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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.02 01-Mar-2010  Version 8.21 05-Dec-2011
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    14. Perl does not support \N without a following name in a [] class; PCRE now
56        also gives an error.
57    
58    15. If a forward reference was repeated with an upper limit of around 2000,
59        it caused the error "internal error: overran compiling workspace". The
60        maximum number of forward references (including repeats) was limited by the
61        internal workspace, and dependent on the LINK_SIZE. The code has been
62        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
63        the default depends on LINK_SIZE. There is a new upper limit (for safety)
64        of around 200,000 forward references. While doing this, I also speeded up
65        the filling in of repeated forward references.
66    
67    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
68        incorrectly expecting the subject to contain another "a" after the start.
69    
70    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
71        in the match, the SKIP should be ignored. This was not happening; instead
72        the SKIP was being treated as NOMATCH. For patterns such as
73        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
74        tested.
75    
76    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
77        now much more compatible with Perl, in particular in cases where the result
78        is a non-match for a non-anchored pattern. For example, if
79        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
80        "m", where previously it did not return a name. A side effect of this
81        change is that for partial matches, the last encountered mark name is
82        returned, as for non matches. A number of tests that were previously not
83        Perl-compatible have been moved into the Perl-compatible test files. The
84        refactoring has had the pleasing side effect of removing one argument from
85        the match() function, thus reducing its stack requirements.
86    
87    19. If the /S+ option was used in pcretest to study a pattern using JIT,
88        subsequent uses of /S (without +) incorrectly behaved like /S+.
89    
90    21. Retrieve executable code size support for the JIT compiler and fixing
91        some warnings.
92    
93    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
94        not work when the shorter character appeared right at the end of the
95        subject string.
96    
97    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
98        systems.
99    
100    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
101        output it when the /M option is used in pcretest.
102    
103    25. The CheckMan script was not being included in the distribution. Also, added
104        an explicit "perl" to run Perl scripts from the PrepareRelease script
105        because this is reportedly needed in Windows.
106    
107    
108    Version 8.20 21-Oct-2011
109    ------------------------
110    
111    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
112        a POSIX class. After further experiments with Perl, which convinced me that
113        Perl has bugs and confusions, a closing square bracket is no longer allowed
114        in a POSIX name. This bug also affected patterns with classes that started
115        with full stops.
116    
117    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
118        captured substring, but while checking the failing first alternative,
119        substring 1 is temporarily captured. If the output vector supplied to
120        pcre_exec() was not big enough for this capture, the yield of the function
121        was still zero ("insufficient space for captured substrings"). This cannot
122        be totally fixed without adding another stack variable, which seems a lot
123        of expense for a edge case. However, I have improved the situation in cases
124        such as /(a)(b)x|abc/ matched against "abc", where the return code
125        indicates that fewer than the maximum number of slots in the ovector have
126        been set.
127    
128    3.  Related to (2) above: when there are more back references in a pattern than
129        slots in the output vector, pcre_exec() uses temporary memory during
130        matching, and copies in the captures as far as possible afterwards. It was
131        using the entire output vector, but this conflicts with the specification
132        that only 2/3 is used for passing back captured substrings. Now it uses
133        only the first 2/3, for compatibility. This is, of course, another edge
134        case.
135    
136    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
137        main code base, and can be used by building with --enable-jit. When this is
138        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
139        runtime --no-jit option is given.
140    
141    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
142        ovector, the return from the function was zero, implying that there were
143        other matches that did not fit. The correct "exactly full" value is now
144        returned.
145    
146    6.  If a subpattern that was called recursively or as a subroutine contained
147        (*PRUNE) or any other control that caused it to give a non-standard return,
148        invalid errors such as "Error -26 (nested recursion at the same subject
149        position)" or even infinite loops could occur.
150    
151    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
152        computing the minimum length on reaching *ACCEPT, and so ended up with the
153        wrong value of 1 rather than 0. Further investigation indicates that
154        computing a minimum subject length in the presence of *ACCEPT is difficult
155        (think back references, subroutine calls), and so I have changed the code
156        so that no minimum is registered for a pattern that contains *ACCEPT.
157    
158    8.  If (*THEN) was present in the first (true) branch of a conditional group,
159        it was not handled as intended. [But see 16 below.]
160    
161    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
162        Sheri Pierce.
163    
164    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
165        the first byte in a match must be "a".
166    
167    11. Change 17 for 8.13 increased the recursion depth for patterns like
168        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
169        pattern contains any instances of (*THEN). If it does not, the old
170        optimizations are restored. It would be nice to do this on a per-group
171        basis, but at the moment that is not feasible.
172    
173    12. In some environments, the output of pcretest -C is CRLF terminated. This
174        broke RunTest's code that checks for the link size. A single white space
175        character after the value is now allowed for.
176    
177    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
178        For "fr", it uses the Windows-specific input and output files.
179    
180    14. If (*THEN) appeared in a group that was called recursively or as a
181        subroutine, it did not work as intended. [But see next item.]
182    
183    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
184        pattern fragments (but not containing any | characters). If A and B are
185        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
186        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
187        D. In other words, Perl considers parentheses that do not contain any |
188        characters to be part of a surrounding alternative, whereas PCRE was
189        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
190        differently. PCRE now behaves in the same way as Perl, except in the case
191        of subroutine/recursion calls such as (?1) which have in any case always
192        been different (but PCRE had them first :-).
193    
194    16. Related to 15 above: Perl does not treat the | in a conditional group as
195        creating alternatives. Such a group is treated in the same way as an
196        ordinary group without any | characters when processing (*THEN). PCRE has
197        been changed to match Perl's behaviour.
198    
199    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
200        RunGrepTest script failed.
201    
202    18. Change 22 for version 13 caused atomic groups to use more stack. This is
203        inevitable for groups that contain captures, but it can lead to a lot of
204        stack use in large patterns. The old behaviour has been restored for atomic
205        groups that do not contain any capturing parentheses.
206    
207    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
208        suppress the check for a minimum subject length at run time. (If it was
209        given to pcre_exec() or pcre_dfa_exec() it did work.)
210    
211    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
212        fail to work when decoding hex characters in data strings in EBCDIC
213        environments.
214    
215    21. It appears that in at least one Mac OS environment, the isxdigit() function
216        is implemented as a macro that evaluates to its argument more than once,
217        contravening the C 90 Standard (I haven't checked a later standard). There
218        was an instance in pcretest which caused it to go wrong when processing
219        \x{...} escapes in subject strings. The has been rewritten to avoid using
220        things like p++ in the argument of isxdigit().
221    
222    
223    Version 8.13 16-Aug-2011
224    ------------------------
225    
226    1.  The Unicode data tables have been updated to Unicode 6.0.0.
227    
228    2.  Two minor typos in pcre_internal.h have been fixed.
229    
230    3.  Added #include <string.h> to pcre_scanner_unittest.cc, pcrecpp.cc, and
231        pcrecpp_unittest.cc. They are needed for strcmp(), memset(), and strchr()
232        in some environments (e.g. Solaris 10/SPARC using Sun Studio 12U2).
233    
234    4.  There were a number of related bugs in the code for matching backrefences
235        caselessly in UTF-8 mode when codes for the characters concerned were
236        different numbers of bytes. For example, U+023A and U+2C65 are an upper
237        and lower case pair, using 2 and 3 bytes, respectively. The main bugs were:
238        (a) A reference to 3 copies of a 2-byte code matched only 2 of a 3-byte
239        code. (b) A reference to 2 copies of a 3-byte code would not match 2 of a
240        2-byte code at the end of the subject (it thought there wasn't enough data
241        left).
242    
243    5.  Comprehensive information about what went wrong is now returned by
244        pcre_exec() and pcre_dfa_exec() when the UTF-8 string check fails, as long
245        as the output vector has at least 2 elements. The offset of the start of
246        the failing character and a reason code are placed in the vector.
247    
248    6.  When the UTF-8 string check fails for pcre_compile(), the offset that is
249        now returned is for the first byte of the failing character, instead of the
250        last byte inspected. This is an incompatible change, but I hope it is small
251        enough not to be a problem. It makes the returned offset consistent with
252        pcre_exec() and pcre_dfa_exec().
253    
254    7.  pcretest now gives a text phrase as well as the error number when
255        pcre_exec() or pcre_dfa_exec() fails; if the error is a UTF-8 check
256        failure, the offset and reason code are output.
257    
258    8.  When \R was used with a maximizing quantifier it failed to skip backwards
259        over a \r\n pair if the subsequent match failed. Instead, it just skipped
260        back over a single character (\n). This seems wrong (because it treated the
261        two characters as a single entity when going forwards), conflicts with the
262        documentation that \R is equivalent to (?>\r\n|\n|...etc), and makes the
263        behaviour of \R* different to (\R)*, which also seems wrong. The behaviour
264        has been changed.
265    
266    9.  Some internal refactoring has changed the processing so that the handling
267        of the PCRE_CASELESS and PCRE_MULTILINE options is done entirely at compile
268        time (the PCRE_DOTALL option was changed this way some time ago: version
269        7.7 change 16). This has made it possible to abolish the OP_OPT op code,
270        which was always a bit of a fudge. It also means that there is one less
271        argument for the match() function, which reduces its stack requirements
272        slightly. This change also fixes an incompatibility with Perl: the pattern
273        (?i:([^b]))(?1) should not match "ab", but previously PCRE gave a match.
274    
275    10. More internal refactoring has drastically reduced the number of recursive
276        calls to match() for possessively repeated groups such as (abc)++ when
277        using pcre_exec().
278    
279    11. While implementing 10, a number of bugs in the handling of groups were
280        discovered and fixed:
281    
282        (?<=(a)+) was not diagnosed as invalid (non-fixed-length lookbehind).
283        (a|)*(?1) gave a compile-time internal error.
284        ((a|)+)+  did not notice that the outer group could match an empty string.
285        (^a|^)+   was not marked as anchored.
286        (.*a|.*)+ was not marked as matching at start or after a newline.
287    
288    12. Yet more internal refactoring has removed another argument from the match()
289        function. Special calls to this function are now indicated by setting a
290        value in a variable in the "match data" data block.
291    
292    13. Be more explicit in pcre_study() instead of relying on "default" for
293        opcodes that mean there is no starting character; this means that when new
294        ones are added and accidentally left out of pcre_study(), testing should
295        pick them up.
296    
297    14. The -s option of pcretest has been documented for ages as being an old
298        synonym of -m (show memory usage). I have changed it to mean "force study
299        for every regex", that is, assume /S for every regex. This is similar to -i
300        and -d etc. It's slightly incompatible, but I'm hoping nobody is still
301        using it. It makes it easier to run collections of tests with and without
302        study enabled, and thereby test pcre_study() more easily. All the standard
303        tests are now run with and without -s (but some patterns can be marked as
304        "never study" - see 20 below).
305    
306    15. When (*ACCEPT) was used in a subpattern that was called recursively, the
307        restoration of the capturing data to the outer values was not happening
308        correctly.
309    
310    16. If a recursively called subpattern ended with (*ACCEPT) and matched an
311        empty string, and PCRE_NOTEMPTY was set, pcre_exec() thought the whole
312        pattern had matched an empty string, and so incorrectly returned a no
313        match.
314    
315    17. There was optimizing code for the last branch of non-capturing parentheses,
316        and also for the obeyed branch of a conditional subexpression, which used
317        tail recursion to cut down on stack usage. Unfortunately, now that there is
318        the possibility of (*THEN) occurring in these branches, tail recursion is
319        no longer possible because the return has to be checked for (*THEN). These
320        two optimizations have therefore been removed. [But see 8.20/11 above.]
321    
322    18. If a pattern containing \R was studied, it was assumed that \R always
323        matched two bytes, thus causing the minimum subject length to be
324        incorrectly computed because \R can also match just one byte.
325    
326    19. If a pattern containing (*ACCEPT) was studied, the minimum subject length
327        was incorrectly computed.
328    
329    20. If /S is present twice on a test pattern in pcretest input, it now
330        *disables* studying, thereby overriding the use of -s on the command line
331        (see 14 above). This is necessary for one or two tests to keep the output
332        identical in both cases.
333    
334    21. When (*ACCEPT) was used in an assertion that matched an empty string and
335        PCRE_NOTEMPTY was set, PCRE applied the non-empty test to the assertion.
336    
337    22. When an atomic group that contained a capturing parenthesis was
338        successfully matched, but the branch in which it appeared failed, the
339        capturing was not being forgotten if a higher numbered group was later
340        captured. For example, /(?>(a))b|(a)c/ when matching "ac" set capturing
341        group 1 to "a", when in fact it should be unset. This applied to multi-
342        branched capturing and non-capturing groups, repeated or not, and also to
343        positive assertions (capturing in negative assertions does not happen
344        in PCRE) and also to nested atomic groups.
345    
346    23. Add the ++ qualifier feature to pcretest, to show the remainder of the
347        subject after a captured substring, to make it easier to tell which of a
348        number of identical substrings has been captured.
349    
350    24. The way atomic groups are processed by pcre_exec() has been changed so that
351        if they are repeated, backtracking one repetition now resets captured
352        values correctly. For example, if ((?>(a+)b)+aabab) is matched against
353        "aaaabaaabaabab" the value of captured group 2 is now correctly recorded as
354        "aaa". Previously, it would have been "a". As part of this code
355        refactoring, the way recursive calls are handled has also been changed.
356    
357    25. If an assertion condition captured any substrings, they were not passed
358        back unless some other capturing happened later. For example, if
359        (?(?=(a))a) was matched against "a", no capturing was returned.
360    
361    26. When studying a pattern that contained subroutine calls or assertions,
362        the code for finding the minimum length of a possible match was handling
363        direct recursions such as (xxx(?1)|yyy) but not mutual recursions (where
364        group 1 called group 2 while simultaneously a separate group 2 called group
365        1). A stack overflow occurred in this case. I have fixed this by limiting
366        the recursion depth to 10.
367    
368    27. Updated RunTest.bat in the distribution to the version supplied by Tom
369        Fortmann. This supports explicit test numbers on the command line, and has
370        argument validation and error reporting.
371    
372    28. An instance of \X with an unlimited repeat could fail if at any point the
373        first character it looked at was a mark character.
374    
375    29. Some minor code refactoring concerning Unicode properties and scripts
376        should reduce the stack requirement of match() slightly.
377    
378    30. Added the '=' option to pcretest to check the setting of unused capturing
379        slots at the end of the pattern, which are documented as being -1, but are
380        not included in the return count.
381    
382    31. If \k was not followed by a braced, angle-bracketed, or quoted name, PCRE
383        compiled something random. Now it gives a compile-time error (as does
384        Perl).
385    
386    32. A *MARK encountered during the processing of a positive assertion is now
387        recorded and passed back (compatible with Perl).
388    
389    33. If --only-matching or --colour was set on a pcregrep call whose pattern
390        had alternative anchored branches, the search for a second match in a line
391        was done as if at the line start. Thus, for example, /^01|^02/ incorrectly
392        matched the line "0102" twice. The same bug affected patterns that started
393        with a backwards assertion. For example /\b01|\b02/ also matched "0102"
394        twice.
395    
396    34. Previously, PCRE did not allow quantification of assertions. However, Perl
397        does, and because of capturing effects, quantifying parenthesized
398        assertions may at times be useful. Quantifiers are now allowed for
399        parenthesized assertions.
400    
401    35. A minor code tidy in pcre_compile() when checking options for \R usage.
402    
403    36. \g was being checked for fancy things in a character class, when it should
404        just be a literal "g".
405    
406    37. PCRE was rejecting [:a[:digit:]] whereas Perl was not. It seems that the
407        appearance of a nested POSIX class supersedes an apparent external class.
408        For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
409        unescaped square brackets may also appear as part of class names. For
410        example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
411        more like Perl. (But see 8.20/1 above.)
412    
413    38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
414        was because it thought it was \N{name}, which is not supported).
415    
416    39. Add minix to OS list not supporting the -S option in pcretest.
417    
418    40. PCRE tries to detect cases of infinite recursion at compile time, but it
419        cannot analyze patterns in sufficient detail to catch mutual recursions
420        such as ((?1))((?2)). There is now a runtime test that gives an error if a
421        subgroup is called recursively as a subpattern for a second time at the
422        same position in the subject string. In previous releases this might have
423        been caught by the recursion limit, or it might have run out of stack.
424    
425    41. A pattern such as /(?(R)a+|(?R)b)/ is quite safe, as the recursion can
426        happen only once. PCRE was, however incorrectly giving a compile time error
427        "recursive call could loop indefinitely" because it cannot analyze the
428        pattern in sufficient detail. The compile time test no longer happens when
429        PCRE is compiling a conditional subpattern, but actual runaway loops are
430        now caught at runtime (see 40 above).
431    
432    42. It seems that Perl allows any characters other than a closing parenthesis
433        to be part of the NAME in (*MARK:NAME) and other backtracking verbs. PCRE
434        has been changed to be the same.
435    
436    43. Updated configure.ac to put in more quoting round AC_LANG_PROGRAM etc. so
437        as not to get warnings when autogen.sh is called. Also changed
438        AC_PROG_LIBTOOL (deprecated) to LT_INIT (the current macro).
439    
440    44. To help people who use pcregrep to scan files containing exceedingly long
441        lines, the following changes have been made:
442    
443        (a) The default value of the buffer size parameter has been increased from
444            8K to 20K. (The actual buffer used is three times this size.)
445    
446        (b) The default can be changed by ./configure --with-pcregrep-bufsize when
447            PCRE is built.
448    
449        (c) A --buffer-size=n option has been added to pcregrep, to allow the size
450            to be set at run time.
451    
452        (d) Numerical values in pcregrep options can be followed by K or M, for
453            example --buffer-size=50K.
454    
455        (e) If a line being scanned overflows pcregrep's buffer, an error is now
456            given and the return code is set to 2.
457    
458    45. Add a pointer to the latest mark to the callout data block.
459    
460    46. The pattern /.(*F)/, when applied to "abc" with PCRE_PARTIAL_HARD, gave a
461        partial match of an empty string instead of no match. This was specific to
462        the use of ".".
463    
464    47. The pattern /f.*/8s, when applied to "for" with PCRE_PARTIAL_HARD, gave a
465        complete match instead of a partial match. This bug was dependent on both
466        the PCRE_UTF8 and PCRE_DOTALL options being set.
467    
468    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
469        starting byte set, because \b was not being ignored.
470    
471    
472    Version 8.12 15-Jan-2011
473    ------------------------
474    
475    1.  Fixed some typos in the markup of the man pages, and wrote a script that
476        checks for such things as part of the documentation building process.
477    
478    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
479        --match-limit and --recursion-limit options (added for 8.11). In
480        particular, this made one of the standard tests fail. (The integer value
481        went into the wrong half of a long int.)
482    
483    3.  If the --colour option was given to pcregrep with -v (invert match), it
484        did strange things, either producing crazy output, or crashing. It should,
485        of course, ignore a request for colour when reporting lines that do not
486        match.
487    
488    4.  Another pcregrep bug caused similar problems if --colour was specified with
489        -M (multiline) and the pattern match finished with a line ending.
490    
491    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
492        matched in multiline mode, the following line was shown as part of the
493        match. This seems wrong, so I have changed it.
494    
495    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
496        the check for further matches in the same line (so they could be coloured)
497        to overrun the end of the current line. If another match was found, it was
498        incorrectly shown (and then shown again when found in the next line).
499    
500    7.  If pcregrep was compiled under Windows, there was a reference to the
501        function pcregrep_exit() before it was defined. I am assuming this was
502        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
503        reported by a user. I've moved the definition above the reference.
504    
505    
506    Version 8.11 10-Dec-2010
507    ------------------------
508    
509    1.  (*THEN) was not working properly if there were untried alternatives prior
510        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
511        backtracked to try for "b" instead of moving to the next alternative branch
512        at the same level (in this case, to look for "c"). The Perl documentation
513        is clear that when (*THEN) is backtracked onto, it goes to the "next
514        alternative in the innermost enclosing group".
515    
516    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
517        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
518        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
519        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
520        (*THEN).
521    
522    3.  If \s appeared in a character class, it removed the VT character from
523        the class, even if it had been included by some previous item, for example
524        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
525        of \s, but is part of the POSIX "space" class.)
526    
527    4.  A partial match never returns an empty string (because you can always
528        match an empty string at the end of the subject); however the checking for
529        an empty string was starting at the "start of match" point. This has been
530        changed to the "earliest inspected character" point, because the returned
531        data for a partial match starts at this character. This means that, for
532        example, /(?<=abc)def/ gives a partial match for the subject "abc"
533        (previously it gave "no match").
534    
535    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
536        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
537        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
538        has an implication that the given string is incomplete (because a partial
539        match is preferred over a full match). For this reason, these items now
540        give a partial match in this situation. [Aside: previously, the one case
541        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
542        match rather than a full match, which was wrong by the old rules, but is
543        now correct.]
544    
545    6.  There was a bug in the handling of #-introduced comments, recognized when
546        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
547        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
548        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
549        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
550        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
551        places in pcre_compile().
552    
553    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
554        comments when looking ahead for named forward references to subpatterns,
555        the only newline sequence it recognized was NL. It now handles newlines
556        according to the set newline convention.
557    
558    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
559        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
560        cater for a lack of strerror(). These oversights have been fixed.
561    
562    9.  Added --match-limit and --recursion-limit to pcregrep.
563    
564    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
565    
566    11. When the -o option was used, pcregrep was setting a return code of 1, even
567        when matches were found, and --line-buffered was not being honoured.
568    
569    12. Added an optional parentheses number to the -o and --only-matching options
570        of pcregrep.
571    
572    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
573        can match an empty string. The code to do it in pcretest and pcredemo
574        needed fixing:
575    
576        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
577            only one byte after an empty string match just before CRLF (this case
578            just got forgotten; "any" and "anycrlf" were OK).
579    
580        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
581            mode when an empty string match preceded an ASCII character followed by
582            a non-ASCII character. (The code for advancing by one character rather
583            than one byte was nonsense.)
584    
585        (c) The pcredemo.c sample program did not have any code at all to handle
586            the cases when CRLF is a valid newline sequence.
587    
588    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
589        as a starting offset was within the subject string. There is now a new
590        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
591        negative or greater than the length of the string. In order to test this,
592        pcretest is extended to allow the setting of negative starting offsets.
593    
594    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
595        starting offset points to the beginning of a UTF-8 character was
596        unnecessarily clumsy. I tidied it up.
597    
598    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
599        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
600    
601    17. Nobody had reported that the --include_dir option, which was added in
602        release 7.7 should have been called --include-dir (hyphen, not underscore)
603        for compatibility with GNU grep. I have changed it to --include-dir, but
604        left --include_dir as an undocumented synonym, and the same for
605        --exclude-dir, though that is not available in GNU grep, at least as of
606        release 2.5.4.
607    
608    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
609        characters from a string of bytes) have been redefined so as not to use
610        loops, in order to improve performance in some environments. At the same
611        time, I abstracted some of the common code into auxiliary macros to save
612        repetition (this should not affect the compiled code).
613    
614    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
615        compile-time error is now given if \c is not followed by an ASCII
616        character, that is, a byte less than 128. (In EBCDIC mode, the code is
617        different, and any byte value is allowed.)
618    
619    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
620        START_OPTIMIZE option, which is now allowed at compile time - but just
621        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
622        to pcregrep and other applications that have no direct access to PCRE
623        options. The new /Y option in pcretest sets this option when calling
624        pcre_compile().
625    
626    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
627        back references. Groups containing recursive back references were forced to
628        be atomic by that change, but in the case of named groups, the amount of
629        memory required was incorrectly computed, leading to "Failed: internal
630        error: code overflow". This has been fixed.
631    
632    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
633        pcretest.c, to avoid build problems in some Borland environments.
634    
635    
636    Version 8.10 25-Jun-2010
637    ------------------------
638    
639    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
640        THEN.
641    
642    2.  (*ACCEPT) was not working when inside an atomic group.
643    
644    3.  Inside a character class, \B is treated as a literal by default, but
645        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
646        causes the error). The code is unchanged, but I tidied the documentation.
647    
648    4.  Inside a character class, PCRE always treated \R and \X as literals,
649        whereas Perl faults them if its -w option is set. I have changed PCRE so
650        that it faults them when PCRE_EXTRA is set.
651    
652    5.  Added support for \N, which always matches any character other than
653        newline. (It is the same as "." when PCRE_DOTALL is not set.)
654    
655    6.  When compiling pcregrep with newer versions of gcc which may have
656        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
657        declared with attribute warn_unused_result" were given. Just casting the
658        result to (void) does not stop the warnings; a more elaborate fudge is
659        needed. I've used a macro to implement this.
660    
661    7.  Minor change to pcretest.c to avoid a compiler warning.
662    
663    8.  Added four artifical Unicode properties to help with an option to make
664        \s etc use properties (see next item). The new properties are: Xan
665        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
666    
667    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
668        use Unicode properties. (*UCP) at the start of a pattern can be used to set
669        this option. Modified pcretest to add /W to test this facility. Added
670        REG_UCP to make it available via the POSIX interface.
671    
672    10. Added --line-buffered to pcregrep.
673    
674    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
675        studied, and the match started with a letter with a code point greater than
676        127 whose first byte was different to the first byte of the other case of
677        the letter, the other case of this starting letter was not recognized
678        (#976).
679    
680    12. If a pattern that was studied started with a repeated Unicode property
681        test, for example, \p{Nd}+, there was the theoretical possibility of
682        setting up an incorrect bitmap of starting bytes, but fortunately it could
683        not have actually happened in practice until change 8 above was made (it
684        added property types that matched character-matching opcodes).
685    
686    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
687        possible starting bytes for non-anchored patterns.
688    
689    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
690        \R, and also a number of cases that involve Unicode properties, both
691        explicit and implicit when PCRE_UCP is set.
692    
693    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
694        input, it could crash or give wrong results if characters with values
695        greater than 0xc0 were present in the subject string. (Detail: it assumed
696        UTF-8 input when processing these items.)
697    
698    16. Added a lot of (int) casts to avoid compiler warnings in systems where
699        size_t is 64-bit (#991).
700    
701    17. Added a check for running out of memory when PCRE is compiled with
702        --disable-stack-for-recursion (#990).
703    
704    18. If the last data line in a file for pcretest does not have a newline on
705        the end, a newline was missing in the output.
706    
707    19. The default pcre_chartables.c file recognizes only ASCII characters (values
708        less than 128) in its various bitmaps. However, there is a facility for
709        generating tables according to the current locale when PCRE is compiled. It
710        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
711        characters, are recognized by isspace() and therefore were getting set in
712        these tables, and indeed these tables seem to approximate to ISO 8859. This
713        caused a problem in UTF-8 mode when pcre_study() was used to create a list
714        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
715        which of course cannot start UTF-8 characters. I have changed the code so
716        that only real ASCII characters (less than 128) and the correct starting
717        bytes for UTF-8 encodings are set for characters greater than 127 when in
718        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
719        altogether.)
720    
721    20. Added the /T option to pcretest so as to be able to run tests with non-
722        standard character tables, thus making it possible to include the tests
723        used for 19 above in the standard set of tests.
724    
725    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
726        reference to a subpattern the other side of a comment that contains an
727        opening parenthesis caused either an internal compiling error, or a
728        reference to the wrong subpattern.
729    
730    
731    Version 8.02 19-Mar-2010
732  ------------------------  ------------------------
733    
734  1.  The Unicode data tables have been updated to Unicode 5.2.0.  1.  The Unicode data tables have been updated to Unicode 5.2.0.
735    
736  2.  Added the option --libs-cpp to pcre-config, but only when C++ support is  2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
737      configured.      configured.
738    
739  3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the  3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
740      original author of that file, following a query about its status.      original author of that file, following a query about its status.
741    
742  4.  On systems that do not have stdint.h (e.g. Solaris), check for and include  4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
743      inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.      inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
744    
745  5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive  5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
746      quantifier applied to a forward-referencing subroutine call, could compile      quantifier applied to a forward-referencing subroutine call, could compile
747      incorrect code or give the error "internal error: previously-checked      incorrect code or give the error "internal error: previously-checked
748      referenced subpattern not found".      referenced subpattern not found".
749    
750  6.  Both MS Visual Studio and Symbian OS have problems with initializing  6.  Both MS Visual Studio and Symbian OS have problems with initializing
751      variables to point to external functions. For these systems, therefore,      variables to point to external functions. For these systems, therefore,
752      pcre_malloc etc. are now initialized to local functions that call the      pcre_malloc etc. are now initialized to local functions that call the
753      relevant global functions.      relevant global functions.
754    
755  7.  There were two entries missing in the vectors called coptable and poptable  7.  There were two entries missing in the vectors called coptable and poptable
756      in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.      in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
757      I've fixed the data, and added a kludgy way of testing at compile time that      I've fixed the data, and added a kludgy way of testing at compile time that
758      the lengths are correct (equal to the number of opcodes).      the lengths are correct (equal to the number of opcodes).
759    
760  8.  Following on from 7, I added a similar kludge to check the length of the  8.  Following on from 7, I added a similar kludge to check the length of the
761      eint vector in pcreposix.c.      eint vector in pcreposix.c.
762    
763  9.  Error texts for pcre_compile() are held as one long string to avoid too  9.  Error texts for pcre_compile() are held as one long string to avoid too
764      much relocation at load time. To find a text, the string is searched,      much relocation at load time. To find a text, the string is searched,
765      counting zeros. There was no check for running off the end of the string,      counting zeros. There was no check for running off the end of the string,
766      which could happen if a new error number was added without updating the      which could happen if a new error number was added without updating the
767      string.      string.
768    
769  10. \K gave a compile-time error if it appeared in a lookbehind assersion.  10. \K gave a compile-time error if it appeared in a lookbehind assersion.
770    
771  11. \K was not working if it appeared in an atomic group or in a group that  11. \K was not working if it appeared in an atomic group or in a group that
772      was called as a "subroutine", or in an assertion. Perl 5.11 documents that      was called as a "subroutine", or in an assertion. Perl 5.11 documents that
773      \K is "not well defined" if used in an assertion. PCRE now accepts it if      \K is "not well defined" if used in an assertion. PCRE now accepts it if
774      the assertion is positive, but not if it is negative.      the assertion is positive, but not if it is negative.
775    
776  12. Change 11 fortuitously reduced the size of the stack frame used in the  12. Change 11 fortuitously reduced the size of the stack frame used in the
777      "match()" function of pcre_exec.c by one pointer. Forthcoming      "match()" function of pcre_exec.c by one pointer. Forthcoming
778      implementation of support for (*MARK) will need an extra pointer on the      implementation of support for (*MARK) will need an extra pointer on the
779      stack; I have reserved it now, so that the stack frame size does not      stack; I have reserved it now, so that the stack frame size does not
780      decrease.      decrease.
781    
782  13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other  13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
783      item in branch that calls a recursion is a subroutine call - as in the      item in branch that calls a recursion is a subroutine call - as in the
784      second branch in the above example - was incorrectly given the compile-      second branch in the above example - was incorrectly given the compile-
785      time error "recursive call could loop indefinitely" because pcre_compile()      time error "recursive call could loop indefinitely" because pcre_compile()
786      was not correctly checking the subroutine for matching a non-empty string.      was not correctly checking the subroutine for matching a non-empty string.
787    
788  14. The checks for overrunning compiling workspace could trigger after an  14. The checks for overrunning compiling workspace could trigger after an
789      overrun had occurred. This is a "should never occur" error, but it can be      overrun had occurred. This is a "should never occur" error, but it can be
790      triggered by pathological patterns such as hundreds of nested parentheses.      triggered by pathological patterns such as hundreds of nested parentheses.
791      The checks now trigger 100 bytes before the end of the workspace.      The checks now trigger 100 bytes before the end of the workspace.
792    
793    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
794    
795    
796  Version 8.01 19-Jan-2010  Version 8.01 19-Jan-2010

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