRLF is a valid newline sequence.
394    
395    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
396        as a starting offset was within the subject string. There is now a new
397        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
398        negative or greater than the length of the string. In order to test this,
399        pcretest is extended to allow the setting of negative starting offsets.
400    
401    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
402        starting offset points to the beginning of a UTF-8 character was
403        unnecessarily clumsy. I tidied it up.
404    
405    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
406        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
407    
408    17. Nobody had reported that the --include_dir option, which was added in
409        release 7.7 should have been called --include-dir (hyphen, not underscore)
410        for compatibility with GNU grep. I have changed it to --include-dir, but
411        left --include_dir as an undocumented synonym, and the same for
412        --exclude-dir, though that is not available in GNU grep, at least as of
413        release 2.5.4.
414    
415    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
416        characters from a string of bytes) have been redefined so as not to use
417        loops, in order to improve performance in some environments. At the same
418        time, I abstracted some of the common code into auxiliary macros to save
419        repetition (this should not affect the compiled code).
420    
421    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
422        compile-time error is now given if \c is not followed by an ASCII
423        character, that is, a byte less than 128. (In EBCDIC mode, the code is
424        different, and any byte value is allowed.)
425    
426    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
427        START_OPTIMIZE option, which is now allowed at compile time - but just
428        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
429        to pcregrep and other applications that have no direct access to PCRE
430        options. The new /Y option in pcretest sets this option when calling
431        pcre_compile().
432    
433    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
434        back references. Groups containing recursive back references were forced to
435        be atomic by that change, but in the case of named groups, the amount of
436        memory required was incorrectly computed, leading to "Failed: internal
437        error: code overflow". This has been fixed.
438    
439    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
440        pcretest.c, to avoid build problems in some Borland environments.
441    
442    
443    Version 8.10 25-Jun-2010
444    ------------------------
445    
446    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
447        THEN.
448    
449    2.  (*ACCEPT) was not working when inside an atomic group.
450    
451    3.  Inside a character class, \B is treated as a literal by default, but
452        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
453        causes the error). The code is unchanged, but I tidied the documentation.
454    
455    4.  Inside a character class, PCRE always treated \R and \X as literals,
456        whereas Perl faults them if its -w option is set. I have changed PCRE so
457        that it faults them when PCRE_EXTRA is set.
458    
459    5.  Added support for \N, which always matches any character other than
460        newline. (It is the same as "." when PCRE_DOTALL is not set.)
461    
462    6.  When compiling pcregrep with newer versions of gcc which may have
463        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
464        declared with attribute warn_unused_result" were given. Just casting the
465        result to (void) does not stop the warnings; a more elaborate fudge is
466        needed. I've used a macro to implement this.
467    
468    7.  Minor change to pcretest.c to avoid a compiler warning.
469    
470    8.  Added four artifical Unicode properties to help with an option to make
471        \s etc use properties (see next item). The new properties are: Xan
472        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
473    
474    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
475        use Unicode properties. (*UCP) at the start of a pattern can be used to set
476        this option. Modified pcretest to add /W to test this facility. Added
477        REG_UCP to make it available via the POSIX interface.
478    
479    10. Added --line-buffered to pcregrep.
480    
481    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
482        studied, and the match started with a letter with a code point greater than
483        127 whose first byte was different to the first byte of the other case of
484        the letter, the other case of this starting letter was not recognized
485        (#976).
486    
487    12. If a pattern that was studied started with a repeated Unicode property
488        test, for example, \p{Nd}+, there was the theoretical possibility of
489        setting up an incorrect bitmap of starting bytes, but fortunately it could
490        not have actually happened in practice until change 8 above was made (it
491        added property types that matched character-matching opcodes).
492    
493    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
494        possible starting bytes for non-anchored patterns.
495    
496    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
497        \R, and also a number of cases that involve Unicode properties, both
498        explicit and implicit when PCRE_UCP is set.
499    
500    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
501        input, it could crash or give wrong results if characters with values
502        greater than 0xc0 were present in the subject string. (Detail: it assumed
503        UTF-8 input when processing these items.)
504    
505    16. Added a lot of (int) casts to avoid compiler warnings in systems where
506        size_t is 64-bit (#991).
507    
508    17. Added a check for running out of memory when PCRE is compiled with
509        --disable-stack-for-recursion (#990).
510    
511    18. If the last data line in a file for pcretest does not have a newline on
512        the end, a newline was missing in the output.
513    
514    19. The default pcre_chartables.c file recognizes only ASCII characters (values
515        less than 128) in its various bitmaps. However, there is a facility for
516        generating tables according to the current locale when PCRE is compiled. It
517        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
518        characters, are recognized by isspace() and therefore were getting set in
519        these tables, and indeed these tables seem to approximate to ISO 8859. This
520        caused a problem in UTF-8 mode when pcre_study() was used to create a list
521        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
522        which of course cannot start UTF-8 characters. I have changed the code so
523        that only real ASCII characters (less than 128) and the correct starting
524        bytes for UTF-8 encodings are set for characters greater than 127 when in
525        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
526        altogether.)
527    
528    20. Added the /T option to pcretest so as to be able to run tests with non-
529        standard character tables, thus making it possible to include the tests
530        used for 19 above in the standard set of tests.
531    
532    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
533        reference to a subpattern the other side of a comment that contains an
534        opening parenthesis caused either an internal compiling error, or a
535        reference to the wrong subpattern.
536    
537    
538    Version 8.02 19-Mar-2010
539    ------------------------
540    
541    1.  The Unicode data tables have been updated to Unicode 5.2.0.
542    
543    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
544        configured.
545    
546    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
547        original author of that file, following a query about its status.
548    
549    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
550        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
551    
552    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
553        quantifier applied to a forward-referencing subroutine call, could compile
554        incorrect code or give the error "internal error: previously-checked
555        referenced subpattern not found".
556    
557    6.  Both MS Visual Studio and Symbian OS have problems with initializing
558        variables to point to external functions. For these systems, therefore,
559        pcre_malloc etc. are now initialized to local functions that call the
560        relevant global functions.
561    
562    7.  There were two entries missing in the vectors called coptable and poptable
563        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
564        I've fixed the data, and added a kludgy way of testing at compile time that
565        the lengths are correct (equal to the number of opcodes).
566    
567    8.  Following on from 7, I added a similar kludge to check the length of the
568        eint vector in pcreposix.c.
569    
570    9.  Error texts for pcre_compile() are held as one long string to avoid too
571        much relocation at load time. To find a text, the string is searched,
572        counting zeros. There was no check for running off the end of the string,
573        which could happen if a new error number was added without updating the
574        string.
575    
576    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
577    
578    11. \K was not working if it appeared in an atomic group or in a group that
579        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
580        \K is "not well defined" if used in an assertion. PCRE now accepts it if
581        the assertion is positive, but not if it is negative.
582    
583    12. Change 11 fortuitously reduced the size of the stack frame used in the
584        "match()" function of pcre_exec.c by one pointer. Forthcoming
585        implementation of support for (*MARK) will need an extra pointer on the
586        stack; I have reserved it now, so that the stack frame size does not
587        decrease.
588    
589    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
590        item in branch that calls a recursion is a subroutine call - as in the
591        second branch in the above example - was incorrectly given the compile-
592        time error "recursive call could loop indefinitely" because pcre_compile()
593        was not correctly checking the subroutine for matching a non-empty string.
594    
595    14. The checks for overrunning compiling workspace could trigger after an
596        overrun had occurred. This is a "should never occur" error, but it can be
597        triggered by pathological patterns such as hundreds of nested parentheses.
598        The checks now trigger 100 bytes before the end of the workspace.
599    
600    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
601    
602    
603    Version 8.01 19-Jan-2010
604    ------------------------
605    
606    1.  If a pattern contained a conditional subpattern with only one branch (in
607        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
608        computed the wrong minimum data length (which is of course zero for such
609        subpatterns). This could cause incorrect "no match" results.
610    
611    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
612        the pattern is reset in the first branch, pcre_compile() failed with
613        "internal error: code overflow at offset...". This happened only when
614        the reset was to the original external option setting. (An optimization
615        abstracts leading options settings into an external setting, which was the
616        cause of this.)
617    
618    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
619        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
620        assertion pattern did not match (meaning that the assertion was true), it
621        was incorrectly treated as false if the SKIP had been reached during the
622        matching. This also applied to assertions used as conditions.
623    
624    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
625        assertion subpattern, including such a pattern used as a condition,
626        unpredictable results occurred, instead of the error return
627        PCRE_ERROR_DFA_UITEM.
628    
629    5.  The C++ GlobalReplace function was not working like Perl for the special
630        situation when an empty string is matched. It now does the fancy magic
631        stuff that is necessary.
632    
633    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
634        removed. (These were left over from very, very early versions of PCRE.)
635    
636    7.  Some cosmetic changes to the code to make life easier when compiling it
637        as part of something else:
638    
639        (a) Change DEBUG to PCRE_DEBUG.
640    
641        (b) In pcre_compile(), rename the member of the "branch_chain" structure
642            called "current" as "current_branch", to prevent a collision with the
643            Linux macro when compiled as a kernel module.
644    
645        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
646            prevent a collision with the Linux macro when compiled as a kernel
647            module.
648    
649    8.  In pcre_compile() there are some checks for integer overflows that used to
650        cast potentially large values to (double). This has been changed to that
651        when building, a check for int64_t is made, and if it is found, it is used
652        instead, thus avoiding the use of floating point arithmetic. (There is no
653        other use of FP in PCRE.) If int64_t is not found, the fallback is to
654        double.
655    
656    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
657        2005 (difference between two addresses compared to an unsigned value).
658    
659    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
660        custom one, because of the following reported problem in Windows:
661    
662          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
663              under Win32.
664          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
665              therefore missing the function definition.
666          - The compiler thus generates a "C" signature for the test function.
667          - The linker fails to find the "C" function.
668          - PCRE fails to configure if asked to do so against libbz2.
669    
670    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
671        messages were output:
672    
673          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
674          rerunning libtoolize, to keep the correct libtool macros in-tree.
675          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
676    
677        I have done both of these things.
678    
679    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
680        most of the time, it *can* run out if it is given a pattern that contains a
681        runaway infinite recursion. I updated the discussion in the pcrestack man
682        page.
683    
684    13. Now that we have gone to the x.xx style of version numbers, the minor
685        version may start with zero. Using 08 or 09 is a bad idea because users
686        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
687        interpreted as invalid octal numbers. I've updated the previous comment in
688        configure.ac, and also added a check that gives an error if 08 or 09 are
689        used.
690    
691    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
692        causing partial matching to fail when the end of the subject matched \W
693        in a UTF-8 pattern where \W was quantified with a minimum of 3.
694    
695    15. There were some discrepancies between the declarations in pcre_internal.h
696        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
697        their definitions. The declarations used "const uschar *" and the
698        definitions used USPTR. Even though USPTR is normally defined as "const
699        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
700        reported that: "This difference in casting confuses some C++ compilers, for
701        example, SunCC recognizes above declarations as different functions and
702        generates broken code for hbpcre." I have changed the declarations to use
703        USPTR.
704    
705    16. GNU libtool is named differently on some systems. The autogen.sh script now
706        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
707        (FreeBSD).
708    
709    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
710        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
711        comment: "Figure out how to create a longlong from a string: strtoll and
712        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
713        instance, but it only takes 2 args instead of 3!"
714    
715    18. A subtle bug concerned with back references has been fixed by a change of
716        specification, with a corresponding code fix. A pattern such as
717        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
718        refers, was giving matches when it shouldn't. For example, xa=xaaa would
719        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
720        same bug. Such groups have to be quantified to be useful, or contained
721        inside another quantified group. (If there's no repetition, the reference
722        can never match.) The problem arises because, having left the group and
723        moved on to the rest of the pattern, a later failure that backtracks into
724        the group uses the captured value from the final iteration of the group
725        rather than the correct earlier one. I have fixed this in PCRE by forcing
726        any group that contains a reference to itself to be an atomic group; that
727        is, there cannot be any backtracking into it once it has completed. This is
728        similar to recursive and subroutine calls.
729    
730    
731    Version 8.00 19-Oct-09
732    ----------------------
733    
734    1.  The table for translating pcre_compile() error codes into POSIX error codes
735        was out-of-date, and there was no check on the pcre_compile() error code
736        being within the table. This could lead to an OK return being given in
737        error.
738    
739    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
740        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
741        in a Windows environment.
742    
743    3.  The pcregrep --count option prints the count for each file even when it is
744        zero, as does GNU grep. However, pcregrep was also printing all files when
745        --files-with-matches was added. Now, when both options are given, it prints
746        counts only for those files that have at least one match. (GNU grep just
747        prints the file name in this circumstance, but including the count seems
748        more useful - otherwise, why use --count?) Also ensured that the
749        combination -clh just lists non-zero counts, with no names.
750    
751    4.  The long form of the pcregrep -F option was incorrectly implemented as
752        --fixed_strings instead of --fixed-strings. This is an incompatible change,
753        but it seems right to fix it, and I didn't think it was worth preserving
754        the old behaviour.
755    
756    5.  The command line items --regex=pattern and --regexp=pattern were not
757        recognized by pcregrep, which required --regex pattern or --regexp pattern
758        (with a space rather than an '='). The man page documented the '=' forms,
759        which are compatible with GNU grep; these now work.
760    
761    6.  No libpcreposix.pc file was created for pkg-config; there was just
762        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
763    
764    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
765        when UCP support is not needed, by modifying the Python script that
766        generates it from Unicode data files. This should not matter if the module
767        is correctly used as a library, but I received one complaint about 50K of
768        unwanted data. My guess is that the person linked everything into his
769        program rather than using a library. Anyway, it does no harm.
770    
771    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
772        was a minimum greater than 1 for a wide character in a possessive
773        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
774        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
775        character. Chaos in the form of incorrect output or a compiling loop could
776        result.
777    
778    9.  The restrictions on what a pattern can contain when partial matching is
779        requested for pcre_exec() have been removed. All patterns can now be
780        partially matched by this function. In addition, if there are at least two
781        slots in the offset vector, the offset of the earliest inspected character
782        for the match and the offset of the end of the subject are set in them when
783        PCRE_ERROR_PARTIAL is returned.
784    
785    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
786        synonymous with PCRE_PARTIAL, for backwards compatibility, and
787        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
788        and may be more useful for multi-segment matching.
789    
790    11. Partial matching with pcre_exec() is now more intuitive. A partial match
791        used to be given if ever the end of the subject was reached; now it is
792        given only if matching could not proceed because another character was
793        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
794        string "Z", which now yields "no match" instead of "partial match". In the
795        case of pcre_dfa_exec(), "no match" is given if every matching path for the
796        final character ended with (*FAIL).
797    
798    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
799        if the pattern had a "must contain" character that was already found in the
800        earlier partial match, unless partial matching was again requested. For
801        example, with the pattern /dog.(body)?/, the "must contain" character is
802        "g". If the first part-match was for the string "dog", restarting with
803        "sbody" failed. This bug has been fixed.
804    
805    13. The string returned by pcre_dfa_exec() after a partial match has been
806        changed so that it starts at the first inspected character rather than the
807        first character of the match. This makes a difference only if the pattern
808        starts with a lookbehind assertion or \b or \B (\K is not supported by
809        pcre_dfa_exec()). It's an incompatible change, but it makes the two
810        matching functions compatible, and I think it's the right thing to do.
811    
812    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
813        so that the demonstration program is easily available in environments where
814        PCRE has not been installed from source.
815    
816    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
817        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
818        library.
819    
820    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
821        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
822        is not the first non-POSIX option to be added. Clearly some people find
823        these options useful.
824    
825    17. If a caller to the POSIX matching function regexec() passes a non-zero
826        value for nmatch with a NULL value for pmatch, the value of
827        nmatch is forced to zero.
828    
829    18. RunGrepTest did not have a test for the availability of the -u option of
830        the diff command, as RunTest does. It now checks in the same way as
831        RunTest, and also checks for the -b option.
832    
833    19. If an odd number of negated classes containing just a single character
834        interposed, within parentheses, between a forward reference to a named
835        subpattern and the definition of the subpattern, compilation crashed with
836        an internal error, complaining that it could not find the referenced
837        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
838        [The bug was that it was starting one character too far in when skipping
839        over the character class, thus treating the ] as data rather than
840        terminating the class. This meant it could skip too much.]
841    
842    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
843        /g option in pcretest when the pattern contains \K, which makes it possible
844        to have an empty string match not at the start, even when the pattern is
845        anchored. Updated pcretest and pcredemo to use this option.
846    
847    21. If the maximum number of capturing subpatterns in a recursion was greater
848        than the maximum at the outer level, the higher number was returned, but
849        with unset values at the outer level. The correct (outer level) value is
850        now given.
851    
852    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
853        PCRE did not set those parentheses (unlike Perl). I have now found a way to
854        make it do so. The string so far is captured, making this feature
855        compatible with Perl.
856    
857    23. The tests have been re-organized, adding tests 11 and 12, to make it
858        possible to check the Perl 5.10 features against Perl 5.10.
859    
860    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
861        pattern matches a fixed length string. PCRE did not allow this; now it
862        does. Neither allows recursion.
863    
864    25. I finally figured out how to implement a request to provide the minimum
865        length of subject string that was needed in order to match a given pattern.
866        (It was back references and recursion that I had previously got hung up
867        on.) This code has now been added to pcre_study(); it finds a lower bound
868        to the length of subject needed. It is not necessarily the greatest lower
869        bound, but using it to avoid searching strings that are too short does give
870        some useful speed-ups. The value is available to calling programs via
871        pcre_fullinfo().
872    
873    26. While implementing 25, I discovered to my embarrassment that pcretest had
874        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
875        study optimizations had never been tested with that matching function.
876        Oops. What is worse, even when it was passed study data, there was a bug in
877        pcre_dfa_exec() that meant it never actually used it. Double oops. There
878        were also very few tests of studied patterns with pcre_dfa_exec().
879    
880    27. If (?| is used to create subpatterns with duplicate numbers, they are now
881        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
882        on the other side of the coin, they are no longer allowed to have different
883        names, because these cannot be distinguished in PCRE, and this has caused
884        confusion. (This is a difference from Perl.)
885    
886    28. When duplicate subpattern names are present (necessarily with different
887        numbers, as required by 27 above), and a test is made by name in a
888        conditional pattern, either for a subpattern having been matched, or for
889        recursion in such a pattern, all the associated numbered subpatterns are
890        tested, and the overall condition is true if the condition is true for any
891        one of them. This is the way Perl works, and is also more like the way
892        testing by number works.
893    
894    
895    Version 7.9 11-Apr-09
896    ---------------------
897    
898    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
899        (pcretest), all targets were linked against these libraries. This included
900        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
901        libraries. This caused unwanted dependencies to be created. This problem
902        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
903        pcretest is linked with readline.
904    
905    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
906        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
907        moved outside it again, because FALSE and TRUE are already defined in AIX,
908        but BOOL is not.
909    
910    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
911        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
912    
913    4.  The pcregrep documentation said spaces were inserted as well as colons (or
914        hyphens) following file names and line numbers when outputting matching
915        lines. This is not true; no spaces are inserted. I have also clarified the
916        wording for the --colour (or --color) option.
917    
918    5.  In pcregrep, when --colour was used with -o, the list of matching strings
919        was not coloured; this is different to GNU grep, so I have changed it to be
920        the same.
921    
922    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
923        each matching line was coloured. Now it goes on to look for further matches
924        of any of the test patterns, which is the same behaviour as GNU grep.
925    
926    7.  A pattern that could match an empty string could cause pcregrep to loop; it
927        doesn't make sense to accept an empty string match in pcregrep, so I have
928        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
929        seems to be how GNU grep behaves.
930    
931    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
932        start or after a newline", because the conditional assertion was not being
933        correctly handled. The rule now is that both the assertion and what follows
934        in the first alternative must satisfy the test.
935    
936    9.  If auto-callout was enabled in a pattern with a conditional group whose
937        condition was an assertion, PCRE could crash during matching, both with
938        pcre_exec() and pcre_dfa_exec().
939    
940    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
941        used for matching.
942    
943    11. Unicode property support in character classes was not working for
944        characters (bytes) greater than 127 when not in UTF-8 mode.
945    
946    12. Added the -M command line option to pcretest.
947    
948    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
949    
950    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
951    
952    16. Added comments and documentation about mis-use of no_arg in the C++
953        wrapper.
954    
955    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
956        from Martin Jerabek that uses macro names for all relevant character and
957        string constants.
958    
959    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
960        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
961        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
962        these, but not everybody uses configure.
963    
964    19. A conditional group that had only one branch was not being correctly
965        recognized as an item that could match an empty string. This meant that an
966        enclosing group might also not be so recognized, causing infinite looping
967        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
968        with the subject "ab", where knowledge that the repeated group can match
969        nothing is needed in order to break the loop.
970    
971    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
972        exec(), but without supplying a callout function, matching went wrong.
973    
974    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
975        leak if the size of the offset vector was greater than 30. When the vector
976        is smaller, the saved offsets during recursion go onto a local stack
977        vector, but for larger vectors malloc() is used. It was failing to free
978        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
979        error, in fact).
980    
981    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
982        heapframe that is used only when UTF-8 support is enabled. This caused no
983        problem, but was untidy.
984    
985    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
986        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
987        included within another project.
988    
989    24. Steven Van Ingelgem's patches to add more options to the CMake support,
990        slightly modified by me:
991    
992          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
993              not building pcregrep.
994    
995          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
996              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
997    
998    25. Forward references, both numeric and by name, in patterns that made use of
999        duplicate group numbers, could behave incorrectly or give incorrect errors,
1000        because when scanning forward to find the reference group, PCRE was not
1001        taking into account the duplicate group numbers. A pattern such as
1002        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
1003    
1004    26. Changed a few more instances of "const unsigned char *" to USPTR, making
1005        the feature of a custom pointer more persuasive (as requested by a user).
1006    
1007    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
1008        pcretest.c, inside #ifndefs, because it seems they are sometimes already
1009        pre-defined.
1010    
1011    28. Added support for (*UTF8) at the start of a pattern.
1012    
1013    29. Arrange for flags added by the "release type" setting in CMake to be shown
1014        in the configuration summary.
1015    
1016    
1017    Version 7.8 05-Sep-08
1018  ---------------------  ---------------------
1019    
1020  1.  Replaced UCP searching code with optimized version as implemented for Ad  1.  Replaced UCP searching code with optimized version as implemented for Ad
# Line 13  Version 8.0 02 Jul-08 Line 1026  Version 8.0 02 Jul-08
1026    
1027  2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more  2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
1028      scripts.      scripts.
1029    
1030  3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained  3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
1031      a group with a zero qualifier. The result of the study could be incorrect,      a group with a zero qualifier. The result of the study could be incorrect,
1032      or the function might crash, depending on the pattern.      or the function might crash, depending on the pattern.
1033    
1034  4.  Caseless matching was not working for non-ASCII characters in back  4.  Caseless matching was not working for non-ASCII characters in back
1035      references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.      references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
1036      It now works when Unicode Property Support is available.      It now works when Unicode Property Support is available.
1037    
1038  5.  In pcretest, an escape such as \x{de} in the data was always generating  5.  In pcretest, an escape such as \x{de} in the data was always generating
1039      a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in      a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
1040      non-UTF-8 mode. If the value is greater than 255, it gives a warning about      non-UTF-8 mode. If the value is greater than 255, it gives a warning about
1041      truncation.      truncation.
1042    
1043    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
1044    
1045    7.  Added two (int) casts to pcregrep when printing the difference of two
1046        pointers, in case they are 64-bit values.
1047    
1048    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
1049        test 2 if it fails.
1050    
1051    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
1052        and a #define of that name to empty if it is not externally set. This is to
1053        allow users of MSVC to set it if necessary.
1054    
1055    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
1056        the convenience functions in the pcre_get.c source file.
1057    
1058    11. An option change at the start of a pattern that had top-level alternatives
1059        could cause overwriting and/or a crash. This command provoked a crash in
1060        some environments:
1061    
1062          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
1063    
1064        This potential security problem was recorded as CVE-2008-2371.
1065    
1066    12. For a pattern where the match had to start at the beginning or immediately
1067        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
1068        pcre_dfa_exec() could read past the end of the passed subject if there was
1069        no match. To help with detecting such bugs (e.g. with valgrind), I modified
1070        pcretest so that it places the subject at the end of its malloc-ed buffer.
1071    
1072    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
1073        exec() might read past the end of the data buffer in UTF-8 mode.
1074    
1075    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
1076        the data contained the byte 0x85 as part of a UTF-8 character within its
1077        first line. This applied both to normal and DFA matching.
1078    
1079    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
1080        /^[^d]*?$/8 failed to match "abc".
1081    
1082    16. Added a missing copyright notice to pcrecpp_internal.h.
1083    
1084    17. Make it more clear in the documentation that values returned from
1085        pcre_exec() in ovector are byte offsets, not character counts.
1086    
1087    18. Tidied a few places to stop certain compilers from issuing warnings.
1088    
1089    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
1090        supplied by Stefan Weber. I made a further small update for 7.8 because
1091        there is a change of source arrangements: the pcre_searchfuncs.c module is
1092        replaced by pcre_ucd.c.
1093    
1094    
1095  Version 7.7 07-May-08  Version 7.7 07-May-08

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