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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.4 10-Sep-07  Version 8.21
5    ------------
6    
7    1.  Updating the JIT compiler.
8    
9    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
10        are added as well.
11    
12    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
13        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
14        calling _pcre_jit_exec. Some extra comments are added.
15    
16    4.  Mark settings inside atomic groups that do not contain any capturing
17        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
18        was introduced by change 18 for 8.20.
19    
20    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
21        ECMA-262 standard.
22    
23    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
24        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
25        This bug was probably introduced by change 9 of 8.13.
26    
27    7.  While fixing 6 above, I noticed that a number of other items were being
28        incorrectly rejected as "not fixed length". This arose partly because newer
29        opcodes had not been added to the fixed-length checking code. I have (a)
30        corrected the bug and added tests for these items, and (b) arranged for an
31        error to occur if an unknown opcode is encountered while checking for fixed
32        length instead of just assuming "not fixed length". The items that were
33        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
34        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
35        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
36    
37    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
38        being incorrectly compiled and would have given unpredicatble results.
39    
40    9.  A possessively repeated subpattern with minimum repeat count greater than
41        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
42        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
43        the first (A) could occur when it should not.
44    
45    10. Add a cast and remove a redundant test from the code.
46    
47    11. JIT should use pcre_malloc/pcre_free for allocation.
48    
49    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
50        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
51        is anything other than /usr, -L is still shown).
52    
53    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
54    
55    
56    Version 8.20 21-Oct-2011
57    ------------------------
58    
59    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
60        a POSIX class. After further experiments with Perl, which convinced me that
61        Perl has bugs and confusions, a closing square bracket is no longer allowed
62        in a POSIX name. This bug also affected patterns with classes that started
63        with full stops.
64    
65    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
66        captured substring, but while checking the failing first alternative,
67        substring 1 is temporarily captured. If the output vector supplied to
68        pcre_exec() was not big enough for this capture, the yield of the function
69        was still zero ("insufficient space for captured substrings"). This cannot
70        be totally fixed without adding another stack variable, which seems a lot
71        of expense for a edge case. However, I have improved the situation in cases
72        such as /(a)(b)x|abc/ matched against "abc", where the return code
73        indicates that fewer than the maximum number of slots in the ovector have
74        been set.
75    
76    3.  Related to (2) above: when there are more back references in a pattern than
77        slots in the output vector, pcre_exec() uses temporary memory during
78        matching, and copies in the captures as far as possible afterwards. It was
79        using the entire output vector, but this conflicts with the specification
80        that only 2/3 is used for passing back captured substrings. Now it uses
81        only the first 2/3, for compatibility. This is, of course, another edge
82        case.
83    
84    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
85        main code base, and can be used by building with --enable-jit. When this is
86        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
87        runtime --no-jit option is given.
88    
89    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
90        ovector, the return from the function was zero, implying that there were
91        other matches that did not fit. The correct "exactly full" value is now
92        returned.
93    
94    6.  If a subpattern that was called recursively or as a subroutine contained
95        (*PRUNE) or any other control that caused it to give a non-standard return,
96        invalid errors such as "Error -26 (nested recursion at the same subject
97        position)" or even infinite loops could occur.
98    
99    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
100        computing the minimum length on reaching *ACCEPT, and so ended up with the
101        wrong value of 1 rather than 0. Further investigation indicates that
102        computing a minimum subject length in the presence of *ACCEPT is difficult
103        (think back references, subroutine calls), and so I have changed the code
104        so that no minimum is registered for a pattern that contains *ACCEPT.
105    
106    8.  If (*THEN) was present in the first (true) branch of a conditional group,
107        it was not handled as intended. [But see 16 below.]
108    
109    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
110        Sheri Pierce.
111    
112    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
113        the first byte in a match must be "a".
114    
115    11. Change 17 for 8.13 increased the recursion depth for patterns like
116        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
117        pattern contains any instances of (*THEN). If it does not, the old
118        optimizations are restored. It would be nice to do this on a per-group
119        basis, but at the moment that is not feasible.
120    
121    12. In some environments, the output of pcretest -C is CRLF terminated. This
122        broke RunTest's code that checks for the link size. A single white space
123        character after the value is now allowed for.
124    
125    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
126        For "fr", it uses the Windows-specific input and output files.
127    
128    14. If (*THEN) appeared in a group that was called recursively or as a
129        subroutine, it did not work as intended. [But see next item.]
130    
131    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
132        pattern fragments (but not containing any | characters). If A and B are
133        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
134        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
135        D. In other words, Perl considers parentheses that do not contain any |
136        characters to be part of a surrounding alternative, whereas PCRE was
137        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
138        differently. PCRE now behaves in the same way as Perl, except in the case
139        of subroutine/recursion calls such as (?1) which have in any case always
140        been different (but PCRE had them first :-).
141    
142    16. Related to 15 above: Perl does not treat the | in a conditional group as
143        creating alternatives. Such a group is treated in the same way as an
144        ordinary group without any | characters when processing (*THEN). PCRE has
145        been changed to match Perl's behaviour.
146    
147    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
148        RunGrepTest script failed.
149    
150    18. Change 22 for version 13 caused atomic groups to use more stack. This is
151        inevitable for groups that contain captures, but it can lead to a lot of
152        stack use in large patterns. The old behaviour has been restored for atomic
153        groups that do not contain any capturing parentheses.
154    
155    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
156        suppress the check for a minimum subject length at run time. (If it was
157        given to pcre_exec() or pcre_dfa_exec() it did work.)
158    
159    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
160        fail to work when decoding hex characters in data strings in EBCDIC
161        environments.
162    
163    21. It appears that in at least one Mac OS environment, the isxdigit() function
164        is implemented as a macro that evaluates to its argument more than once,
165        contravening the C 90 Standard (I haven't checked a later standard). There
166        was an instance in pcretest which caused it to go wrong when processing
167        \x{...} escapes in subject strings. The has been rewritten to avoid using
168        things like p++ in the argument of isxdigit().
169    
170    
171    Version 8.13 16-Aug-2011
172    ------------------------
173    
174    1.  The Unicode data tables have been updated to Unicode 6.0.0.
175    
176    2.  Two minor typos in pcre_internal.h have been fixed.
177    
178    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
179        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
180        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
181    
182    4.  There were a number of related bugs in the code for matching backrefences
183        caselessly in UTF-8 mode when codes for the characters concerned were
184        different numbers of bytes. For example, U+023A and U+2C65 are an upper
185        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
186        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
187        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
188        2-byte code at the end of the subject (it thought there wasn't enough data
189        left).
190    
191    5.  Comprehensive information about what went wrong is now returned by
192        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
193        as the output vector has at least 2 elements. The offset of the start of
194        the failing character and a reason code are placed in the vector.
195    
196    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
197        now returned is for the first byte of the failing character, instead of the
198        last byte inspected. This is an incompatible change, but I hope it is small
199        enough not to be a problem. It makes the returned offset consistent with
200        pcre_exec() and pcre_dfa_exec().
201    
202    7.  pcretest now gives a text phrase as well as the error number when
203        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
204        failure, the offset and reason code are output.
205    
206    8.  When \R was used with a maximizing quantifier it failed to skip backwards
207        over a \r\n pair if the subsequent match failed. Instead, it just skipped
208        back over a single character (\n). This seems wrong (because it treated the
209        two characters as a single entity when going forwards), conflicts with the
210        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
211        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
212        has been changed.
213    
214    9.  Some internal refactoring has changed the processing so that the handling
215        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
216        time (the PCRE_DOTALL option was changed this way some time ago: version
217        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
218        which was always a bit of a fudge. It also means that there is one less
219        argument for the match() function, which reduces its stack requirements
220        slightly. This change also fixes an incompatibility with Perl: the pattern
221        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
222    
223    10. More internal refactoring has drastically reduced the number of recursive
224        calls to match() for possessively repeated groups such as (abc)++ when
225        using pcre_exec().
226    
227    11. While implementing 10, a number of bugs in the handling of groups were
228        discovered and fixed:
229    
230        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
231        (a|)*(?1) gave a compile-time internal error.
232        ((a|)+)+  did not notice that the outer group could match an empty string.
233        (^a|^)+   was not marked as anchored.
234        (.*a|.*)+ was not marked as matching at start or after a newline.
235    
236    12. Yet more internal refactoring has removed another argument from the match()
237        function. Special calls to this function are now indicated by setting a
238        value in a variable in the "match data" data block.
239    
240    13. Be more explicit in pcre_study() instead of relying on "default" for
241        opcodes that mean there is no starting character; this means that when new
242        ones are added and accidentally left out of pcre_study(), testing should
243        pick them up.
244    
245    14. The -s option of pcretest has been documented for ages as being an old
246        synonym of -m (show memory usage). I have changed it to mean "force study
247        for every regex", that is, assume /S for every regex. This is similar to -i
248        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
249        using it. It makes it easier to run collections of tests with and without
250        study enabled, and thereby test pcre_study() more easily. All the standard
251        tests are now run with and without -s (but some patterns can be marked as
252        "never study" - see 20 below).
253    
254    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
255        restoration of the capturing data to the outer values was not happening
256        correctly.
257    
258    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
259        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
260        pattern had matched an empty string, and so incorrectly returned a no
261        match.
262    
263    17. There was optimizing code for the last branch of non-capturing parentheses,
264        and also for the obeyed branch of a conditional subexpression, which used
265        tail recursion to cut down on stack usage. Unfortunately, now that there is
266        the possibility of (*THEN) occurring in these branches, tail recursion is
267        no longer possible because the return has to be checked for (*THEN). These
268        two optimizations have therefore been removed. [But see 8.20/11 above.]
269    
270    18. If a pattern containing \R was studied, it was assumed that \R always
271        matched two bytes, thus causing the minimum subject length to be
272        incorrectly computed because \R can also match just one byte.
273    
274    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
275        was incorrectly computed.
276    
277    20. If /S is present twice on a test pattern in pcretest input, it now
278        *disables* studying, thereby overriding the use of -s on the command line
279        (see 14 above). This is necessary for one or two tests to keep the output
280        identical in both cases.
281    
282    21. When (*ACCEPT) was used in an assertion that matched an empty string and
283        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
284    
285    22. When an atomic group that contained a capturing parenthesis was
286        successfully matched, but the branch in which it appeared failed, the
287        capturing was not being forgotten if a higher numbered group was later
288        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
289        group 1 to "a", when in fact it should be unset. This applied to multi-
290        branched capturing and non-capturing groups, repeated or not, and also to
291        positive assertions (capturing in negative assertions does not happen
292        in PCRE) and also to nested atomic groups.
293    
294    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
295        subject after a captured substring, to make it easier to tell which of a
296        number of identical substrings has been captured.
297    
298    24. The way atomic groups are processed by pcre_exec() has been changed so that
299        if they are repeated, backtracking one repetition now resets captured
300        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
301        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
302        "aaa". Previously, it would have been "a". As part of this code
303        refactoring, the way recursive calls are handled has also been changed.
304    
305    25. If an assertion condition captured any substrings, they were not passed
306        back unless some other capturing happened later. For example, if
307        (?(?=(a))a) was matched against "a", no capturing was returned.
308    
309    26. When studying a pattern that contained subroutine calls or assertions,
310        the code for finding the minimum length of a possible match was handling
311        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
312        group 1 called group 2 while simultaneously a separate group 2 called group
313        1). A stack overflow occurred in this case. I have fixed this by limiting
314        the recursion depth to 10.
315    
316    27. Updated RunTest.bat in the distribution to the version supplied by Tom
317        Fortmann. This supports explicit test numbers on the command line, and has
318        argument validation and error reporting.
319    
320    28. An instance of \X with an unlimited repeat could fail if at any point the
321        first character it looked at was a mark character.
322    
323    29. Some minor code refactoring concerning Unicode properties and scripts
324        should reduce the stack requirement of match() slightly.
325    
326    30. Added the '=' option to pcretest to check the setting of unused capturing
327        slots at the end of the pattern, which are documented as being -1, but are
328        not included in the return count.
329    
330    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
331        compiled something random. Now it gives a compile-time error (as does
332        Perl).
333    
334    32. A *MARK encountered during the processing of a positive assertion is now
335        recorded and passed back (compatible with Perl).
336    
337    33. If --only-matching or --colour was set on a pcregrep call whose pattern
338        had alternative anchored branches, the search for a second match in a line
339        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
340        matched the line "0102" twice. The same bug affected patterns that started
341        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
342        twice.
343    
344    34. Previously, PCRE did not allow quantification of assertions. However, Perl
345        does, and because of capturing effects, quantifying parenthesized
346        assertions may at times be useful. Quantifiers are now allowed for
347        parenthesized assertions.
348    
349    35. A minor code tidy in pcre_compile() when checking options for \R usage.
350    
351    36. \g was being checked for fancy things in a character class, when it should
352        just be a literal "g".
353    
354    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
355        appearance of a nested POSIX class supersedes an apparent external class.
356        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
357        unescaped square brackets may also appear as part of class names. For
358        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
359        more like Perl. (But see 8.20/1 above.)
360    
361    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
362        was because it thought it was \N{name}, which is not supported).
363    
364    39. Add minix to OS list not supporting the -S option in pcretest.
365    
366    40. PCRE tries to detect cases of infinite recursion at compile time, but it
367        cannot analyze patterns in sufficient detail to catch mutual recursions
368        such as ((?1))((?2)). There is now a runtime test that gives an error if a
369        subgroup is called recursively as a subpattern for a second time at the
370        same position in the subject string. In previous releases this might have
371        been caught by the recursion limit, or it might have run out of stack.
372    
373    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
374        happen only once. PCRE was, however incorrectly giving a compile time error
375        "recursive call could loop indefinitely" because it cannot analyze the
376        pattern in sufficient detail. The compile time test no longer happens when
377        PCRE is compiling a conditional subpattern, but actual runaway loops are
378        now caught at runtime (see 40 above).
379    
380    42. It seems that Perl allows any characters other than a closing parenthesis
381        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
382        has been changed to be the same.
383    
384    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
385        as not to get warnings when autogen.sh is called. Also changed
386        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
387    
388    44. To help people who use pcregrep to scan files containing exceedingly long
389        lines, the following changes have been made:
390    
391        (a) The default value of the buffer size parameter has been increased from
392            8K to 20K. (The actual buffer used is three times this size.)
393    
394        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
395            PCRE is built.
396    
397        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
398            to be set at run time.
399    
400        (d) Numerical values in pcregrep options can be followed by K or M, for
401            example --buffer-size=50K.
402    
403        (e) If a line being scanned overflows pcregrep's buffer, an error is now
404            given and the return code is set to 2.
405    
406    45. Add a pointer to the latest mark to the callout data block.
407    
408    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
409        partial match of an empty string instead of no match. This was specific to
410        the use of ".".
411    
412    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
413        complete match instead of a partial match. This bug was dependent on both
414        the PCRE_UTF8 and PCRE_DOTALL options being set.
415    
416    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
417        starting byte set, because \b was not being ignored.
418    
419    
420    Version 8.12 15-Jan-2011
421    ------------------------
422    
423    1.  Fixed some typos in the markup of the man pages, and wrote a script that
424        checks for such things as part of the documentation building process.
425    
426    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
427        --match-limit and --recursion-limit options (added for 8.11). In
428        particular, this made one of the standard tests fail. (The integer value
429        went into the wrong half of a long int.)
430    
431    3.  If the --colour option was given to pcregrep with -v (invert match), it
432        did strange things, either producing crazy output, or crashing. It should,
433        of course, ignore a request for colour when reporting lines that do not
434        match.
435    
436    4.  Another pcregrep bug caused similar problems if --colour was specified with
437        -M (multiline) and the pattern match finished with a line ending.
438    
439    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
440        matched in multiline mode, the following line was shown as part of the
441        match. This seems wrong, so I have changed it.
442    
443    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
444        the check for further matches in the same line (so they could be coloured)
445        to overrun the end of the current line. If another match was found, it was
446        incorrectly shown (and then shown again when found in the next line).
447    
448    7.  If pcregrep was compiled under Windows, there was a reference to the
449        function pcregrep_exit() before it was defined. I am assuming this was
450        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
451        reported by a user. I've moved the definition above the reference.
452    
453    
454    Version 8.11 10-Dec-2010
455    ------------------------
456    
457    1.  (*THEN) was not working properly if there were untried alternatives prior
458        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
459        backtracked to try for "b" instead of moving to the next alternative branch
460        at the same level (in this case, to look for "c"). The Perl documentation
461        is clear that when (*THEN) is backtracked onto, it goes to the "next
462        alternative in the innermost enclosing group".
463    
464    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
465        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
466        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
467        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
468        (*THEN).
469    
470    3.  If \s appeared in a character class, it removed the VT character from
471        the class, even if it had been included by some previous item, for example
472        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
473        of \s, but is part of the POSIX "space" class.)
474    
475    4.  A partial match never returns an empty string (because you can always
476        match an empty string at the end of the subject); however the checking for
477        an empty string was starting at the "start of match" point. This has been
478        changed to the "earliest inspected character" point, because the returned
479        data for a partial match starts at this character. This means that, for
480        example, /(?<=abc)def/ gives a partial match for the subject "abc"
481        (previously it gave "no match").
482    
483    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
484        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
485        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
486        has an implication that the given string is incomplete (because a partial
487        match is preferred over a full match). For this reason, these items now
488        give a partial match in this situation. [Aside: previously, the one case
489        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
490        match rather than a full match, which was wrong by the old rules, but is
491        now correct.]
492    
493    6.  There was a bug in the handling of #-introduced comments, recognized when
494        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
495        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
496        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
497        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
498        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
499        places in pcre_compile().
500    
501    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
502        comments when looking ahead for named forward references to subpatterns,
503        the only newline sequence it recognized was NL. It now handles newlines
504        according to the set newline convention.
505    
506    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
507        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
508        cater for a lack of strerror(). These oversights have been fixed.
509    
510    9.  Added --match-limit and --recursion-limit to pcregrep.
511    
512    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
513    
514    11. When the -o option was used, pcregrep was setting a return code of 1, even
515        when matches were found, and --line-buffered was not being honoured.
516    
517    12. Added an optional parentheses number to the -o and --only-matching options
518        of pcregrep.
519    
520    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
521        can match an empty string. The code to do it in pcretest and pcredemo
522        needed fixing:
523    
524        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
525            only one byte after an empty string match just before CRLF (this case
526            just got forgotten; "any" and "anycrlf" were OK).
527    
528        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
529            mode when an empty string match preceded an ASCII character followed by
530            a non-ASCII character. (The code for advancing by one character rather
531            than one byte was nonsense.)
532    
533        (c) The pcredemo.c sample program did not have any code at all to handle
534            the cases when CRLF is a valid newline sequence.
535    
536    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
537        as a starting offset was within the subject string. There is now a new
538        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
539        negative or greater than the length of the string. In order to test this,
540        pcretest is extended to allow the setting of negative starting offsets.
541    
542    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
543        starting offset points to the beginning of a UTF-8 character was
544        unnecessarily clumsy. I tidied it up.
545    
546    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
547        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
548    
549    17. Nobody had reported that the --include_dir option, which was added in
550        release 7.7 should have been called --include-dir (hyphen, not underscore)
551        for compatibility with GNU grep. I have changed it to --include-dir, but
552        left --include_dir as an undocumented synonym, and the same for
553        --exclude-dir, though that is not available in GNU grep, at least as of
554        release 2.5.4.
555    
556    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
557        characters from a string of bytes) have been redefined so as not to use
558        loops, in order to improve performance in some environments. At the same
559        time, I abstracted some of the common code into auxiliary macros to save
560        repetition (this should not affect the compiled code).
561    
562    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
563        compile-time error is now given if \c is not followed by an ASCII
564        character, that is, a byte less than 128. (In EBCDIC mode, the code is
565        different, and any byte value is allowed.)
566    
567    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
568        START_OPTIMIZE option, which is now allowed at compile time - but just
569        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
570        to pcregrep and other applications that have no direct access to PCRE
571        options. The new /Y option in pcretest sets this option when calling
572        pcre_compile().
573    
574    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
575        back references. Groups containing recursive back references were forced to
576        be atomic by that change, but in the case of named groups, the amount of
577        memory required was incorrectly computed, leading to "Failed: internal
578        error: code overflow". This has been fixed.
579    
580    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
581        pcretest.c, to avoid build problems in some Borland environments.
582    
583    
584    Version 8.10 25-Jun-2010
585    ------------------------
586    
587    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
588        THEN.
589    
590    2.  (*ACCEPT) was not working when inside an atomic group.
591    
592    3.  Inside a character class, \B is treated as a literal by default, but
593        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
594        causes the error). The code is unchanged, but I tidied the documentation.
595    
596    4.  Inside a character class, PCRE always treated \R and \X as literals,
597        whereas Perl faults them if its -w option is set. I have changed PCRE so
598        that it faults them when PCRE_EXTRA is set.
599    
600    5.  Added support for \N, which always matches any character other than
601        newline. (It is the same as "." when PCRE_DOTALL is not set.)
602    
603    6.  When compiling pcregrep with newer versions of gcc which may have
604        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
605        declared with attribute warn_unused_result" were given. Just casting the
606        result to (void) does not stop the warnings; a more elaborate fudge is
607        needed. I've used a macro to implement this.
608    
609    7.  Minor change to pcretest.c to avoid a compiler warning.
610    
611    8.  Added four artifical Unicode properties to help with an option to make
612        \s etc use properties (see next item). The new properties are: Xan
613        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
614    
615    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
616        use Unicode properties. (*UCP) at the start of a pattern can be used to set
617        this option. Modified pcretest to add /W to test this facility. Added
618        REG_UCP to make it available via the POSIX interface.
619    
620    10. Added --line-buffered to pcregrep.
621    
622    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
623        studied, and the match started with a letter with a code point greater than
624        127 whose first byte was different to the first byte of the other case of
625        the letter, the other case of this starting letter was not recognized
626        (#976).
627    
628    12. If a pattern that was studied started with a repeated Unicode property
629        test, for example, \p{Nd}+, there was the theoretical possibility of
630        setting up an incorrect bitmap of starting bytes, but fortunately it could
631        not have actually happened in practice until change 8 above was made (it
632        added property types that matched character-matching opcodes).
633    
634    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
635        possible starting bytes for non-anchored patterns.
636    
637    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
638        \R, and also a number of cases that involve Unicode properties, both
639        explicit and implicit when PCRE_UCP is set.
640    
641    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
642        input, it could crash or give wrong results if characters with values
643        greater than 0xc0 were present in the subject string. (Detail: it assumed
644        UTF-8 input when processing these items.)
645    
646    16. Added a lot of (int) casts to avoid compiler warnings in systems where
647        size_t is 64-bit (#991).
648    
649    17. Added a check for running out of memory when PCRE is compiled with
650        --disable-stack-for-recursion (#990).
651    
652    18. If the last data line in a file for pcretest does not have a newline on
653        the end, a newline was missing in the output.
654    
655    19. The default pcre_chartables.c file recognizes only ASCII characters (values
656        less than 128) in its various bitmaps. However, there is a facility for
657        generating tables according to the current locale when PCRE is compiled. It
658        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
659        characters, are recognized by isspace() and therefore were getting set in
660        these tables, and indeed these tables seem to approximate to ISO 8859. This
661        caused a problem in UTF-8 mode when pcre_study() was used to create a list
662        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
663        which of course cannot start UTF-8 characters. I have changed the code so
664        that only real ASCII characters (less than 128) and the correct starting
665        bytes for UTF-8 encodings are set for characters greater than 127 when in
666        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
667        altogether.)
668    
669    20. Added the /T option to pcretest so as to be able to run tests with non-
670        standard character tables, thus making it possible to include the tests
671        used for 19 above in the standard set of tests.
672    
673    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
674        reference to a subpattern the other side of a comment that contains an
675        opening parenthesis caused either an internal compiling error, or a
676        reference to the wrong subpattern.
677    
678    
679    Version 8.02 19-Mar-2010
680    ------------------------
681    
682    1.  The Unicode data tables have been updated to Unicode 5.2.0.
683    
684    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
685        configured.
686    
687    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
688        original author of that file, following a query about its status.
689    
690    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
691        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
692    
693    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
694        quantifier applied to a forward-referencing subroutine call, could compile
695        incorrect code or give the error "internal error: previously-checked
696        referenced subpattern not found".
697    
698    6.  Both MS Visual Studio and Symbian OS have problems with initializing
699        variables to point to external functions. For these systems, therefore,
700        pcre_malloc etc. are now initialized to local functions that call the
701        relevant global functions.
702    
703    7.  There were two entries missing in the vectors called coptable and poptable
704        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
705        I've fixed the data, and added a kludgy way of testing at compile time that
706        the lengths are correct (equal to the number of opcodes).
707    
708    8.  Following on from 7, I added a similar kludge to check the length of the
709        eint vector in pcreposix.c.
710    
711    9.  Error texts for pcre_compile() are held as one long string to avoid too
712        much relocation at load time. To find a text, the string is searched,
713        counting zeros. There was no check for running off the end of the string,
714        which could happen if a new error number was added without updating the
715        string.
716    
717    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
718    
719    11. \K was not working if it appeared in an atomic group or in a group that
720        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
721        \K is "not well defined" if used in an assertion. PCRE now accepts it if
722        the assertion is positive, but not if it is negative.
723    
724    12. Change 11 fortuitously reduced the size of the stack frame used in the
725        "match()" function of pcre_exec.c by one pointer. Forthcoming
726        implementation of support for (*MARK) will need an extra pointer on the
727        stack; I have reserved it now, so that the stack frame size does not
728        decrease.
729    
730    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
731        item in branch that calls a recursion is a subroutine call - as in the
732        second branch in the above example - was incorrectly given the compile-
733        time error "recursive call could loop indefinitely" because pcre_compile()
734        was not correctly checking the subroutine for matching a non-empty string.
735    
736    14. The checks for overrunning compiling workspace could trigger after an
737        overrun had occurred. This is a "should never occur" error, but it can be
738        triggered by pathological patterns such as hundreds of nested parentheses.
739        The checks now trigger 100 bytes before the end of the workspace.
740    
741    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
742    
743    
744    Version 8.01 19-Jan-2010
745    ------------------------
746    
747    1.  If a pattern contained a conditional subpattern with only one branch (in
748        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
749        computed the wrong minimum data length (which is of course zero for such
750        subpatterns). This could cause incorrect "no match" results.
751    
752    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
753        the pattern is reset in the first branch, pcre_compile() failed with
754        "internal error: code overflow at offset...". This happened only when
755        the reset was to the original external option setting. (An optimization
756        abstracts leading options settings into an external setting, which was the
757        cause of this.)
758    
759    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
760        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
761        assertion pattern did not match (meaning that the assertion was true), it
762        was incorrectly treated as false if the SKIP had been reached during the
763        matching. This also applied to assertions used as conditions.
764    
765    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
766        assertion subpattern, including such a pattern used as a condition,
767        unpredictable results occurred, instead of the error return
768        PCRE_ERROR_DFA_UITEM.
769    
770    5.  The C++ GlobalReplace function was not working like Perl for the special
771        situation when an empty string is matched. It now does the fancy magic
772        stuff that is necessary.
773    
774    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
775        removed. (These were left over from very, very early versions of PCRE.)
776    
777    7.  Some cosmetic changes to the code to make life easier when compiling it
778        as part of something else:
779    
780        (a) Change DEBUG to PCRE_DEBUG.
781    
782        (b) In pcre_compile(), rename the member of the "branch_chain" structure
783            called "current" as "current_branch", to prevent a collision with the
784            Linux macro when compiled as a kernel module.
785    
786        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
787            prevent a collision with the Linux macro when compiled as a kernel
788            module.
789    
790    8.  In pcre_compile() there are some checks for integer overflows that used to
791        cast potentially large values to (double). This has been changed to that
792        when building, a check for int64_t is made, and if it is found, it is used
793        instead, thus avoiding the use of floating point arithmetic. (There is no
794        other use of FP in PCRE.) If int64_t is not found, the fallback is to
795        double.
796    
797    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
798        2005 (difference between two addresses compared to an unsigned value).
799    
800    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
801        custom one, because of the following reported problem in Windows:
802    
803          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
804              under Win32.
805          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
806              therefore missing the function definition.
807          - The compiler thus generates a "C" signature for the test function.
808          - The linker fails to find the "C" function.
809          - PCRE fails to configure if asked to do so against libbz2.
810    
811    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
812        messages were output:
813    
814          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
815          rerunning libtoolize, to keep the correct libtool macros in-tree.
816          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
817    
818        I have done both of these things.
819    
820    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
821        most of the time, it *can* run out if it is given a pattern that contains a
822        runaway infinite recursion. I updated the discussion in the pcrestack man
823        page.
824    
825    13. Now that we have gone to the x.xx style of version numbers, the minor
826        version may start with zero. Using 08 or 09 is a bad idea because users
827        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
828        interpreted as invalid octal numbers. I've updated the previous comment in
829        configure.ac, and also added a check that gives an error if 08 or 09 are
830        used.
831    
832    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
833        causing partial matching to fail when the end of the subject matched \W
834        in a UTF-8 pattern where \W was quantified with a minimum of 3.
835    
836    15. There were some discrepancies between the declarations in pcre_internal.h
837        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
838        their definitions. The declarations used "const uschar *" and the
839        definitions used USPTR. Even though USPTR is normally defined as "const
840        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
841        reported that: "This difference in casting confuses some C++ compilers, for
842        example, SunCC recognizes above declarations as different functions and
843        generates broken code for hbpcre." I have changed the declarations to use
844        USPTR.
845    
846    16. GNU libtool is named differently on some systems. The autogen.sh script now
847        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
848        (FreeBSD).
849    
850    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
851        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
852        comment: "Figure out how to create a longlong from a string: strtoll and
853        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
854        instance, but it only takes 2 args instead of 3!"
855    
856    18. A subtle bug concerned with back references has been fixed by a change of
857        specification, with a corresponding code fix. A pattern such as
858        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
859        refers, was giving matches when it shouldn't. For example, xa=xaaa would
860        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
861        same bug. Such groups have to be quantified to be useful, or contained
862        inside another quantified group. (If there's no repetition, the reference
863        can never match.) The problem arises because, having left the group and
864        moved on to the rest of the pattern, a later failure that backtracks into
865        the group uses the captured value from the final iteration of the group
866        rather than the correct earlier one. I have fixed this in PCRE by forcing
867        any group that contains a reference to itself to be an atomic group; that
868        is, there cannot be any backtracking into it once it has completed. This is
869        similar to recursive and subroutine calls.
870    
871    
872    Version 8.00 19-Oct-09
873    ----------------------
874    
875    1.  The table for translating pcre_compile() error codes into POSIX error codes
876        was out-of-date, and there was no check on the pcre_compile() error code
877        being within the table. This could lead to an OK return being given in
878        error.
879    
880    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
881        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
882        in a Windows environment.
883    
884    3.  The pcregrep --count option prints the count for each file even when it is
885        zero, as does GNU grep. However, pcregrep was also printing all files when
886        --files-with-matches was added. Now, when both options are given, it prints
887        counts only for those files that have at least one match. (GNU grep just
888        prints the file name in this circumstance, but including the count seems
889        more useful - otherwise, why use --count?) Also ensured that the
890        combination -clh just lists non-zero counts, with no names.
891    
892    4.  The long form of the pcregrep -F option was incorrectly implemented as
893        --fixed_strings instead of --fixed-strings. This is an incompatible change,
894        but it seems right to fix it, and I didn't think it was worth preserving
895        the old behaviour.
896    
897    5.  The command line items --regex=pattern and --regexp=pattern were not
898        recognized by pcregrep, which required --regex pattern or --regexp pattern
899        (with a space rather than an '='). The man page documented the '=' forms,
900        which are compatible with GNU grep; these now work.
901    
902    6.  No libpcreposix.pc file was created for pkg-config; there was just
903        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
904    
905    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
906        when UCP support is not needed, by modifying the Python script that
907        generates it from Unicode data files. This should not matter if the module
908        is correctly used as a library, but I received one complaint about 50K of
909        unwanted data. My guess is that the person linked everything into his
910        program rather than using a library. Anyway, it does no harm.
911    
912    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
913        was a minimum greater than 1 for a wide character in a possessive
914        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
915        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
916        character. Chaos in the form of incorrect output or a compiling loop could
917        result.
918    
919    9.  The restrictions on what a pattern can contain when partial matching is
920        requested for pcre_exec() have been removed. All patterns can now be
921        partially matched by this function. In addition, if there are at least two
922        slots in the offset vector, the offset of the earliest inspected character
923        for the match and the offset of the end of the subject are set in them when
924        PCRE_ERROR_PARTIAL is returned.
925    
926    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
927        synonymous with PCRE_PARTIAL, for backwards compatibility, and
928        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
929        and may be more useful for multi-segment matching.
930    
931    11. Partial matching with pcre_exec() is now more intuitive. A partial match
932        used to be given if ever the end of the subject was reached; now it is
933        given only if matching could not proceed because another character was
934        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
935        string "Z", which now yields "no match" instead of "partial match". In the
936        case of pcre_dfa_exec(), "no match" is given if every matching path for the
937        final character ended with (*FAIL).
938    
939    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
940        if the pattern had a "must contain" character that was already found in the
941        earlier partial match, unless partial matching was again requested. For
942        example, with the pattern /dog.(body)?/, the "must contain" character is
943        "g". If the first part-match was for the string "dog", restarting with
944        "sbody" failed. This bug has been fixed.
945    
946    13. The string returned by pcre_dfa_exec() after a partial match has been
947        changed so that it starts at the first inspected character rather than the
948        first character of the match. This makes a difference only if the pattern
949        starts with a lookbehind assertion or \b or \B (\K is not supported by
950        pcre_dfa_exec()). It's an incompatible change, but it makes the two
951        matching functions compatible, and I think it's the right thing to do.
952    
953    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
954        so that the demonstration program is easily available in environments where
955        PCRE has not been installed from source.
956    
957    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
958        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
959        library.
960    
961    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
962        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
963        is not the first non-POSIX option to be added. Clearly some people find
964        these options useful.
965    
966    17. If a caller to the POSIX matching function regexec() passes a non-zero
967        value for nmatch with a NULL value for pmatch, the value of
968        nmatch is forced to zero.
969    
970    18. RunGrepTest did not have a test for the availability of the -u option of
971        the diff command, as RunTest does. It now checks in the same way as
972        RunTest, and also checks for the -b option.
973    
974    19. If an odd number of negated classes containing just a single character
975        interposed, within parentheses, between a forward reference to a named
976        subpattern and the definition of the subpattern, compilation crashed with
977        an internal error, complaining that it could not find the referenced
978        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
979        [The bug was that it was starting one character too far in when skipping
980        over the character class, thus treating the ] as data rather than
981        terminating the class. This meant it could skip too much.]
982    
983    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
984        /g option in pcretest when the pattern contains \K, which makes it possible
985        to have an empty string match not at the start, even when the pattern is
986        anchored. Updated pcretest and pcredemo to use this option.
987    
988    21. If the maximum number of capturing subpatterns in a recursion was greater
989        than the maximum at the outer level, the higher number was returned, but
990        with unset values at the outer level. The correct (outer level) value is
991        now given.
992    
993    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
994        PCRE did not set those parentheses (unlike Perl). I have now found a way to
995        make it do so. The string so far is captured, making this feature
996        compatible with Perl.
997    
998    23. The tests have been re-organized, adding tests 11 and 12, to make it
999        possible to check the Perl 5.10 features against Perl 5.10.
1000    
1001    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
1002        pattern matches a fixed length string. PCRE did not allow this; now it
1003        does. Neither allows recursion.
1004    
1005    25. I finally figured out how to implement a request to provide the minimum
1006        length of subject string that was needed in order to match a given pattern.
1007        (It was back references and recursion that I had previously got hung up
1008        on.) This code has now been added to pcre_study(); it finds a lower bound
1009        to the length of subject needed. It is not necessarily the greatest lower
1010        bound, but using it to avoid searching strings that are too short does give
1011        some useful speed-ups. The value is available to calling programs via
1012        pcre_fullinfo().
1013    
1014    26. While implementing 25, I discovered to my embarrassment that pcretest had
1015        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
1016        study optimizations had never been tested with that matching function.
1017        Oops. What is worse, even when it was passed study data, there was a bug in
1018        pcre_dfa_exec() that meant it never actually used it. Double oops. There
1019        were also very few tests of studied patterns with pcre_dfa_exec().
1020    
1021    27. If (?| is used to create subpatterns with duplicate numbers, they are now
1022        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
1023        on the other side of the coin, they are no longer allowed to have different
1024        names, because these cannot be distinguished in PCRE, and this has caused
1025        confusion. (This is a difference from Perl.)
1026    
1027    28. When duplicate subpattern names are present (necessarily with different
1028        numbers, as required by 27 above), and a test is made by name in a
1029        conditional pattern, either for a subpattern having been matched, or for
1030        recursion in such a pattern, all the associated numbered subpatterns are
1031        tested, and the overall condition is true if the condition is true for any
1032        one of them. This is the way Perl works, and is also more like the way
1033        testing by number works.
1034    
1035    
1036    Version 7.9 11-Apr-09
1037    ---------------------
1038    
1039    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
1040        (pcretest), all targets were linked against these libraries. This included
1041        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
1042        libraries. This caused unwanted dependencies to be created. This problem
1043        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
1044        pcretest is linked with readline.
1045    
1046    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
1047        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
1048        moved outside it again, because FALSE and TRUE are already defined in AIX,
1049        but BOOL is not.
1050    
1051    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
1052        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
1053    
1054    4.  The pcregrep documentation said spaces were inserted as well as colons (or
1055        hyphens) following file names and line numbers when outputting matching
1056        lines. This is not true; no spaces are inserted. I have also clarified the
1057        wording for the --colour (or --color) option.
1058    
1059    5.  In pcregrep, when --colour was used with -o, the list of matching strings
1060        was not coloured; this is different to GNU grep, so I have changed it to be
1061        the same.
1062    
1063    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
1064        each matching line was coloured. Now it goes on to look for further matches
1065        of any of the test patterns, which is the same behaviour as GNU grep.
1066    
1067    7.  A pattern that could match an empty string could cause pcregrep to loop; it
1068        doesn't make sense to accept an empty string match in pcregrep, so I have
1069        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1070        seems to be how GNU grep behaves.
1071    
1072    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
1073        start or after a newline", because the conditional assertion was not being
1074        correctly handled. The rule now is that both the assertion and what follows
1075        in the first alternative must satisfy the test.
1076    
1077    9.  If auto-callout was enabled in a pattern with a conditional group whose
1078        condition was an assertion, PCRE could crash during matching, both with
1079        pcre_exec() and pcre_dfa_exec().
1080    
1081    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
1082        used for matching.
1083    
1084    11. Unicode property support in character classes was not working for
1085        characters (bytes) greater than 127 when not in UTF-8 mode.
1086    
1087    12. Added the -M command line option to pcretest.
1088    
1089    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
1090    
1091    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
1092    
1093    16. Added comments and documentation about mis-use of no_arg in the C++
1094        wrapper.
1095    
1096    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
1097        from Martin Jerabek that uses macro names for all relevant character and
1098        string constants.
1099    
1100    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
1101        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
1102        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
1103        these, but not everybody uses configure.
1104    
1105    19. A conditional group that had only one branch was not being correctly
1106        recognized as an item that could match an empty string. This meant that an
1107        enclosing group might also not be so recognized, causing infinite looping
1108        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
1109        with the subject "ab", where knowledge that the repeated group can match
1110        nothing is needed in order to break the loop.
1111    
1112    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
1113        exec(), but without supplying a callout function, matching went wrong.
1114    
1115    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
1116        leak if the size of the offset vector was greater than 30. When the vector
1117        is smaller, the saved offsets during recursion go onto a local stack
1118        vector, but for larger vectors malloc() is used. It was failing to free
1119        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
1120        error, in fact).
1121    
1122    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
1123        heapframe that is used only when UTF-8 support is enabled. This caused no
1124        problem, but was untidy.
1125    
1126    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
1127        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
1128        included within another project.
1129    
1130    24. Steven Van Ingelgem's patches to add more options to the CMake support,
1131        slightly modified by me:
1132    
1133          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
1134              not building pcregrep.
1135    
1136          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
1137              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
1138    
1139    25. Forward references, both numeric and by name, in patterns that made use of
1140        duplicate group numbers, could behave incorrectly or give incorrect errors,
1141        because when scanning forward to find the reference group, PCRE was not
1142        taking into account the duplicate group numbers. A pattern such as
1143        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
1144    
1145    26. Changed a few more instances of "const unsigned char *" to USPTR, making
1146        the feature of a custom pointer more persuasive (as requested by a user).
1147    
1148    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
1149        pcretest.c, inside #ifndefs, because it seems they are sometimes already
1150        pre-defined.
1151    
1152    28. Added support for (*UTF8) at the start of a pattern.
1153    
1154    29. Arrange for flags added by the "release type" setting in CMake to be shown
1155        in the configuration summary.
1156    
1157    
1158    Version 7.8 05-Sep-08
1159    ---------------------
1160    
1161    1.  Replaced UCP searching code with optimized version as implemented for Ad
1162        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
1163        stage table and inline lookup instead of a function, giving speed ups of 2
1164        to 5 times on some simple patterns that I tested. Permission was given to
1165        distribute the MultiStage2.py script that generates the tables (it's not in
1166        the tarball, but is in the Subversion repository).
1167    
1168    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
1169        scripts.
1170    
1171    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
1172        a group with a zero qualifier. The result of the study could be incorrect,
1173        or the function might crash, depending on the pattern.
1174    
1175    4.  Caseless matching was not working for non-ASCII characters in back
1176        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
1177        It now works when Unicode Property Support is available.
1178    
1179    5.  In pcretest, an escape such as \x{de} in the data was always generating
1180        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
1181        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
1182        truncation.
1183    
1184    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
1185    
1186    7.  Added two (int) casts to pcregrep when printing the difference of two
1187        pointers, in case they are 64-bit values.
1188    
1189    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
1190        test 2 if it fails.
1191    
1192    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
1193        and a #define of that name to empty if it is not externally set. This is to
1194        allow users of MSVC to set it if necessary.
1195    
1196    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
1197        the convenience functions in the pcre_get.c source file.
1198    
1199    11. An option change at the start of a pattern that had top-level alternatives
1200        could cause overwriting and/or a crash. This command provoked a crash in
1201        some environments:
1202    
1203          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
1204    
1205        This potential security problem was recorded as CVE-2008-2371.
1206    
1207    12. For a pattern where the match had to start at the beginning or immediately
1208        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
1209        pcre_dfa_exec() could read past the end of the passed subject if there was
1210        no match. To help with detecting such bugs (e.g. with valgrind), I modified
1211        pcretest so that it places the subject at the end of its malloc-ed buffer.
1212    
1213    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
1214        exec() might read past the end of the data buffer in UTF-8 mode.
1215    
1216    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
1217        the data contained the byte 0x85 as part of a UTF-8 character within its
1218        first line. This applied both to normal and DFA matching.
1219    
1220    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
1221        /^[^d]*?$/8 failed to match "abc".
1222    
1223    16. Added a missing copyright notice to pcrecpp_internal.h.
1224    
1225    17. Make it more clear in the documentation that values returned from
1226        pcre_exec() in ovector are byte offsets, not character counts.
1227    
1228    18. Tidied a few places to stop certain compilers from issuing warnings.
1229    
1230    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
1231        supplied by Stefan Weber. I made a further small update for 7.8 because
1232        there is a change of source arrangements: the pcre_searchfuncs.c module is
1233        replaced by pcre_ucd.c.
1234    
1235    
1236    Version 7.7 07-May-08
1237    ---------------------
1238    
1239    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
1240        a string to a long long, pretend we don't even have a long long." This is
1241        done by checking for the strtoq, strtoll, and _strtoi64 functions.
1242    
1243    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
1244        pre-7.6 versions, which defined a global no_arg variable instead of putting
1245        it in the RE class. (See also #8 below.)
1246    
1247    3.  Remove a line of dead code, identified by coverity and reported by Nuno
1248        Lopes.
1249    
1250    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
1251    
1252        (1) The include/exclude patterns were being applied to the whole pathnames
1253            of files, instead of just to the final components.
1254    
1255        (2) If there was more than one level of directory, the subdirectories were
1256            skipped unless they satisfied the include/exclude conditions. This is
1257            inconsistent with GNU grep (and could even be seen as contrary to the
1258            pcregrep specification - which I improved to make it absolutely clear).
1259            The action now is always to scan all levels of directory, and just
1260            apply the include/exclude patterns to regular files.
1261    
1262    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
1263        --exclude_dir in the tests to avoid scanning .svn directories.
1264    
1265    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
1266        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
1267        doesn't support NULs in patterns.
1268    
1269    7.  Added some missing "const"s to declarations of static tables in
1270        pcre_compile.c and pcre_dfa_exec.c.
1271    
1272    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
1273        caused by fix #2  above. (Subsequently also a second patch to fix the
1274        first patch. And a third patch - this was a messy problem.)
1275    
1276    9.  Applied Craig's patch to remove the use of push_back().
1277    
1278    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
1279        matching function regexec().
1280    
1281    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
1282        which, however, unlike Perl's \g{...}, are subroutine calls, not back
1283        references. PCRE supports relative numbers with this syntax (I don't think
1284        Oniguruma does).
1285    
1286    12. Previously, a group with a zero repeat such as (...){0} was completely
1287        omitted from the compiled regex. However, this means that if the group
1288        was called as a subroutine from elsewhere in the pattern, things went wrong
1289        (an internal error was given). Such groups are now left in the compiled
1290        pattern, with a new opcode that causes them to be skipped at execution
1291        time.
1292    
1293    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
1294        to the way PCRE behaves:
1295    
1296        (a) A lone ] character is dis-allowed (Perl treats it as data).
1297    
1298        (b) A back reference to an unmatched subpattern matches an empty string
1299            (Perl fails the current match path).
1300    
1301        (c) A data ] in a character class must be notated as \] because if the
1302            first data character in a class is ], it defines an empty class. (In
1303            Perl it is not possible to have an empty class.) The empty class []
1304            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
1305            The negative empty class [^] matches any one character, independently
1306            of the DOTALL setting.
1307    
1308    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
1309        non-existent subpattern following a character class starting with ']' and
1310        containing () gave an internal compiling error instead of "reference to
1311        non-existent subpattern". Fortunately, when the pattern did exist, the
1312        compiled code was correct. (When scanning forwards to check for the
1313        existencd of the subpattern, it was treating the data ']' as terminating
1314        the class, so got the count wrong. When actually compiling, the reference
1315        was subsequently set up correctly.)
1316    
1317    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
1318        it was being rejected as not supported by pcre_dfa_exec(), even though
1319        other assertions are supported. I have made pcre_dfa_exec() support
1320        (*FAIL).
1321    
1322    16. The implementation of 13c above involved the invention of a new opcode,
1323        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
1324        cannot be changed at match time, I realized I could make a small
1325        improvement to matching performance by compiling OP_ALLANY instead of
1326        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
1327        on the OP_ANY path.
1328    
1329    17. Compiling pcretest on Windows with readline support failed without the
1330        following two fixes: (1) Make the unistd.h include conditional on
1331        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
1332    
1333    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
1334        ncurses library to be included for pcretest when ReadLine support is
1335        requested, but also to allow for it to be overridden. This patch came from
1336        Daniel Bergström.
1337    
1338    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
1339        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
1340        any errors with the current Unicode tables. Thanks to Peter Kankowski for
1341        spotting this.
1342    
1343    
1344    Version 7.6 28-Jan-08
1345    ---------------------
1346    
1347    1.  A character class containing a very large number of characters with
1348        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
1349        overflow.
1350    
1351    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
1352        HAVE_LONG_LONG is not defined.
1353    
1354    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
1355        bring them up to date and include new features. This patch includes:
1356    
1357        - Fixed PH's badly added libz and libbz2 support.
1358        - Fixed a problem with static linking.
1359        - Added pcredemo. [But later removed - see 7 below.]
1360        - Fixed dftables problem and added an option.
1361        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
1362            HAVE_LONG_LONG.
1363        - Added readline support for pcretest.
1364        - Added an listing of the option settings after cmake has run.
1365    
1366    4.  A user submitted a patch to Makefile that makes it easy to create
1367        "pcre.dll" under mingw when using Configure/Make. I added stuff to
1368        Makefile.am that cause it to include this special target, without
1369        affecting anything else. Note that the same mingw target plus all
1370        the other distribution libraries and programs are now supported
1371        when configuring with CMake (see 6 below) instead of with
1372        Configure/Make.
1373    
1374    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
1375        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
1376        exported in the Windows port". It has not yet been confirmed that the patch
1377        solves the problem, but it does no harm.
1378    
1379    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
1380        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
1381        with CMake, and also correct the comment about stack recursion.
1382    
1383    7.  Remove the automatic building of pcredemo from the ./configure system and
1384        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
1385        of a program that users should build themselves after PCRE is installed, so
1386        building it automatically is not really right. What is more, it gave
1387        trouble in some build environments.
1388    
1389    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
1390    
1391    
1392    Version 7.5 10-Jan-08
1393    ---------------------
1394    
1395    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
1396        values in parens when parsing an RE using the C++ wrapper."
1397    
1398    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
1399        Characters greater than 255 were excluded from the class instead of being
1400        included.
1401    
1402    3.  The same bug as (2) above applied to negated POSIX classes such as
1403        [:^space:].
1404    
1405    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
1406        defined or documented. It seems to have been a typo for PCRE_STATIC, so
1407        I have changed it.
1408    
1409    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
1410        first named subpattern) and a construct such as (?&a) would reference the
1411        first named subpattern whose name started with "a" (in other words, the
1412        length check was missing). Both these problems are fixed. "Subpattern name
1413        expected" is now given for (?&) (a zero-length name), and this patch also
1414        makes it give the same error for \k'' (previously it complained that that
1415        was a reference to a non-existent subpattern).
1416    
1417    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
1418        this is right because (?- can be followed by option settings as well as by
1419        digits. I have, however, made the messages clearer.
1420    
1421    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
1422        than the number used in the conditional) now cause a compile-time error.
1423        This is actually not compatible with Perl, which accepts such patterns, but
1424        treats the conditional as always being FALSE (as PCRE used to), but it
1425        seems to me that giving a diagnostic is better.
1426    
1427    8.  Change "alphameric" to the more common word "alphanumeric" in comments
1428        and messages.
1429    
1430    9.  Fix two occurrences of "backslash" in comments that should have been
1431        "backspace".
1432    
1433    10. Remove two redundant lines of code that can never be obeyed (their function
1434        was moved elsewhere).
1435    
1436    11. The program that makes PCRE's Unicode character property table had a bug
1437        which caused it to generate incorrect table entries for sequences of
1438        characters that have the same character type, but are in different scripts.
1439        It amalgamated them into a single range, with the script of the first of
1440        them. In other words, some characters were in the wrong script. There were
1441        thirteen such cases, affecting characters in the following ranges:
1442    
1443          U+002b0 - U+002c1
1444          U+0060c - U+0060d
1445          U+0061e - U+00612
1446          U+0064b - U+0065e
1447          U+0074d - U+0076d
1448          U+01800 - U+01805
1449          U+01d00 - U+01d77
1450          U+01d9b - U+01dbf
1451          U+0200b - U+0200f
1452          U+030fc - U+030fe
1453          U+03260 - U+0327f
1454          U+0fb46 - U+0fbb1
1455          U+10450 - U+1049d
1456    
1457    12. The -o option (show only the matching part of a line) for pcregrep was not
1458        compatible with GNU grep in that, if there was more than one match in a
1459        line, it showed only the first of them. It now behaves in the same way as
1460        GNU grep.
1461    
1462    13. If the -o and -v options were combined for pcregrep, it printed a blank
1463        line for every non-matching line. GNU grep prints nothing, and pcregrep now
1464        does the same. The return code can be used to tell if there were any
1465        non-matching lines.
1466    
1467    14. Added --file-offsets and --line-offsets to pcregrep.
1468    
1469    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
1470        infinitely looping recursion. The bug was that positive lookaheads were not
1471        being skipped when checking for a possible empty match (negative lookaheads
1472        and both kinds of lookbehind were skipped).
1473    
1474    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
1475        inclusion of <windows.h> to before rather than after the definition of
1476        INVALID_FILE_ATTRIBUTES (patch from David Byron).
1477    
1478    17. Specifying a possessive quantifier with a specific limit for a Unicode
1479        character property caused pcre_compile() to compile bad code, which led at
1480        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
1481        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
1482        caused the error; without that there was no problem.
1483    
1484    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
1485    
1486    19. Added --enable-pcretest-libreadline.
1487    
1488    20. In pcrecpp.cc, the variable 'count' was incremented twice in
1489        RE::GlobalReplace(). As a result, the number of replacements returned was
1490        double what it should be. I removed one of the increments, but Craig sent a
1491        later patch that removed the other one (the right fix) and added unit tests
1492        that check the return values (which was not done before).
1493    
1494    21. Several CMake things:
1495    
1496        (1) Arranged that, when cmake is used on Unix, the libraries end up with
1497            the names libpcre and libpcreposix, not just pcre and pcreposix.
1498    
1499        (2) The above change means that pcretest and pcregrep are now correctly
1500            linked with the newly-built libraries, not previously installed ones.
1501    
1502        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
1503    
1504    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
1505        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
1506        UTF-8 newline character). The key issue is that the pattern starts .*;
1507        this means that the match must be either at the beginning, or after a
1508        newline. The bug was in the code for advancing after a failed match and
1509        checking that the new position followed a newline. It was not taking
1510        account of UTF-8 characters correctly.
1511    
1512    23. PCRE was behaving differently from Perl in the way it recognized POSIX
1513        character classes. PCRE was not treating the sequence [:...:] as a
1514        character class unless the ... were all letters. Perl, however, seems to
1515        allow any characters between [: and :], though of course it rejects as
1516        unknown any "names" that contain non-letters, because all the known class
1517        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
1518        for example, whereas PCRE did not - it did not recognize a POSIX character
1519        class. This seemed a bit dangerous, so the code has been changed to be
1520        closer to Perl. The behaviour is not identical to Perl, because PCRE will
1521        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
1522        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
1523        Perl does, and where it didn't before.
1524    
1525    24. Rewrite so as to remove the single use of %n from pcregrep because in some
1526        Windows environments %n is disabled by default.
1527    
1528    
1529    Version 7.4 21-Sep-07
1530  ---------------------  ---------------------
1531    
1532  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This  1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
# Line 33  Version 7.4 10-Sep-07 Line 1558  Version 7.4 10-Sep-07
1558    
1559  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and  7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
1560      strtoull to pcrecpp.cc to select the available functions in WIN32 when the      strtoull to pcrecpp.cc to select the available functions in WIN32 when the
1561      windows.h file is present (where different names are used).      windows.h file is present (where different names are used). [This was
1562        reversed later after testing - see 16 below.]
1563    
1564  8.  Changed all #include <config.h> to #include "config.h". There were also  8.  Changed all #include <config.h> to #include "config.h". There were also
1565      some further <pcre.h> cases that I changed to "pcre.h".      some further <pcre.h> cases that I changed to "pcre.h".
# Line 62  Version 7.4 10-Sep-07 Line 1588  Version 7.4 10-Sep-07
1588    
1589  13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously  13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
1590      checked only for CRLF.      checked only for CRLF.
1591    
1592  14. Added casts to pcretest.c to avoid compiler warnings.  14. Added casts to pcretest.c to avoid compiler warnings.
1593    
1594  15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.  15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
1595    
1596    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
1597        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
1598        entirely. This removes changes made in 7 above.
1599    
1600    17. The CMake files have been updated, and there is now more information about
1601        building with CMake in the NON-UNIX-USE document.
1602    
1603    
1604  Version 7.3 28-Aug-07  Version 7.3 28-Aug-07
1605  ---------------------  ---------------------

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