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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.10 03 May-2010  Version 8.20 12-Sep-2011
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. This bug also affected patterns with classes that started
11       with full stops.
12    
13    2. If a pattern such as /(a)b|ac/ is matched against "ac", there is no captured
14       substring, but while checking the failing first alternative, substring 1 is
15       temporarily captured. If the output vector supplied to pcre_exec() was not
16       big enough for this capture, the yield of the function was still zero
17       ("insufficient space for captured substrings"). This cannot be totally fixed
18       without adding another stack variable, which seems a lot of expense for a
19       edge case. However, I have improved the situation in cases such as
20       /(a)(b)x|abc/ matched against "abc", where the return code indicates that
21       fewer than the maximum number of slots in the ovector have been set.
22    
23    3. Related to (2) above: when there are more back references in a pattern than
24       slots in the output vector, pcre_exec() uses temporary memory during
25       matching, and copies in the captures as far as possible afterwards. It was
26       using the entire output vector, but this conflicts with the specification
27       that only 2/3 is used for passing back captured substrings. Now it uses only
28       the first 2/3, for compatibility. This is, of course, another edge case.
29    
30    4. Zoltan Herczeg's just-in-time compiler support has been integrated into the
31       main code base, and can be used by building with --enable-jit. When this is
32       done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
33       runtime --no-jit option is given.
34    
35    5. When the number of matches in a pcre_dfa_exec() run exactly filled the
36       ovector, the return from the function was zero, implying that there were
37       other matches that did not fit. The correct "exactly full" value is now
38       returned.
39    
40    6. If a subpattern that was called recursively or as a subroutine contained
41       (*PRUNE) or any other control that caused it to give a non-standard return,
42       invalid errors such as "Error -26 (nested recursion at the same subject
43       position)" or even infinite loops could occur.
44    
45    7. If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
46       computing the minimum length on reaching *ACCEPT, and so ended up with the
47       wrong value of 1 rather than 0. Further investigation indicates that
48       computing a minimum subject length in the presence of *ACCEPT is difficult
49       (think back references, subroutine calls), and so I have changed the code so
50       that no minimum is registered for a pattern that contains *ACCEPT.
51    
52    
53    Version 8.13 16-Aug-2011
54    ------------------------
55    
56    1.  The Unicode data tables have been updated to Unicode 6.0.0.
57    
58    2.  Two minor typos in pcre_internal.h have been fixed.
59    
60    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
61        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
62        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
63    
64    4.  There were a number of related bugs in the code for matching backrefences
65        caselessly in UTF-8 mode when codes for the characters concerned were
66        different numbers of bytes. For example, U+023A and U+2C65 are an upper
67        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
68        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
69        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
70        2-byte code at the end of the subject (it thought there wasn't enough data
71        left).
72    
73    5.  Comprehensive information about what went wrong is now returned by
74        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
75        as the output vector has at least 2 elements. The offset of the start of
76        the failing character and a reason code are placed in the vector.
77    
78    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
79        now returned is for the first byte of the failing character, instead of the
80        last byte inspected. This is an incompatible change, but I hope it is small
81        enough not to be a problem. It makes the returned offset consistent with
82        pcre_exec() and pcre_dfa_exec().
83    
84    7.  pcretest now gives a text phrase as well as the error number when
85        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
86        failure, the offset and reason code are output.
87    
88    8.  When \R was used with a maximizing quantifier it failed to skip backwards
89        over a \r\n pair if the subsequent match failed. Instead, it just skipped
90        back over a single character (\n). This seems wrong (because it treated the
91        two characters as a single entity when going forwards), conflicts with the
92        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
93        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
94        has been changed.
95    
96    9.  Some internal refactoring has changed the processing so that the handling
97        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
98        time (the PCRE_DOTALL option was changed this way some time ago: version
99        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
100        which was always a bit of a fudge. It also means that there is one less
101        argument for the match() function, which reduces its stack requirements
102        slightly. This change also fixes an incompatibility with Perl: the pattern
103        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
104    
105    10. More internal refactoring has drastically reduced the number of recursive
106        calls to match() for possessively repeated groups such as (abc)++ when
107        using pcre_exec().
108    
109    11. While implementing 10, a number of bugs in the handling of groups were
110        discovered and fixed:
111    
112        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
113        (a|)*(?1) gave a compile-time internal error.
114        ((a|)+)+  did not notice that the outer group could match an empty string.
115        (^a|^)+   was not marked as anchored.
116        (.*a|.*)+ was not marked as matching at start or after a newline.
117    
118    12. Yet more internal refactoring has removed another argument from the match()
119        function. Special calls to this function are now indicated by setting a
120        value in a variable in the "match data" data block.
121    
122    13. Be more explicit in pcre_study() instead of relying on "default" for
123        opcodes that mean there is no starting character; this means that when new
124        ones are added and accidentally left out of pcre_study(), testing should
125        pick them up.
126    
127    14. The -s option of pcretest has been documented for ages as being an old
128        synonym of -m (show memory usage). I have changed it to mean "force study
129        for every regex", that is, assume /S for every regex. This is similar to -i
130        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
131        using it. It makes it easier to run collections of tests with and without
132        study enabled, and thereby test pcre_study() more easily. All the standard
133        tests are now run with and without -s (but some patterns can be marked as
134        "never study" - see 20 below).
135    
136    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
137        restoration of the capturing data to the outer values was not happening
138        correctly.
139    
140    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
141        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
142        pattern had matched an empty string, and so incorrectly returned a no
143        match.
144    
145    17. There was optimizing code for the last branch of non-capturing parentheses,
146        and also for the obeyed branch of a conditional subexpression, which used
147        tail recursion to cut down on stack usage. Unfortunately, now that there is
148        the possibility of (*THEN) occurring in these branches, tail recursion is
149        no longer possible because the return has to be checked for (*THEN). These
150        two optimizations have therefore been removed.
151    
152    18. If a pattern containing \R was studied, it was assumed that \R always
153        matched two bytes, thus causing the minimum subject length to be
154        incorrectly computed because \R can also match just one byte.
155    
156    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
157        was incorrectly computed.
158    
159    20. If /S is present twice on a test pattern in pcretest input, it now
160        *disables* studying, thereby overriding the use of -s on the command line
161        (see 14 above). This is necessary for one or two tests to keep the output
162        identical in both cases.
163    
164    21. When (*ACCEPT) was used in an assertion that matched an empty string and
165        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
166    
167    22. When an atomic group that contained a capturing parenthesis was
168        successfully matched, but the branch in which it appeared failed, the
169        capturing was not being forgotten if a higher numbered group was later
170        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
171        group 1 to "a", when in fact it should be unset. This applied to multi-
172        branched capturing and non-capturing groups, repeated or not, and also to
173        positive assertions (capturing in negative assertions does not happen
174        in PCRE) and also to nested atomic groups.
175    
176    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
177        subject after a captured substring, to make it easier to tell which of a
178        number of identical substrings has been captured.
179    
180    24. The way atomic groups are processed by pcre_exec() has been changed so that
181        if they are repeated, backtracking one repetition now resets captured
182        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
183        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
184        "aaa". Previously, it would have been "a". As part of this code
185        refactoring, the way recursive calls are handled has also been changed.
186    
187    25. If an assertion condition captured any substrings, they were not passed
188        back unless some other capturing happened later. For example, if
189        (?(?=(a))a) was matched against "a", no capturing was returned.
190    
191    26. When studying a pattern that contained subroutine calls or assertions,
192        the code for finding the minimum length of a possible match was handling
193        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
194        group 1 called group 2 while simultaneously a separate group 2 called group
195        1). A stack overflow occurred in this case. I have fixed this by limiting
196        the recursion depth to 10.
197    
198    27. Updated RunTest.bat in the distribution to the version supplied by Tom
199        Fortmann. This supports explicit test numbers on the command line, and has
200        argument validation and error reporting.
201    
202    28. An instance of \X with an unlimited repeat could fail if at any point the
203        first character it looked at was a mark character.
204    
205    29. Some minor code refactoring concerning Unicode properties and scripts
206        should reduce the stack requirement of match() slightly.
207    
208    30. Added the '=' option to pcretest to check the setting of unused capturing
209        slots at the end of the pattern, which are documented as being -1, but are
210        not included in the return count.
211    
212    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
213        compiled something random. Now it gives a compile-time error (as does
214        Perl).
215    
216    32. A *MARK encountered during the processing of a positive assertion is now
217        recorded and passed back (compatible with Perl).
218    
219    33. If --only-matching or --colour was set on a pcregrep call whose pattern
220        had alternative anchored branches, the search for a second match in a line
221        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
222        matched the line "0102" twice. The same bug affected patterns that started
223        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
224        twice.
225    
226    34. Previously, PCRE did not allow quantification of assertions. However, Perl
227        does, and because of capturing effects, quantifying parenthesized
228        assertions may at times be useful. Quantifiers are now allowed for
229        parenthesized assertions.
230    
231    35. A minor code tidy in pcre_compile() when checking options for \R usage.
232    
233    36. \g was being checked for fancy things in a character class, when it should
234        just be a literal "g".
235    
236    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
237        appearance of a nested POSIX class supersedes an apparent external class.
238        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
239        unescaped square brackets may also appear as part of class names. For
240        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
241        more like Perl. (But see 8.20/1 above.)
242    
243    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
244        was because it thought it was \N{name}, which is not supported).
245    
246    39. Add minix to OS list not supporting the -S option in pcretest.
247    
248    40. PCRE tries to detect cases of infinite recursion at compile time, but it
249        cannot analyze patterns in sufficient detail to catch mutual recursions
250        such as ((?1))((?2)). There is now a runtime test that gives an error if a
251        subgroup is called recursively as a subpattern for a second time at the
252        same position in the subject string. In previous releases this might have
253        been caught by the recursion limit, or it might have run out of stack.
254    
255    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
256        happen only once. PCRE was, however incorrectly giving a compile time error
257        "recursive call could loop indefinitely" because it cannot analyze the
258        pattern in sufficient detail. The compile time test no longer happens when
259        PCRE is compiling a conditional subpattern, but actual runaway loops are
260        now caught at runtime (see 40 above).
261    
262    42. It seems that Perl allows any characters other than a closing parenthesis
263        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
264        has been changed to be the same.
265    
266    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
267        as not to get warnings when autogen.sh is called. Also changed
268        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
269    
270    44. To help people who use pcregrep to scan files containing exceedingly long
271        lines, the following changes have been made:
272    
273        (a) The default value of the buffer size parameter has been increased from
274            8K to 20K. (The actual buffer used is three times this size.)
275    
276        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
277            PCRE is built.
278    
279        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
280            to be set at run time.
281    
282        (d) Numerical values in pcregrep options can be followed by K or M, for
283            example --buffer-size=50K.
284    
285        (e) If a line being scanned overflows pcregrep's buffer, an error is now
286            given and the return code is set to 2.
287    
288    45. Add a pointer to the latest mark to the callout data block.
289    
290    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
291        partial match of an empty string instead of no match. This was specific to
292        the use of ".".
293    
294    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
295        complete match instead of a partial match. This bug was dependent on both
296        the PCRE_UTF8 and PCRE_DOTALL options being set.
297    
298    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
299        starting byte set, because \b was not being ignored.
300    
301    
302    Version 8.12 15-Jan-2011
303    ------------------------
304    
305    1.  Fixed some typos in the markup of the man pages, and wrote a script that
306        checks for such things as part of the documentation building process.
307    
308    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
309        --match-limit and --recursion-limit options (added for 8.11). In
310        particular, this made one of the standard tests fail. (The integer value
311        went into the wrong half of a long int.)
312    
313    3.  If the --colour option was given to pcregrep with -v (invert match), it
314        did strange things, either producing crazy output, or crashing. It should,
315        of course, ignore a request for colour when reporting lines that do not
316        match.
317    
318    4.  Another pcregrep bug caused similar problems if --colour was specified with
319        -M (multiline) and the pattern match finished with a line ending.
320    
321    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
322        matched in multiline mode, the following line was shown as part of the
323        match. This seems wrong, so I have changed it.
324    
325    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
326        the check for further matches in the same line (so they could be coloured)
327        to overrun the end of the current line. If another match was found, it was
328        incorrectly shown (and then shown again when found in the next line).
329    
330    7.  If pcregrep was compiled under Windows, there was a reference to the
331        function pcregrep_exit() before it was defined. I am assuming this was
332        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
333        reported by a user. I've moved the definition above the reference.
334    
335    
336    Version 8.11 10-Dec-2010
337    ------------------------
338    
339    1.  (*THEN) was not working properly if there were untried alternatives prior
340        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
341        backtracked to try for "b" instead of moving to the next alternative branch
342        at the same level (in this case, to look for "c"). The Perl documentation
343        is clear that when (*THEN) is backtracked onto, it goes to the "next
344        alternative in the innermost enclosing group".
345    
346    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
347        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
348        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
349        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
350        (*THEN).
351    
352    3.  If \s appeared in a character class, it removed the VT character from
353        the class, even if it had been included by some previous item, for example
354        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
355        of \s, but is part of the POSIX "space" class.)
356    
357    4.  A partial match never returns an empty string (because you can always
358        match an empty string at the end of the subject); however the checking for
359        an empty string was starting at the "start of match" point. This has been
360        changed to the "earliest inspected character" point, because the returned
361        data for a partial match starts at this character. This means that, for
362        example, /(?<=abc)def/ gives a partial match for the subject "abc"
363        (previously it gave "no match").
364    
365    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
366        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
367        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
368        has an implication that the given string is incomplete (because a partial
369        match is preferred over a full match). For this reason, these items now
370        give a partial match in this situation. [Aside: previously, the one case
371        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
372        match rather than a full match, which was wrong by the old rules, but is
373        now correct.]
374    
375    6.  There was a bug in the handling of #-introduced comments, recognized when
376        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
377        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
378        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
379        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
380        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
381        places in pcre_compile().
382    
383    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
384        comments when looking ahead for named forward references to subpatterns,
385        the only newline sequence it recognized was NL. It now handles newlines
386        according to the set newline convention.
387    
388    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
389        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
390        cater for a lack of strerror(). These oversights have been fixed.
391    
392    9.  Added --match-limit and --recursion-limit to pcregrep.
393    
394    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
395    
396    11. When the -o option was used, pcregrep was setting a return code of 1, even
397        when matches were found, and --line-buffered was not being honoured.
398    
399    12. Added an optional parentheses number to the -o and --only-matching options
400        of pcregrep.
401    
402    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
403        can match an empty string. The code to do it in pcretest and pcredemo
404        needed fixing:
405    
406        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
407            only one byte after an empty string match just before CRLF (this case
408            just got forgotten; "any" and "anycrlf" were OK).
409    
410        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
411            mode when an empty string match preceded an ASCII character followed by
412            a non-ASCII character. (The code for advancing by one character rather
413            than one byte was nonsense.)
414    
415        (c) The pcredemo.c sample program did not have any code at all to handle
416            the cases when CRLF is a valid newline sequence.
417    
418    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
419        as a starting offset was within the subject string. There is now a new
420        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
421        negative or greater than the length of the string. In order to test this,
422        pcretest is extended to allow the setting of negative starting offsets.
423    
424    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
425        starting offset points to the beginning of a UTF-8 character was
426        unnecessarily clumsy. I tidied it up.
427    
428    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
429        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
430    
431    17. Nobody had reported that the --include_dir option, which was added in
432        release 7.7 should have been called --include-dir (hyphen, not underscore)
433        for compatibility with GNU grep. I have changed it to --include-dir, but
434        left --include_dir as an undocumented synonym, and the same for
435        --exclude-dir, though that is not available in GNU grep, at least as of
436        release 2.5.4.
437    
438    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
439        characters from a string of bytes) have been redefined so as not to use
440        loops, in order to improve performance in some environments. At the same
441        time, I abstracted some of the common code into auxiliary macros to save
442        repetition (this should not affect the compiled code).
443    
444    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
445        compile-time error is now given if \c is not followed by an ASCII
446        character, that is, a byte less than 128. (In EBCDIC mode, the code is
447        different, and any byte value is allowed.)
448    
449    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
450        START_OPTIMIZE option, which is now allowed at compile time - but just
451        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
452        to pcregrep and other applications that have no direct access to PCRE
453        options. The new /Y option in pcretest sets this option when calling
454        pcre_compile().
455    
456    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
457        back references. Groups containing recursive back references were forced to
458        be atomic by that change, but in the case of named groups, the amount of
459        memory required was incorrectly computed, leading to "Failed: internal
460        error: code overflow". This has been fixed.
461    
462    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
463        pcretest.c, to avoid build problems in some Borland environments.
464    
465    
466    Version 8.10 25-Jun-2010
467  ------------------------  ------------------------
468    
469  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and  1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
# Line 9  Version 8.10 03 May-2010 Line 471  Version 8.10 03 May-2010
471    
472  2.  (*ACCEPT) was not working when inside an atomic group.  2.  (*ACCEPT) was not working when inside an atomic group.
473    
474  3.  Inside a character class, \B is treated as a literal by default, but  3.  Inside a character class, \B is treated as a literal by default, but
475      faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option      faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
476      causes the error). The code is unchanged, but I tidied the documentation.      causes the error). The code is unchanged, but I tidied the documentation.
477    
478  4.  Inside a character class, PCRE always treated \R and \X as literals,  4.  Inside a character class, PCRE always treated \R and \X as literals,
479      whereas Perl faults them if its -w option is set. I have changed PCRE so      whereas Perl faults them if its -w option is set. I have changed PCRE so
480      that it faults them when PCRE_EXTRA is set.      that it faults them when PCRE_EXTRA is set.
481    
482  5.  Added support for \N, which always matches any character other than  5.  Added support for \N, which always matches any character other than
483      newline. (It is the same as "." when PCRE_DOTALL is not set.)      newline. (It is the same as "." when PCRE_DOTALL is not set.)
484    
485  6.  When compiling pcregrep with newer versions of gcc which may have  6.  When compiling pcregrep with newer versions of gcc which may have
486      FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',      FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
487      declared with attribute warn_unused_result" were given. Just casting the      declared with attribute warn_unused_result" were given. Just casting the
488      result to (void) does not stop the warnings; a more elaborate fudge is      result to (void) does not stop the warnings; a more elaborate fudge is
489      needed. I've used a macro to implement this.      needed. I've used a macro to implement this.
490    
491    7.  Minor change to pcretest.c to avoid a compiler warning.
492    
493    8.  Added four artifical Unicode properties to help with an option to make
494        \s etc use properties (see next item). The new properties are: Xan
495        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
496    
497    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
498        use Unicode properties. (*UCP) at the start of a pattern can be used to set
499        this option. Modified pcretest to add /W to test this facility. Added
500        REG_UCP to make it available via the POSIX interface.
501    
502    10. Added --line-buffered to pcregrep.
503    
504    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
505        studied, and the match started with a letter with a code point greater than
506        127 whose first byte was different to the first byte of the other case of
507        the letter, the other case of this starting letter was not recognized
508        (#976).
509    
510    12. If a pattern that was studied started with a repeated Unicode property
511        test, for example, \p{Nd}+, there was the theoretical possibility of
512        setting up an incorrect bitmap of starting bytes, but fortunately it could
513        not have actually happened in practice until change 8 above was made (it
514        added property types that matched character-matching opcodes).
515    
516    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
517        possible starting bytes for non-anchored patterns.
518    
519    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
520        \R, and also a number of cases that involve Unicode properties, both
521        explicit and implicit when PCRE_UCP is set.
522    
523    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
524        input, it could crash or give wrong results if characters with values
525        greater than 0xc0 were present in the subject string. (Detail: it assumed
526        UTF-8 input when processing these items.)
527    
528    16. Added a lot of (int) casts to avoid compiler warnings in systems where
529        size_t is 64-bit (#991).
530    
531    17. Added a check for running out of memory when PCRE is compiled with
532        --disable-stack-for-recursion (#990).
533    
534    18. If the last data line in a file for pcretest does not have a newline on
535        the end, a newline was missing in the output.
536    
537    19. The default pcre_chartables.c file recognizes only ASCII characters (values
538        less than 128) in its various bitmaps. However, there is a facility for
539        generating tables according to the current locale when PCRE is compiled. It
540        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
541        characters, are recognized by isspace() and therefore were getting set in
542        these tables, and indeed these tables seem to approximate to ISO 8859. This
543        caused a problem in UTF-8 mode when pcre_study() was used to create a list
544        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
545        which of course cannot start UTF-8 characters. I have changed the code so
546        that only real ASCII characters (less than 128) and the correct starting
547        bytes for UTF-8 encodings are set for characters greater than 127 when in
548        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
549        altogether.)
550    
551    20. Added the /T option to pcretest so as to be able to run tests with non-
552        standard character tables, thus making it possible to include the tests
553        used for 19 above in the standard set of tests.
554    
555    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
556        reference to a subpattern the other side of a comment that contains an
557        opening parenthesis caused either an internal compiling error, or a
558        reference to the wrong subpattern.
559    
560    
561  Version 8.02 19-Mar-2010  Version 8.02 19-Mar-2010

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