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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.1 12-Mar-07  Version 8.13 30-Apr-2011
5    ------------------------
6    
7    1.  The Unicode data tables have been updated to Unicode 6.0.0.
8    
9    2.  Two minor typos in pcre_internal.h have been fixed.
10    
11    
12    Version 8.12 15-Jan-2011
13    ------------------------
14    
15    1.  Fixed some typos in the markup of the man pages, and wrote a script that
16        checks for such things as part of the documentation building process.
17    
18    2.  On a big-endian 64-bit system, pcregrep did not correctly process the
19        --match-limit and --recursion-limit options (added for 8.11). In
20        particular, this made one of the standard tests fail. (The integer value
21        went into the wrong half of a long int.)
22    
23    3.  If the --colour option was given to pcregrep with -v (invert match), it
24        did strange things, either producing crazy output, or crashing. It should,
25        of course, ignore a request for colour when reporting lines that do not
26        match.
27    
28    4.  Another pcregrep bug caused similar problems if --colour was specified with
29        -M (multiline) and the pattern match finished with a line ending.
30    
31    5.  In pcregrep, when a pattern that ended with a literal newline sequence was
32        matched in multiline mode, the following line was shown as part of the
33        match. This seems wrong, so I have changed it.
34    
35    6.  Another pcregrep bug in multiline mode, when --colour was specified, caused
36        the check for further matches in the same line (so they could be coloured)
37        to overrun the end of the current line. If another match was found, it was
38        incorrectly shown (and then shown again when found in the next line).
39    
40    7.  If pcregrep was compiled under Windows, there was a reference to the
41        function pcregrep_exit() before it was defined. I am assuming this was
42        the cause of the "error C2371: 'pcregrep_exit' : redefinition;" that was
43        reported by a user. I've moved the definition above the reference.
44    
45    
46    Version 8.11 10-Dec-2010
47    ------------------------
48    
49    1.  (*THEN) was not working properly if there were untried alternatives prior
50        to it in the current branch. For example, in ((a|b)(*THEN)(*F)|c..) it
51        backtracked to try for "b" instead of moving to the next alternative branch
52        at the same level (in this case, to look for "c"). The Perl documentation
53        is clear that when (*THEN) is backtracked onto, it goes to the "next
54        alternative in the innermost enclosing group".
55    
56    2.  (*COMMIT) was not overriding (*THEN), as it does in Perl. In a pattern
57        such as   (A(*COMMIT)B(*THEN)C|D)  any failure after matching A should
58        result in overall failure. Similarly, (*COMMIT) now overrides (*PRUNE) and
59        (*SKIP), (*SKIP) overrides (*PRUNE) and (*THEN), and (*PRUNE) overrides
60        (*THEN).
61    
62    3.  If \s appeared in a character class, it removed the VT character from
63        the class, even if it had been included by some previous item, for example
64        in [\x00-\xff\s]. (This was a bug related to the fact that VT is not part
65        of \s, but is part of the POSIX "space" class.)
66    
67    4.  A partial match never returns an empty string (because you can always
68        match an empty string at the end of the subject); however the checking for
69        an empty string was starting at the "start of match" point. This has been
70        changed to the "earliest inspected character" point, because the returned
71        data for a partial match starts at this character. This means that, for
72        example, /(?<=abc)def/ gives a partial match for the subject "abc"
73        (previously it gave "no match").
74    
75    5.  Changes have been made to the way PCRE_PARTIAL_HARD affects the matching
76        of $, \z, \Z, \b, and \B. If the match point is at the end of the string,
77        previously a full match would be given. However, setting PCRE_PARTIAL_HARD
78        has an implication that the given string is incomplete (because a partial
79        match is preferred over a full match). For this reason, these items now
80        give a partial match in this situation. [Aside: previously, the one case
81        /t\b/ matched against "cat" with PCRE_PARTIAL_HARD set did return a partial
82        match rather than a full match, which was wrong by the old rules, but is
83        now correct.]
84    
85    6.  There was a bug in the handling of #-introduced comments, recognized when
86        PCRE_EXTENDED is set, when PCRE_NEWLINE_ANY and PCRE_UTF8 were also set.
87        If a UTF-8 multi-byte character included the byte 0x85 (e.g. +U0445, whose
88        UTF-8 encoding is 0xd1,0x85), this was misinterpreted as a newline when
89        scanning for the end of the comment. (*Character* 0x85 is an "any" newline,
90        but *byte* 0x85 is not, in UTF-8 mode). This bug was present in several
91        places in pcre_compile().
92    
93    7.  Related to (6) above, when pcre_compile() was skipping #-introduced
94        comments when looking ahead for named forward references to subpatterns,
95        the only newline sequence it recognized was NL. It now handles newlines
96        according to the set newline convention.
97    
98    8.  SunOS4 doesn't have strerror() or strtoul(); pcregrep dealt with the
99        former, but used strtoul(), whereas pcretest avoided strtoul() but did not
100        cater for a lack of strerror(). These oversights have been fixed.
101    
102    9.  Added --match-limit and --recursion-limit to pcregrep.
103    
104    10. Added two casts needed to build with Visual Studio when NO_RECURSE is set.
105    
106    11. When the -o option was used, pcregrep was setting a return code of 1, even
107        when matches were found, and --line-buffered was not being honoured.
108    
109    12. Added an optional parentheses number to the -o and --only-matching options
110        of pcregrep.
111    
112    13. Imitating Perl's /g action for multiple matches is tricky when the pattern
113        can match an empty string. The code to do it in pcretest and pcredemo
114        needed fixing:
115    
116        (a) When the newline convention was "crlf", pcretest got it wrong, skipping
117            only one byte after an empty string match just before CRLF (this case
118            just got forgotten; "any" and "anycrlf" were OK).
119    
120        (b) The pcretest code also had a bug, causing it to loop forever in UTF-8
121            mode when an empty string match preceded an ASCII character followed by
122            a non-ASCII character. (The code for advancing by one character rather
123            than one byte was nonsense.)
124    
125        (c) The pcredemo.c sample program did not have any code at all to handle
126            the cases when CRLF is a valid newline sequence.
127    
128    14. Neither pcre_exec() nor pcre_dfa_exec() was checking that the value given
129        as a starting offset was within the subject string. There is now a new
130        error, PCRE_ERROR_BADOFFSET, which is returned if the starting offset is
131        negative or greater than the length of the string. In order to test this,
132        pcretest is extended to allow the setting of negative starting offsets.
133    
134    15. In both pcre_exec() and pcre_dfa_exec() the code for checking that the
135        starting offset points to the beginning of a UTF-8 character was
136        unnecessarily clumsy. I tidied it up.
137    
138    16. Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
139        bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
140    
141    17. Nobody had reported that the --include_dir option, which was added in
142        release 7.7 should have been called --include-dir (hyphen, not underscore)
143        for compatibility with GNU grep. I have changed it to --include-dir, but
144        left --include_dir as an undocumented synonym, and the same for
145        --exclude-dir, though that is not available in GNU grep, at least as of
146        release 2.5.4.
147    
148    18. At a user's suggestion, the macros GETCHAR and friends (which pick up UTF-8
149        characters from a string of bytes) have been redefined so as not to use
150        loops, in order to improve performance in some environments. At the same
151        time, I abstracted some of the common code into auxiliary macros to save
152        repetition (this should not affect the compiled code).
153    
154    19. If \c was followed by a multibyte UTF-8 character, bad things happened. A
155        compile-time error is now given if \c is not followed by an ASCII
156        character, that is, a byte less than 128. (In EBCDIC mode, the code is
157        different, and any byte value is allowed.)
158    
159    20. Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
160        START_OPTIMIZE option, which is now allowed at compile time - but just
161        passed through to pcre_exec() or pcre_dfa_exec(). This makes it available
162        to pcregrep and other applications that have no direct access to PCRE
163        options. The new /Y option in pcretest sets this option when calling
164        pcre_compile().
165    
166    21. Change 18 of release 8.01 broke the use of named subpatterns for recursive
167        back references. Groups containing recursive back references were forced to
168        be atomic by that change, but in the case of named groups, the amount of
169        memory required was incorrectly computed, leading to "Failed: internal
170        error: code overflow". This has been fixed.
171    
172    22. Some patches to pcre_stringpiece.h, pcre_stringpiece_unittest.cc, and
173        pcretest.c, to avoid build problems in some Borland environments.
174    
175    
176    Version 8.10 25-Jun-2010
177    ------------------------
178    
179    1.  Added support for (*MARK:ARG) and for ARG additions to PRUNE, SKIP, and
180        THEN.
181    
182    2.  (*ACCEPT) was not working when inside an atomic group.
183    
184    3.  Inside a character class, \B is treated as a literal by default, but
185        faulted if PCRE_EXTRA is set. This mimics Perl's behaviour (the -w option
186        causes the error). The code is unchanged, but I tidied the documentation.
187    
188    4.  Inside a character class, PCRE always treated \R and \X as literals,
189        whereas Perl faults them if its -w option is set. I have changed PCRE so
190        that it faults them when PCRE_EXTRA is set.
191    
192    5.  Added support for \N, which always matches any character other than
193        newline. (It is the same as "." when PCRE_DOTALL is not set.)
194    
195    6.  When compiling pcregrep with newer versions of gcc which may have
196        FORTIFY_SOURCE set, several warnings "ignoring return value of 'fwrite',
197        declared with attribute warn_unused_result" were given. Just casting the
198        result to (void) does not stop the warnings; a more elaborate fudge is
199        needed. I've used a macro to implement this.
200    
201    7.  Minor change to pcretest.c to avoid a compiler warning.
202    
203    8.  Added four artifical Unicode properties to help with an option to make
204        \s etc use properties (see next item). The new properties are: Xan
205        (alphanumeric), Xsp (Perl space), Xps (POSIX space), and Xwd (word).
206    
207    9.  Added PCRE_UCP to make \b, \d, \s, \w, and certain POSIX character classes
208        use Unicode properties. (*UCP) at the start of a pattern can be used to set
209        this option. Modified pcretest to add /W to test this facility. Added
210        REG_UCP to make it available via the POSIX interface.
211    
212    10. Added --line-buffered to pcregrep.
213    
214    11. In UTF-8 mode, if a pattern that was compiled with PCRE_CASELESS was
215        studied, and the match started with a letter with a code point greater than
216        127 whose first byte was different to the first byte of the other case of
217        the letter, the other case of this starting letter was not recognized
218        (#976).
219    
220    12. If a pattern that was studied started with a repeated Unicode property
221        test, for example, \p{Nd}+, there was the theoretical possibility of
222        setting up an incorrect bitmap of starting bytes, but fortunately it could
223        not have actually happened in practice until change 8 above was made (it
224        added property types that matched character-matching opcodes).
225    
226    13. pcre_study() now recognizes \h, \v, and \R when constructing a bit map of
227        possible starting bytes for non-anchored patterns.
228    
229    14. Extended the "auto-possessify" feature of pcre_compile(). It now recognizes
230        \R, and also a number of cases that involve Unicode properties, both
231        explicit and implicit when PCRE_UCP is set.
232    
233    15. If a repeated Unicode property match (e.g. \p{Lu}*) was used with non-UTF-8
234        input, it could crash or give wrong results if characters with values
235        greater than 0xc0 were present in the subject string. (Detail: it assumed
236        UTF-8 input when processing these items.)
237    
238    16. Added a lot of (int) casts to avoid compiler warnings in systems where
239        size_t is 64-bit (#991).
240    
241    17. Added a check for running out of memory when PCRE is compiled with
242        --disable-stack-for-recursion (#990).
243    
244    18. If the last data line in a file for pcretest does not have a newline on
245        the end, a newline was missing in the output.
246    
247    19. The default pcre_chartables.c file recognizes only ASCII characters (values
248        less than 128) in its various bitmaps. However, there is a facility for
249        generating tables according to the current locale when PCRE is compiled. It
250        turns out that in some environments, 0x85 and 0xa0, which are Unicode space
251        characters, are recognized by isspace() and therefore were getting set in
252        these tables, and indeed these tables seem to approximate to ISO 8859. This
253        caused a problem in UTF-8 mode when pcre_study() was used to create a list
254        of bytes that can start a match. For \s, it was including 0x85 and 0xa0,
255        which of course cannot start UTF-8 characters. I have changed the code so
256        that only real ASCII characters (less than 128) and the correct starting
257        bytes for UTF-8 encodings are set for characters greater than 127 when in
258        UTF-8 mode. (When PCRE_UCP is set - see 9 above - the code is different
259        altogether.)
260    
261    20. Added the /T option to pcretest so as to be able to run tests with non-
262        standard character tables, thus making it possible to include the tests
263        used for 19 above in the standard set of tests.
264    
265    21. A pattern such as (?&t)(?#()(?(DEFINE)(?<t>a)) which has a forward
266        reference to a subpattern the other side of a comment that contains an
267        opening parenthesis caused either an internal compiling error, or a
268        reference to the wrong subpattern.
269    
270    
271    Version 8.02 19-Mar-2010
272    ------------------------
273    
274    1.  The Unicode data tables have been updated to Unicode 5.2.0.
275    
276    2.  Added the option --libs-cpp to pcre-config, but only when C++ support is
277        configured.
278    
279    3.  Updated the licensing terms in the pcregexp.pas file, as agreed with the
280        original author of that file, following a query about its status.
281    
282    4.  On systems that do not have stdint.h (e.g. Solaris), check for and include
283        inttypes.h instead. This fixes a bug that was introduced by change 8.01/8.
284    
285    5.  A pattern such as (?&t)*+(?(DEFINE)(?<t>.)) which has a possessive
286        quantifier applied to a forward-referencing subroutine call, could compile
287        incorrect code or give the error "internal error: previously-checked
288        referenced subpattern not found".
289    
290    6.  Both MS Visual Studio and Symbian OS have problems with initializing
291        variables to point to external functions. For these systems, therefore,
292        pcre_malloc etc. are now initialized to local functions that call the
293        relevant global functions.
294    
295    7.  There were two entries missing in the vectors called coptable and poptable
296        in pcre_dfa_exec.c. This could lead to memory accesses outsize the vectors.
297        I've fixed the data, and added a kludgy way of testing at compile time that
298        the lengths are correct (equal to the number of opcodes).
299    
300    8.  Following on from 7, I added a similar kludge to check the length of the
301        eint vector in pcreposix.c.
302    
303    9.  Error texts for pcre_compile() are held as one long string to avoid too
304        much relocation at load time. To find a text, the string is searched,
305        counting zeros. There was no check for running off the end of the string,
306        which could happen if a new error number was added without updating the
307        string.
308    
309    10. \K gave a compile-time error if it appeared in a lookbehind assersion.
310    
311    11. \K was not working if it appeared in an atomic group or in a group that
312        was called as a "subroutine", or in an assertion. Perl 5.11 documents that
313        \K is "not well defined" if used in an assertion. PCRE now accepts it if
314        the assertion is positive, but not if it is negative.
315    
316    12. Change 11 fortuitously reduced the size of the stack frame used in the
317        "match()" function of pcre_exec.c by one pointer. Forthcoming
318        implementation of support for (*MARK) will need an extra pointer on the
319        stack; I have reserved it now, so that the stack frame size does not
320        decrease.
321    
322    13. A pattern such as (?P<L1>(?P<L2>0)|(?P>L2)(?P>L1)) in which the only other
323        item in branch that calls a recursion is a subroutine call - as in the
324        second branch in the above example - was incorrectly given the compile-
325        time error "recursive call could loop indefinitely" because pcre_compile()
326        was not correctly checking the subroutine for matching a non-empty string.
327    
328    14. The checks for overrunning compiling workspace could trigger after an
329        overrun had occurred. This is a "should never occur" error, but it can be
330        triggered by pathological patterns such as hundreds of nested parentheses.
331        The checks now trigger 100 bytes before the end of the workspace.
332    
333    15. Fix typo in configure.ac: "srtoq" should be "strtoq".
334    
335    
336    Version 8.01 19-Jan-2010
337    ------------------------
338    
339    1.  If a pattern contained a conditional subpattern with only one branch (in
340        particular, this includes all (*DEFINE) patterns), a call to pcre_study()
341        computed the wrong minimum data length (which is of course zero for such
342        subpatterns). This could cause incorrect "no match" results.
343    
344    2.  For patterns such as (?i)a(?-i)b|c where an option setting at the start of
345        the pattern is reset in the first branch, pcre_compile() failed with
346        "internal error: code overflow at offset...". This happened only when
347        the reset was to the original external option setting. (An optimization
348        abstracts leading options settings into an external setting, which was the
349        cause of this.)
350    
351    3.  A pattern such as ^(?!a(*SKIP)b) where a negative assertion contained one
352        of the verbs SKIP, PRUNE, or COMMIT, did not work correctly. When the
353        assertion pattern did not match (meaning that the assertion was true), it
354        was incorrectly treated as false if the SKIP had been reached during the
355        matching. This also applied to assertions used as conditions.
356    
357    4.  If an item that is not supported by pcre_dfa_exec() was encountered in an
358        assertion subpattern, including such a pattern used as a condition,
359        unpredictable results occurred, instead of the error return
360        PCRE_ERROR_DFA_UITEM.
361    
362    5.  The C++ GlobalReplace function was not working like Perl for the special
363        situation when an empty string is matched. It now does the fancy magic
364        stuff that is necessary.
365    
366    6.  In pcre_internal.h, obsolete includes to setjmp.h and stdarg.h have been
367        removed. (These were left over from very, very early versions of PCRE.)
368    
369    7.  Some cosmetic changes to the code to make life easier when compiling it
370        as part of something else:
371    
372        (a) Change DEBUG to PCRE_DEBUG.
373    
374        (b) In pcre_compile(), rename the member of the "branch_chain" structure
375            called "current" as "current_branch", to prevent a collision with the
376            Linux macro when compiled as a kernel module.
377    
378        (c) In pcre_study(), rename the function set_bit() as set_table_bit(), to
379            prevent a collision with the Linux macro when compiled as a kernel
380            module.
381    
382    8.  In pcre_compile() there are some checks for integer overflows that used to
383        cast potentially large values to (double). This has been changed to that
384        when building, a check for int64_t is made, and if it is found, it is used
385        instead, thus avoiding the use of floating point arithmetic. (There is no
386        other use of FP in PCRE.) If int64_t is not found, the fallback is to
387        double.
388    
389    9.  Added two casts to avoid signed/unsigned warnings from VS Studio Express
390        2005 (difference between two addresses compared to an unsigned value).
391    
392    10. Change the standard AC_CHECK_LIB test for libbz2 in configure.ac to a
393        custom one, because of the following reported problem in Windows:
394    
395          - libbz2 uses the Pascal calling convention (WINAPI) for the functions
396              under Win32.
397          - The standard autoconf AC_CHECK_LIB fails to include "bzlib.h",
398              therefore missing the function definition.
399          - The compiler thus generates a "C" signature for the test function.
400          - The linker fails to find the "C" function.
401          - PCRE fails to configure if asked to do so against libbz2.
402    
403    11. When running libtoolize from libtool-2.2.6b as part of autogen.sh, these
404        messages were output:
405    
406          Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.ac and
407          rerunning libtoolize, to keep the correct libtool macros in-tree.
408          Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
409    
410        I have done both of these things.
411    
412    12. Although pcre_dfa_exec() does not use nearly as much stack as pcre_exec()
413        most of the time, it *can* run out if it is given a pattern that contains a
414        runaway infinite recursion. I updated the discussion in the pcrestack man
415        page.
416    
417    13. Now that we have gone to the x.xx style of version numbers, the minor
418        version may start with zero. Using 08 or 09 is a bad idea because users
419        might check the value of PCRE_MINOR in their code, and 08 or 09 may be
420        interpreted as invalid octal numbers. I've updated the previous comment in
421        configure.ac, and also added a check that gives an error if 08 or 09 are
422        used.
423    
424    14. Change 8.00/11 was not quite complete: code had been accidentally omitted,
425        causing partial matching to fail when the end of the subject matched \W
426        in a UTF-8 pattern where \W was quantified with a minimum of 3.
427    
428    15. There were some discrepancies between the declarations in pcre_internal.h
429        of _pcre_is_newline(), _pcre_was_newline(), and _pcre_valid_utf8() and
430        their definitions. The declarations used "const uschar *" and the
431        definitions used USPTR. Even though USPTR is normally defined as "const
432        unsigned char *" (and uschar is typedeffed as "unsigned char"), it was
433        reported that: "This difference in casting confuses some C++ compilers, for
434        example, SunCC recognizes above declarations as different functions and
435        generates broken code for hbpcre." I have changed the declarations to use
436        USPTR.
437    
438    16. GNU libtool is named differently on some systems. The autogen.sh script now
439        tries several variants such as glibtoolize (MacOSX) and libtoolize1x
440        (FreeBSD).
441    
442    17. Applied Craig's patch that fixes an HP aCC compile error in pcre 8.00
443        (strtoXX undefined when compiling pcrecpp.cc). The patch contains this
444        comment: "Figure out how to create a longlong from a string: strtoll and
445        equivalent. It's not enough to call AC_CHECK_FUNCS: hpux has a strtoll, for
446        instance, but it only takes 2 args instead of 3!"
447    
448    18. A subtle bug concerned with back references has been fixed by a change of
449        specification, with a corresponding code fix. A pattern such as
450        ^(xa|=?\1a)+$ which contains a back reference inside the group to which it
451        refers, was giving matches when it shouldn't. For example, xa=xaaa would
452        match that pattern. Interestingly, Perl (at least up to 5.11.3) has the
453        same bug. Such groups have to be quantified to be useful, or contained
454        inside another quantified group. (If there's no repetition, the reference
455        can never match.) The problem arises because, having left the group and
456        moved on to the rest of the pattern, a later failure that backtracks into
457        the group uses the captured value from the final iteration of the group
458        rather than the correct earlier one. I have fixed this in PCRE by forcing
459        any group that contains a reference to itself to be an atomic group; that
460        is, there cannot be any backtracking into it once it has completed. This is
461        similar to recursive and subroutine calls.
462    
463    
464    Version 8.00 19-Oct-09
465    ----------------------
466    
467    1.  The table for translating pcre_compile() error codes into POSIX error codes
468        was out-of-date, and there was no check on the pcre_compile() error code
469        being within the table. This could lead to an OK return being given in
470        error.
471    
472    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
473        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
474        in a Windows environment.
475    
476    3.  The pcregrep --count option prints the count for each file even when it is
477        zero, as does GNU grep. However, pcregrep was also printing all files when
478        --files-with-matches was added. Now, when both options are given, it prints
479        counts only for those files that have at least one match. (GNU grep just
480        prints the file name in this circumstance, but including the count seems
481        more useful - otherwise, why use --count?) Also ensured that the
482        combination -clh just lists non-zero counts, with no names.
483    
484    4.  The long form of the pcregrep -F option was incorrectly implemented as
485        --fixed_strings instead of --fixed-strings. This is an incompatible change,
486        but it seems right to fix it, and I didn't think it was worth preserving
487        the old behaviour.
488    
489    5.  The command line items --regex=pattern and --regexp=pattern were not
490        recognized by pcregrep, which required --regex pattern or --regexp pattern
491        (with a space rather than an '='). The man page documented the '=' forms,
492        which are compatible with GNU grep; these now work.
493    
494    6.  No libpcreposix.pc file was created for pkg-config; there was just
495        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
496    
497    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
498        when UCP support is not needed, by modifying the Python script that
499        generates it from Unicode data files. This should not matter if the module
500        is correctly used as a library, but I received one complaint about 50K of
501        unwanted data. My guess is that the person linked everything into his
502        program rather than using a library. Anyway, it does no harm.
503    
504    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
505        was a minimum greater than 1 for a wide character in a possessive
506        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
507        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
508        character. Chaos in the form of incorrect output or a compiling loop could
509        result.
510    
511    9.  The restrictions on what a pattern can contain when partial matching is
512        requested for pcre_exec() have been removed. All patterns can now be
513        partially matched by this function. In addition, if there are at least two
514        slots in the offset vector, the offset of the earliest inspected character
515        for the match and the offset of the end of the subject are set in them when
516        PCRE_ERROR_PARTIAL is returned.
517    
518    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
519        synonymous with PCRE_PARTIAL, for backwards compatibility, and
520        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
521        and may be more useful for multi-segment matching.
522    
523    11. Partial matching with pcre_exec() is now more intuitive. A partial match
524        used to be given if ever the end of the subject was reached; now it is
525        given only if matching could not proceed because another character was
526        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
527        string "Z", which now yields "no match" instead of "partial match". In the
528        case of pcre_dfa_exec(), "no match" is given if every matching path for the
529        final character ended with (*FAIL).
530    
531    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
532        if the pattern had a "must contain" character that was already found in the
533        earlier partial match, unless partial matching was again requested. For
534        example, with the pattern /dog.(body)?/, the "must contain" character is
535        "g". If the first part-match was for the string "dog", restarting with
536        "sbody" failed. This bug has been fixed.
537    
538    13. The string returned by pcre_dfa_exec() after a partial match has been
539        changed so that it starts at the first inspected character rather than the
540        first character of the match. This makes a difference only if the pattern
541        starts with a lookbehind assertion or \b or \B (\K is not supported by
542        pcre_dfa_exec()). It's an incompatible change, but it makes the two
543        matching functions compatible, and I think it's the right thing to do.
544    
545    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
546        so that the demonstration program is easily available in environments where
547        PCRE has not been installed from source.
548    
549    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
550        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
551        library.
552    
553    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
554        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
555        is not the first non-POSIX option to be added. Clearly some people find
556        these options useful.
557    
558    17. If a caller to the POSIX matching function regexec() passes a non-zero
559        value for nmatch with a NULL value for pmatch, the value of
560        nmatch is forced to zero.
561    
562    18. RunGrepTest did not have a test for the availability of the -u option of
563        the diff command, as RunTest does. It now checks in the same way as
564        RunTest, and also checks for the -b option.
565    
566    19. If an odd number of negated classes containing just a single character
567        interposed, within parentheses, between a forward reference to a named
568        subpattern and the definition of the subpattern, compilation crashed with
569        an internal error, complaining that it could not find the referenced
570        subpattern. An example of a crashing pattern is /(?&A)(([^m])(?<A>))/.
571        [The bug was that it was starting one character too far in when skipping
572        over the character class, thus treating the ] as data rather than
573        terminating the class. This meant it could skip too much.]
574    
575    20. Added PCRE_NOTEMPTY_ATSTART in order to be able to correctly implement the
576        /g option in pcretest when the pattern contains \K, which makes it possible
577        to have an empty string match not at the start, even when the pattern is
578        anchored. Updated pcretest and pcredemo to use this option.
579    
580    21. If the maximum number of capturing subpatterns in a recursion was greater
581        than the maximum at the outer level, the higher number was returned, but
582        with unset values at the outer level. The correct (outer level) value is
583        now given.
584    
585    22. If (*ACCEPT) appeared inside capturing parentheses, previous releases of
586        PCRE did not set those parentheses (unlike Perl). I have now found a way to
587        make it do so. The string so far is captured, making this feature
588        compatible with Perl.
589    
590    23. The tests have been re-organized, adding tests 11 and 12, to make it
591        possible to check the Perl 5.10 features against Perl 5.10.
592    
593    24. Perl 5.10 allows subroutine calls in lookbehinds, as long as the subroutine
594        pattern matches a fixed length string. PCRE did not allow this; now it
595        does. Neither allows recursion.
596    
597    25. I finally figured out how to implement a request to provide the minimum
598        length of subject string that was needed in order to match a given pattern.
599        (It was back references and recursion that I had previously got hung up
600        on.) This code has now been added to pcre_study(); it finds a lower bound
601        to the length of subject needed. It is not necessarily the greatest lower
602        bound, but using it to avoid searching strings that are too short does give
603        some useful speed-ups. The value is available to calling programs via
604        pcre_fullinfo().
605    
606    26. While implementing 25, I discovered to my embarrassment that pcretest had
607        not been passing the result of pcre_study() to pcre_dfa_exec(), so the
608        study optimizations had never been tested with that matching function.
609        Oops. What is worse, even when it was passed study data, there was a bug in
610        pcre_dfa_exec() that meant it never actually used it. Double oops. There
611        were also very few tests of studied patterns with pcre_dfa_exec().
612    
613    27. If (?| is used to create subpatterns with duplicate numbers, they are now
614        allowed to have the same name, even if PCRE_DUPNAMES is not set. However,
615        on the other side of the coin, they are no longer allowed to have different
616        names, because these cannot be distinguished in PCRE, and this has caused
617        confusion. (This is a difference from Perl.)
618    
619    28. When duplicate subpattern names are present (necessarily with different
620        numbers, as required by 27 above), and a test is made by name in a
621        conditional pattern, either for a subpattern having been matched, or for
622        recursion in such a pattern, all the associated numbered subpatterns are
623        tested, and the overall condition is true if the condition is true for any
624        one of them. This is the way Perl works, and is also more like the way
625        testing by number works.
626    
627    
628    Version 7.9 11-Apr-09
629    ---------------------
630    
631    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
632        (pcretest), all targets were linked against these libraries. This included
633        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
634        libraries. This caused unwanted dependencies to be created. This problem
635        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
636        pcretest is linked with readline.
637    
638    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
639        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
640        moved outside it again, because FALSE and TRUE are already defined in AIX,
641        but BOOL is not.
642    
643    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
644        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
645    
646    4.  The pcregrep documentation said spaces were inserted as well as colons (or
647        hyphens) following file names and line numbers when outputting matching
648        lines. This is not true; no spaces are inserted. I have also clarified the
649        wording for the --colour (or --color) option.
650    
651    5.  In pcregrep, when --colour was used with -o, the list of matching strings
652        was not coloured; this is different to GNU grep, so I have changed it to be
653        the same.
654    
655    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
656        each matching line was coloured. Now it goes on to look for further matches
657        of any of the test patterns, which is the same behaviour as GNU grep.
658    
659    7.  A pattern that could match an empty string could cause pcregrep to loop; it
660        doesn't make sense to accept an empty string match in pcregrep, so I have
661        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
662        seems to be how GNU grep behaves.
663    
664    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
665        start or after a newline", because the conditional assertion was not being
666        correctly handled. The rule now is that both the assertion and what follows
667        in the first alternative must satisfy the test.
668    
669    9.  If auto-callout was enabled in a pattern with a conditional group whose
670        condition was an assertion, PCRE could crash during matching, both with
671        pcre_exec() and pcre_dfa_exec().
672    
673    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
674        used for matching.
675    
676    11. Unicode property support in character classes was not working for
677        characters (bytes) greater than 127 when not in UTF-8 mode.
678    
679    12. Added the -M command line option to pcretest.
680    
681    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
682    
683    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
684    
685    16. Added comments and documentation about mis-use of no_arg in the C++
686        wrapper.
687    
688    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
689        from Martin Jerabek that uses macro names for all relevant character and
690        string constants.
691    
692    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
693        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
694        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
695        these, but not everybody uses configure.
696    
697    19. A conditional group that had only one branch was not being correctly
698        recognized as an item that could match an empty string. This meant that an
699        enclosing group might also not be so recognized, causing infinite looping
700        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
701        with the subject "ab", where knowledge that the repeated group can match
702        nothing is needed in order to break the loop.
703    
704    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
705        exec(), but without supplying a callout function, matching went wrong.
706    
707    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
708        leak if the size of the offset vector was greater than 30. When the vector
709        is smaller, the saved offsets during recursion go onto a local stack
710        vector, but for larger vectors malloc() is used. It was failing to free
711        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
712        error, in fact).
713    
714    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
715        heapframe that is used only when UTF-8 support is enabled. This caused no
716        problem, but was untidy.
717    
718    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
719        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
720        included within another project.
721    
722    24. Steven Van Ingelgem's patches to add more options to the CMake support,
723        slightly modified by me:
724    
725          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
726              not building pcregrep.
727    
728          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
729              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
730    
731    25. Forward references, both numeric and by name, in patterns that made use of
732        duplicate group numbers, could behave incorrectly or give incorrect errors,
733        because when scanning forward to find the reference group, PCRE was not
734        taking into account the duplicate group numbers. A pattern such as
735        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
736    
737    26. Changed a few more instances of "const unsigned char *" to USPTR, making
738        the feature of a custom pointer more persuasive (as requested by a user).
739    
740    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
741        pcretest.c, inside #ifndefs, because it seems they are sometimes already
742        pre-defined.
743    
744    28. Added support for (*UTF8) at the start of a pattern.
745    
746    29. Arrange for flags added by the "release type" setting in CMake to be shown
747        in the configuration summary.
748    
749    
750    Version 7.8 05-Sep-08
751    ---------------------
752    
753    1.  Replaced UCP searching code with optimized version as implemented for Ad
754        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
755        stage table and inline lookup instead of a function, giving speed ups of 2
756        to 5 times on some simple patterns that I tested. Permission was given to
757        distribute the MultiStage2.py script that generates the tables (it's not in
758        the tarball, but is in the Subversion repository).
759    
760    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
761        scripts.
762    
763    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
764        a group with a zero qualifier. The result of the study could be incorrect,
765        or the function might crash, depending on the pattern.
766    
767    4.  Caseless matching was not working for non-ASCII characters in back
768        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
769        It now works when Unicode Property Support is available.
770    
771    5.  In pcretest, an escape such as \x{de} in the data was always generating
772        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
773        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
774        truncation.
775    
776    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
777    
778    7.  Added two (int) casts to pcregrep when printing the difference of two
779        pointers, in case they are 64-bit values.
780    
781    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
782        test 2 if it fails.
783    
784    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
785        and a #define of that name to empty if it is not externally set. This is to
786        allow users of MSVC to set it if necessary.
787    
788    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
789        the convenience functions in the pcre_get.c source file.
790    
791    11. An option change at the start of a pattern that had top-level alternatives
792        could cause overwriting and/or a crash. This command provoked a crash in
793        some environments:
794    
795          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
796    
797        This potential security problem was recorded as CVE-2008-2371.
798    
799    12. For a pattern where the match had to start at the beginning or immediately
800        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
801        pcre_dfa_exec() could read past the end of the passed subject if there was
802        no match. To help with detecting such bugs (e.g. with valgrind), I modified
803        pcretest so that it places the subject at the end of its malloc-ed buffer.
804    
805    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
806        exec() might read past the end of the data buffer in UTF-8 mode.
807    
808    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
809        the data contained the byte 0x85 as part of a UTF-8 character within its
810        first line. This applied both to normal and DFA matching.
811    
812    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
813        /^[^d]*?$/8 failed to match "abc".
814    
815    16. Added a missing copyright notice to pcrecpp_internal.h.
816    
817    17. Make it more clear in the documentation that values returned from
818        pcre_exec() in ovector are byte offsets, not character counts.
819    
820    18. Tidied a few places to stop certain compilers from issuing warnings.
821    
822    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
823        supplied by Stefan Weber. I made a further small update for 7.8 because
824        there is a change of source arrangements: the pcre_searchfuncs.c module is
825        replaced by pcre_ucd.c.
826    
827    
828    Version 7.7 07-May-08
829    ---------------------
830    
831    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
832        a string to a long long, pretend we don't even have a long long." This is
833        done by checking for the strtoq, strtoll, and _strtoi64 functions.
834    
835    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
836        pre-7.6 versions, which defined a global no_arg variable instead of putting
837        it in the RE class. (See also #8 below.)
838    
839    3.  Remove a line of dead code, identified by coverity and reported by Nuno
840        Lopes.
841    
842    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
843    
844        (1) The include/exclude patterns were being applied to the whole pathnames
845            of files, instead of just to the final components.
846    
847        (2) If there was more than one level of directory, the subdirectories were
848            skipped unless they satisfied the include/exclude conditions. This is
849            inconsistent with GNU grep (and could even be seen as contrary to the
850            pcregrep specification - which I improved to make it absolutely clear).
851            The action now is always to scan all levels of directory, and just
852            apply the include/exclude patterns to regular files.
853    
854    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
855        --exclude_dir in the tests to avoid scanning .svn directories.
856    
857    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
858        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
859        doesn't support NULs in patterns.
860    
861    7.  Added some missing "const"s to declarations of static tables in
862        pcre_compile.c and pcre_dfa_exec.c.
863    
864    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
865        caused by fix #2  above. (Subsequently also a second patch to fix the
866        first patch. And a third patch - this was a messy problem.)
867    
868    9.  Applied Craig's patch to remove the use of push_back().
869    
870    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
871        matching function regexec().
872    
873    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
874        which, however, unlike Perl's \g{...}, are subroutine calls, not back
875        references. PCRE supports relative numbers with this syntax (I don't think
876        Oniguruma does).
877    
878    12. Previously, a group with a zero repeat such as (...){0} was completely
879        omitted from the compiled regex. However, this means that if the group
880        was called as a subroutine from elsewhere in the pattern, things went wrong
881        (an internal error was given). Such groups are now left in the compiled
882        pattern, with a new opcode that causes them to be skipped at execution
883        time.
884    
885    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
886        to the way PCRE behaves:
887    
888        (a) A lone ] character is dis-allowed (Perl treats it as data).
889    
890        (b) A back reference to an unmatched subpattern matches an empty string
891            (Perl fails the current match path).
892    
893        (c) A data ] in a character class must be notated as \] because if the
894            first data character in a class is ], it defines an empty class. (In
895            Perl it is not possible to have an empty class.) The empty class []
896            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
897            The negative empty class [^] matches any one character, independently
898            of the DOTALL setting.
899    
900    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
901        non-existent subpattern following a character class starting with ']' and
902        containing () gave an internal compiling error instead of "reference to
903        non-existent subpattern". Fortunately, when the pattern did exist, the
904        compiled code was correct. (When scanning forwards to check for the
905        existencd of the subpattern, it was treating the data ']' as terminating
906        the class, so got the count wrong. When actually compiling, the reference
907        was subsequently set up correctly.)
908    
909    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
910        it was being rejected as not supported by pcre_dfa_exec(), even though
911        other assertions are supported. I have made pcre_dfa_exec() support
912        (*FAIL).
913    
914    16. The implementation of 13c above involved the invention of a new opcode,
915        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
916        cannot be changed at match time, I realized I could make a small
917        improvement to matching performance by compiling OP_ALLANY instead of
918        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
919        on the OP_ANY path.
920    
921    17. Compiling pcretest on Windows with readline support failed without the
922        following two fixes: (1) Make the unistd.h include conditional on
923        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
924    
925    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
926        ncurses library to be included for pcretest when ReadLine support is
927        requested, but also to allow for it to be overridden. This patch came from
928        Daniel Bergström.
929    
930    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
931        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
932        any errors with the current Unicode tables. Thanks to Peter Kankowski for
933        spotting this.
934    
935    
936    Version 7.6 28-Jan-08
937    ---------------------
938    
939    1.  A character class containing a very large number of characters with
940        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
941        overflow.
942    
943    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
944        HAVE_LONG_LONG is not defined.
945    
946    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
947        bring them up to date and include new features. This patch includes:
948    
949        - Fixed PH's badly added libz and libbz2 support.
950        - Fixed a problem with static linking.
951        - Added pcredemo. [But later removed - see 7 below.]
952        - Fixed dftables problem and added an option.
953        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
954            HAVE_LONG_LONG.
955        - Added readline support for pcretest.
956        - Added an listing of the option settings after cmake has run.
957    
958    4.  A user submitted a patch to Makefile that makes it easy to create
959        "pcre.dll" under mingw when using Configure/Make. I added stuff to
960        Makefile.am that cause it to include this special target, without
961        affecting anything else. Note that the same mingw target plus all
962        the other distribution libraries and programs are now supported
963        when configuring with CMake (see 6 below) instead of with
964        Configure/Make.
965    
966    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
967        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
968        exported in the Windows port". It has not yet been confirmed that the patch
969        solves the problem, but it does no harm.
970    
971    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
972        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
973        with CMake, and also correct the comment about stack recursion.
974    
975    7.  Remove the automatic building of pcredemo from the ./configure system and
976        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
977        of a program that users should build themselves after PCRE is installed, so
978        building it automatically is not really right. What is more, it gave
979        trouble in some build environments.
980    
981    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
982    
983    
984    Version 7.5 10-Jan-08
985    ---------------------
986    
987    1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
988        values in parens when parsing an RE using the C++ wrapper."
989    
990    2.  Negative specials like \S did not work in character classes in UTF-8 mode.
991        Characters greater than 255 were excluded from the class instead of being
992        included.
993    
994    3.  The same bug as (2) above applied to negated POSIX classes such as
995        [:^space:].
996    
997    4.  PCRECPP_STATIC was referenced in pcrecpp_internal.h, but nowhere was it
998        defined or documented. It seems to have been a typo for PCRE_STATIC, so
999        I have changed it.
1000    
1001    5.  The construct (?&) was not diagnosed as a syntax error (it referenced the
1002        first named subpattern) and a construct such as (?&a) would reference the
1003        first named subpattern whose name started with "a" (in other words, the
1004        length check was missing). Both these problems are fixed. "Subpattern name
1005        expected" is now given for (?&) (a zero-length name), and this patch also
1006        makes it give the same error for \k'' (previously it complained that that
1007        was a reference to a non-existent subpattern).
1008    
1009    6.  The erroneous patterns (?+-a) and (?-+a) give different error messages;
1010        this is right because (?- can be followed by option settings as well as by
1011        digits. I have, however, made the messages clearer.
1012    
1013    7.  Patterns such as (?(1)a|b) (a pattern that contains fewer subpatterns
1014        than the number used in the conditional) now cause a compile-time error.
1015        This is actually not compatible with Perl, which accepts such patterns, but
1016        treats the conditional as always being FALSE (as PCRE used to), but it
1017        seems to me that giving a diagnostic is better.
1018    
1019    8.  Change "alphameric" to the more common word "alphanumeric" in comments
1020        and messages.
1021    
1022    9.  Fix two occurrences of "backslash" in comments that should have been
1023        "backspace".
1024    
1025    10. Remove two redundant lines of code that can never be obeyed (their function
1026        was moved elsewhere).
1027    
1028    11. The program that makes PCRE's Unicode character property table had a bug
1029        which caused it to generate incorrect table entries for sequences of
1030        characters that have the same character type, but are in different scripts.
1031        It amalgamated them into a single range, with the script of the first of
1032        them. In other words, some characters were in the wrong script. There were
1033        thirteen such cases, affecting characters in the following ranges:
1034    
1035          U+002b0 - U+002c1
1036          U+0060c - U+0060d
1037          U+0061e - U+00612
1038          U+0064b - U+0065e
1039          U+0074d - U+0076d
1040          U+01800 - U+01805
1041          U+01d00 - U+01d77
1042          U+01d9b - U+01dbf
1043          U+0200b - U+0200f
1044          U+030fc - U+030fe
1045          U+03260 - U+0327f
1046          U+0fb46 - U+0fbb1
1047          U+10450 - U+1049d
1048    
1049    12. The -o option (show only the matching part of a line) for pcregrep was not
1050        compatible with GNU grep in that, if there was more than one match in a
1051        line, it showed only the first of them. It now behaves in the same way as
1052        GNU grep.
1053    
1054    13. If the -o and -v options were combined for pcregrep, it printed a blank
1055        line for every non-matching line. GNU grep prints nothing, and pcregrep now
1056        does the same. The return code can be used to tell if there were any
1057        non-matching lines.
1058    
1059    14. Added --file-offsets and --line-offsets to pcregrep.
1060    
1061    15. The pattern (?=something)(?R) was not being diagnosed as a potentially
1062        infinitely looping recursion. The bug was that positive lookaheads were not
1063        being skipped when checking for a possible empty match (negative lookaheads
1064        and both kinds of lookbehind were skipped).
1065    
1066    16. Fixed two typos in the Windows-only code in pcregrep.c, and moved the
1067        inclusion of <windows.h> to before rather than after the definition of
1068        INVALID_FILE_ATTRIBUTES (patch from David Byron).
1069    
1070    17. Specifying a possessive quantifier with a specific limit for a Unicode
1071        character property caused pcre_compile() to compile bad code, which led at
1072        runtime to PCRE_ERROR_INTERNAL (-14). Examples of patterns that caused this
1073        are: /\p{Zl}{2,3}+/8 and /\p{Cc}{2}+/8. It was the possessive "+" that
1074        caused the error; without that there was no problem.
1075    
1076    18. Added --enable-pcregrep-libz and --enable-pcregrep-libbz2.
1077    
1078    19. Added --enable-pcretest-libreadline.
1079    
1080    20. In pcrecpp.cc, the variable 'count' was incremented twice in
1081        RE::GlobalReplace(). As a result, the number of replacements returned was
1082        double what it should be. I removed one of the increments, but Craig sent a
1083        later patch that removed the other one (the right fix) and added unit tests
1084        that check the return values (which was not done before).
1085    
1086    21. Several CMake things:
1087    
1088        (1) Arranged that, when cmake is used on Unix, the libraries end up with
1089            the names libpcre and libpcreposix, not just pcre and pcreposix.
1090    
1091        (2) The above change means that pcretest and pcregrep are now correctly
1092            linked with the newly-built libraries, not previously installed ones.
1093    
1094        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
1095    
1096    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
1097        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
1098        UTF-8 newline character). The key issue is that the pattern starts .*;
1099        this means that the match must be either at the beginning, or after a
1100        newline. The bug was in the code for advancing after a failed match and
1101        checking that the new position followed a newline. It was not taking
1102        account of UTF-8 characters correctly.
1103    
1104    23. PCRE was behaving differently from Perl in the way it recognized POSIX
1105        character classes. PCRE was not treating the sequence [:...:] as a
1106        character class unless the ... were all letters. Perl, however, seems to
1107        allow any characters between [: and :], though of course it rejects as
1108        unknown any "names" that contain non-letters, because all the known class
1109        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
1110        for example, whereas PCRE did not - it did not recognize a POSIX character
1111        class. This seemed a bit dangerous, so the code has been changed to be
1112        closer to Perl. The behaviour is not identical to Perl, because PCRE will
1113        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
1114        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
1115        Perl does, and where it didn't before.
1116    
1117    24. Rewrite so as to remove the single use of %n from pcregrep because in some
1118        Windows environments %n is disabled by default.
1119    
1120    
1121    Version 7.4 21-Sep-07
1122    ---------------------
1123    
1124    1.  Change 7.3/28 was implemented for classes by looking at the bitmap. This
1125        means that a class such as [\s] counted as "explicit reference to CR or
1126        LF". That isn't really right - the whole point of the change was to try to
1127        help when there was an actual mention of one of the two characters. So now
1128        the change happens only if \r or \n (or a literal CR or LF) character is
1129        encountered.
1130    
1131    2.  The 32-bit options word was also used for 6 internal flags, but the numbers
1132        of both had grown to the point where there were only 3 bits left.
1133        Fortunately, there was spare space in the data structure, and so I have
1134        moved the internal flags into a new 16-bit field to free up more option
1135        bits.
1136    
1137    3.  The appearance of (?J) at the start of a pattern set the DUPNAMES option,
1138        but did not set the internal JCHANGED flag - either of these is enough to
1139        control the way the "get" function works - but the PCRE_INFO_JCHANGED
1140        facility is supposed to tell if (?J) was ever used, so now (?J) at the
1141        start sets both bits.
1142    
1143    4.  Added options (at build time, compile time, exec time) to change \R from
1144        matching any Unicode line ending sequence to just matching CR, LF, or CRLF.
1145    
1146    5.  doc/pcresyntax.html was missing from the distribution.
1147    
1148    6.  Put back the definition of PCRE_ERROR_NULLWSLIMIT, for backward
1149        compatibility, even though it is no longer used.
1150    
1151    7.  Added macro for snprintf to pcrecpp_unittest.cc and also for strtoll and
1152        strtoull to pcrecpp.cc to select the available functions in WIN32 when the
1153        windows.h file is present (where different names are used). [This was
1154        reversed later after testing - see 16 below.]
1155    
1156    8.  Changed all #include <config.h> to #include "config.h". There were also
1157        some further <pcre.h> cases that I changed to "pcre.h".
1158    
1159    9.  When pcregrep was used with the --colour option, it missed the line ending
1160        sequence off the lines that it output.
1161    
1162    10. It was pointed out to me that arrays of string pointers cause lots of
1163        relocations when a shared library is dynamically loaded. A technique of
1164        using a single long string with a table of offsets can drastically reduce
1165        these. I have refactored PCRE in four places to do this. The result is
1166        dramatic:
1167    
1168          Originally:                          290
1169          After changing UCP table:            187
1170          After changing error message table:   43
1171          After changing table of "verbs"       36
1172          After changing table of Posix names   22
1173    
1174        Thanks to the folks working on Gregex for glib for this insight.
1175    
1176    11. --disable-stack-for-recursion caused compiling to fail unless -enable-
1177        unicode-properties was also set.
1178    
1179    12. Updated the tests so that they work when \R is defaulted to ANYCRLF.
1180    
1181    13. Added checks for ANY and ANYCRLF to pcrecpp.cc where it previously
1182        checked only for CRLF.
1183    
1184    14. Added casts to pcretest.c to avoid compiler warnings.
1185    
1186    15. Added Craig's patch to various pcrecpp modules to avoid compiler warnings.
1187    
1188    16. Added Craig's patch to remove the WINDOWS_H tests, that were not working,
1189        and instead check for _strtoi64 explicitly, and avoid the use of snprintf()
1190        entirely. This removes changes made in 7 above.
1191    
1192    17. The CMake files have been updated, and there is now more information about
1193        building with CMake in the NON-UNIX-USE document.
1194    
1195    
1196    Version 7.3 28-Aug-07
1197    ---------------------
1198    
1199     1. In the rejigging of the build system that eventually resulted in 7.1, the
1200        line "#include <pcre.h>" was included in pcre_internal.h. The use of angle
1201        brackets there is not right, since it causes compilers to look for an
1202        installed pcre.h, not the version that is in the source that is being
1203        compiled (which of course may be different). I have changed it back to:
1204    
1205          #include "pcre.h"
1206    
1207        I have a vague recollection that the change was concerned with compiling in
1208        different directories, but in the new build system, that is taken care of
1209        by the VPATH setting the Makefile.
1210    
1211     2. The pattern .*$ when run in not-DOTALL UTF-8 mode with newline=any failed
1212        when the subject happened to end in the byte 0x85 (e.g. if the last
1213        character was \x{1ec5}). *Character* 0x85 is one of the "any" newline
1214        characters but of course it shouldn't be taken as a newline when it is part
1215        of another character. The bug was that, for an unlimited repeat of . in
1216        not-DOTALL UTF-8 mode, PCRE was advancing by bytes rather than by
1217        characters when looking for a newline.
1218    
1219     3. A small performance improvement in the DOTALL UTF-8 mode .* case.
1220    
1221     4. Debugging: adjusted the names of opcodes for different kinds of parentheses
1222        in debug output.
1223    
1224     5. Arrange to use "%I64d" instead of "%lld" and "%I64u" instead of "%llu" for
1225        long printing in the pcrecpp unittest when running under MinGW.
1226    
1227     6. ESC_K was left out of the EBCDIC table.
1228    
1229     7. Change 7.0/38 introduced a new limit on the number of nested non-capturing
1230        parentheses; I made it 1000, which seemed large enough. Unfortunately, the
1231        limit also applies to "virtual nesting" when a pattern is recursive, and in
1232        this case 1000 isn't so big. I have been able to remove this limit at the
1233        expense of backing off one optimization in certain circumstances. Normally,
1234        when pcre_exec() would call its internal match() function recursively and
1235        immediately return the result unconditionally, it uses a "tail recursion"
1236        feature to save stack. However, when a subpattern that can match an empty
1237        string has an unlimited repetition quantifier, it no longer makes this
1238        optimization. That gives it a stack frame in which to save the data for
1239        checking that an empty string has been matched. Previously this was taken
1240        from the 1000-entry workspace that had been reserved. So now there is no
1241        explicit limit, but more stack is used.
1242    
1243     8. Applied Daniel's patches to solve problems with the import/export magic
1244        syntax that is required for Windows, and which was going wrong for the
1245        pcreposix and pcrecpp parts of the library. These were overlooked when this
1246        problem was solved for the main library.
1247    
1248     9. There were some crude static tests to avoid integer overflow when computing
1249        the size of patterns that contain repeated groups with explicit upper
1250        limits. As the maximum quantifier is 65535, the maximum group length was
1251        set at 30,000 so that the product of these two numbers did not overflow a
1252        32-bit integer. However, it turns out that people want to use groups that
1253        are longer than 30,000 bytes (though not repeat them that many times).
1254        Change 7.0/17 (the refactoring of the way the pattern size is computed) has
1255        made it possible to implement the integer overflow checks in a much more
1256        dynamic way, which I have now done. The artificial limitation on group
1257        length has been removed - we now have only the limit on the total length of
1258        the compiled pattern, which depends on the LINK_SIZE setting.
1259    
1260    10. Fixed a bug in the documentation for get/copy named substring when
1261        duplicate names are permitted. If none of the named substrings are set, the
1262        functions return PCRE_ERROR_NOSUBSTRING (7); the doc said they returned an
1263        empty string.
1264    
1265    11. Because Perl interprets \Q...\E at a high level, and ignores orphan \E
1266        instances, patterns such as [\Q\E] or [\E] or even [^\E] cause an error,
1267        because the ] is interpreted as the first data character and the
1268        terminating ] is not found. PCRE has been made compatible with Perl in this
1269        regard. Previously, it interpreted [\Q\E] as an empty class, and [\E] could
1270        cause memory overwriting.
1271    
1272    10. Like Perl, PCRE automatically breaks an unlimited repeat after an empty
1273        string has been matched (to stop an infinite loop). It was not recognizing
1274        a conditional subpattern that could match an empty string if that
1275        subpattern was within another subpattern. For example, it looped when
1276        trying to match  (((?(1)X|))*)  but it was OK with  ((?(1)X|)*)  where the
1277        condition was not nested. This bug has been fixed.
1278    
1279    12. A pattern like \X?\d or \P{L}?\d in non-UTF-8 mode could cause a backtrack
1280        past the start of the subject in the presence of bytes with the top bit
1281        set, for example "\x8aBCD".
1282    
1283    13. Added Perl 5.10 experimental backtracking controls (*FAIL), (*F), (*PRUNE),
1284        (*SKIP), (*THEN), (*COMMIT), and (*ACCEPT).
1285    
1286    14. Optimized (?!) to (*FAIL).
1287    
1288    15. Updated the test for a valid UTF-8 string to conform to the later RFC 3629.
1289        This restricts code points to be within the range 0 to 0x10FFFF, excluding
1290        the "low surrogate" sequence 0xD800 to 0xDFFF. Previously, PCRE allowed the
1291        full range 0 to 0x7FFFFFFF, as defined by RFC 2279. Internally, it still
1292        does: it's just the validity check that is more restrictive.
1293    
1294    16. Inserted checks for integer overflows during escape sequence (backslash)
1295        processing, and also fixed erroneous offset values for syntax errors during
1296        backslash processing.
1297    
1298    17. Fixed another case of looking too far back in non-UTF-8 mode (cf 12 above)
1299        for patterns like [\PPP\x8a]{1,}\x80 with the subject "A\x80".
1300    
1301    18. An unterminated class in a pattern like (?1)\c[ with a "forward reference"
1302        caused an overrun.
1303    
1304    19. A pattern like (?:[\PPa*]*){8,} which had an "extended class" (one with
1305        something other than just ASCII characters) inside a group that had an
1306        unlimited repeat caused a loop at compile time (while checking to see
1307        whether the group could match an empty string).
1308    
1309    20. Debugging a pattern containing \p or \P could cause a crash. For example,
1310        [\P{Any}] did so. (Error in the code for printing property names.)
1311    
1312    21. An orphan \E inside a character class could cause a crash.
1313    
1314    22. A repeated capturing bracket such as (A)? could cause a wild memory
1315        reference during compilation.
1316    
1317    23. There are several functions in pcre_compile() that scan along a compiled
1318        expression for various reasons (e.g. to see if it's fixed length for look
1319        behind). There were bugs in these functions when a repeated \p or \P was
1320        present in the pattern. These operators have additional parameters compared
1321        with \d, etc, and these were not being taken into account when moving along
1322        the compiled data. Specifically:
1323    
1324        (a) A item such as \p{Yi}{3} in a lookbehind was not treated as fixed
1325            length.
1326    
1327        (b) An item such as \pL+ within a repeated group could cause crashes or
1328            loops.
1329    
1330        (c) A pattern such as \p{Yi}+(\P{Yi}+)(?1) could give an incorrect
1331            "reference to non-existent subpattern" error.
1332    
1333        (d) A pattern like (\P{Yi}{2}\277)? could loop at compile time.
1334    
1335    24. A repeated \S or \W in UTF-8 mode could give wrong answers when multibyte
1336        characters were involved (for example /\S{2}/8g with "A\x{a3}BC").
1337    
1338    25. Using pcregrep in multiline, inverted mode (-Mv) caused it to loop.
1339    
1340    26. Patterns such as [\P{Yi}A] which include \p or \P and just one other
1341        character were causing crashes (broken optimization).
1342    
1343    27. Patterns such as (\P{Yi}*\277)* (group with possible zero repeat containing
1344        \p or \P) caused a compile-time loop.
1345    
1346    28. More problems have arisen in unanchored patterns when CRLF is a valid line
1347        break. For example, the unstudied pattern [\r\n]A does not match the string
1348        "\r\nA" because change 7.0/46 below moves the current point on by two
1349        characters after failing to match at the start. However, the pattern \nA
1350        *does* match, because it doesn't start till \n, and if [\r\n]A is studied,
1351        the same is true. There doesn't seem any very clean way out of this, but
1352        what I have chosen to do makes the common cases work: PCRE now takes note
1353        of whether there can be an explicit match for \r or \n anywhere in the
1354        pattern, and if so, 7.0/46 no longer applies. As part of this change,
1355        there's a new PCRE_INFO_HASCRORLF option for finding out whether a compiled
1356        pattern has explicit CR or LF references.
1357    
1358    29. Added (*CR) etc for changing newline setting at start of pattern.
1359    
1360    
1361    Version 7.2 19-Jun-07
1362    ---------------------
1363    
1364     1. If the fr_FR locale cannot be found for test 3, try the "french" locale,
1365        which is apparently normally available under Windows.
1366    
1367     2. Re-jig the pcregrep tests with different newline settings in an attempt
1368        to make them independent of the local environment's newline setting.
1369    
1370     3. Add code to configure.ac to remove -g from the CFLAGS default settings.
1371    
1372     4. Some of the "internals" tests were previously cut out when the link size
1373        was not 2, because the output contained actual offsets. The recent new
1374        "Z" feature of pcretest means that these can be cut out, making the tests
1375        usable with all link sizes.
1376    
1377     5. Implemented Stan Switzer's goto replacement for longjmp() when not using
1378        stack recursion. This gives a massive performance boost under BSD, but just
1379        a small improvement under Linux. However, it saves one field in the frame
1380        in all cases.
1381    
1382     6. Added more features from the forthcoming Perl 5.10:
1383    
1384        (a) (?-n) (where n is a string of digits) is a relative subroutine or
1385            recursion call. It refers to the nth most recently opened parentheses.
1386    
1387        (b) (?+n) is also a relative subroutine call; it refers to the nth next
1388            to be opened parentheses.
1389    
1390        (c) Conditions that refer to capturing parentheses can be specified
1391            relatively, for example, (?(-2)... or (?(+3)...
1392    
1393        (d) \K resets the start of the current match so that everything before
1394            is not part of it.
1395    
1396        (e) \k{name} is synonymous with \k<name> and \k'name' (.NET compatible).
1397    
1398        (f) \g{name} is another synonym - part of Perl 5.10's unification of
1399            reference syntax.
1400    
1401        (g) (?| introduces a group in which the numbering of parentheses in each
1402            alternative starts with the same number.
1403    
1404        (h) \h, \H, \v, and \V match horizontal and vertical whitespace.
1405    
1406     7. Added two new calls to pcre_fullinfo(): PCRE_INFO_OKPARTIAL and
1407        PCRE_INFO_JCHANGED.
1408    
1409     8. A pattern such as  (.*(.)?)*  caused pcre_exec() to fail by either not
1410        terminating or by crashing. Diagnosed by Viktor Griph; it was in the code
1411        for detecting groups that can match an empty string.
1412    
1413     9. A pattern with a very large number of alternatives (more than several
1414        hundred) was running out of internal workspace during the pre-compile
1415        phase, where pcre_compile() figures out how much memory will be needed. A
1416        bit of new cunning has reduced the workspace needed for groups with
1417        alternatives. The 1000-alternative test pattern now uses 12 bytes of
1418        workspace instead of running out of the 4096 that are available.
1419    
1420    10. Inserted some missing (unsigned int) casts to get rid of compiler warnings.
1421    
1422    11. Applied patch from Google to remove an optimization that didn't quite work.
1423        The report of the bug said:
1424    
1425          pcrecpp::RE("a*").FullMatch("aaa") matches, while
1426          pcrecpp::RE("a*?").FullMatch("aaa") does not, and
1427          pcrecpp::RE("a*?\\z").FullMatch("aaa") does again.
1428    
1429    12. If \p or \P was used in non-UTF-8 mode on a character greater than 127
1430        it matched the wrong number of bytes.
1431    
1432    
1433    Version 7.1 24-Apr-07
1434  ---------------------  ---------------------
1435    
1436   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one   1. Applied Bob Rossi and Daniel G's patches to convert the build system to one
# Line 26  Version 7.1 12-Mar-07 Line 1455  Version 7.1 12-Mar-07
1455      .br or .in.      .br or .in.
1456    
1457   4. Updated comments in configure.ac that get placed in config.h.in and also   4. Updated comments in configure.ac that get placed in config.h.in and also
1458      arranged for config.h to be included in the distribution, with the name      arranged for config.h to be included in the distribution, with the name
1459      config.h.generic, for the benefit of those who have to compile without      config.h.generic, for the benefit of those who have to compile without
1460      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).      Autotools (compare pcre.h, which is now distributed as pcre.h.generic).
1461    
1462   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan   5. Updated the support (such as it is) for Virtual Pascal, thanks to Stefan
1463      Weber: (1) pcre_internal.h was missing some function renames; (2) updated      Weber: (1) pcre_internal.h was missing some function renames; (2) updated
1464      makevp.bat for the current PCRE, using the additional files !compile.txt,      makevp.bat for the current PCRE, using the additional files
1465      !linklib.txt, and pcregexp.pas.      makevp_c.txt, makevp_l.txt, and pcregexp.pas.
1466    
1467   6. A Windows user reported a minor discrepancy with test 2, which turned out   6. A Windows user reported a minor discrepancy with test 2, which turned out
1468      to be caused by a trailing space on an input line that had got lost in his      to be caused by a trailing space on an input line that had got lost in his
# Line 63  Version 7.1 12-Mar-07 Line 1492  Version 7.1 12-Mar-07
1492  10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:  10. Fixed two bugs in the emulated memmove() function in pcre_internal.h:
1493    
1494      (a) It was defining its arguments as char * instead of void *.      (a) It was defining its arguments as char * instead of void *.
1495    
1496      (b) It was assuming that all moves were upwards in memory; this was true      (b) It was assuming that all moves were upwards in memory; this was true
1497          a long time ago when I wrote it, but is no longer the case.          a long time ago when I wrote it, but is no longer the case.
1498    
1499      The emulated memove() is provided for those environments that have neither      The emulated memove() is provided for those environments that have neither
1500      memmove() nor bcopy(). I didn't think anyone used it these days, but that      memmove() nor bcopy(). I didn't think anyone used it these days, but that
1501      is clearly not the case, as these two bugs were recently reported.      is clearly not the case, as these two bugs were recently reported.
1502    
1503  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,  11. The script PrepareRelease is now distributed: it calls 132html, CleanTxt,
1504      and Detrail to create the HTML documentation, the .txt form of the man      and Detrail to create the HTML documentation, the .txt form of the man
1505      pages, and it removes trailing spaces from listed files. It also creates      pages, and it removes trailing spaces from listed files. It also creates
1506      pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter      pcre.h.generic and config.h.generic from pcre.h and config.h. In the latter
1507      case, it wraps all the #defines with #ifndefs. This script should be run      case, it wraps all the #defines with #ifndefs. This script should be run
1508      before "make dist".      before "make dist".
1509    
1510  12. Fixed two fairly obscure bugs concerned with quantified caseless matching  12. Fixed two fairly obscure bugs concerned with quantified caseless matching
1511      with Unicode property support.      with Unicode property support.
1512    
1513      (a) For a maximizing quantifier, if the two different cases of the      (a) For a maximizing quantifier, if the two different cases of the
1514          character were of different lengths in their UTF-8 codings (there are          character were of different lengths in their UTF-8 codings (there are
1515          some cases like this - I found 11), and the matching function had to          some cases like this - I found 11), and the matching function had to
1516          back up over a mixture of the two cases, it incorrectly assumed they          back up over a mixture of the two cases, it incorrectly assumed they
1517          were both the same length.          were both the same length.
1518    
1519      (b) When PCRE was configured to use the heap rather than the stack for      (b) When PCRE was configured to use the heap rather than the stack for
1520          recursion during matching, it was not correctly preserving the data for          recursion during matching, it was not correctly preserving the data for
1521          the other case of a UTF-8 character when checking ahead for a match          the other case of a UTF-8 character when checking ahead for a match
1522          while processing a minimizing repeat. If the check also involved          while processing a minimizing repeat. If the check also involved
1523          matching a wide character, but failed, corruption could cause an          matching a wide character, but failed, corruption could cause an
1524          erroneous result when trying to check for a repeat of the original          erroneous result when trying to check for a repeat of the original
1525          character.          character.
1526    
1527  13. Some tidying changes to the testing mechanism:  13. Some tidying changes to the testing mechanism:
1528    
1529      (a) The RunTest script now detects the internal link size and whether there      (a) The RunTest script now detects the internal link size and whether there
1530          is UTF-8 and UCP support by running ./pcretest -C instead of relying on          is UTF-8 and UCP support by running ./pcretest -C instead of relying on
1531          values substituted by "configure". (The RunGrepTest script already did          values substituted by "configure". (The RunGrepTest script already did
1532          this for UTF-8.) The configure.ac script no longer substitutes the          this for UTF-8.) The configure.ac script no longer substitutes the
1533          relevant variables.          relevant variables.
1534    
1535      (b) The debugging options /B and /D in pcretest show the compiled bytecode      (b) The debugging options /B and /D in pcretest show the compiled bytecode
1536          with length and offset values. This means that the output is different          with length and offset values. This means that the output is different
1537          for different internal link sizes. Test 2 is skipped for link sizes          for different internal link sizes. Test 2 is skipped for link sizes
1538          other than 2 because of this, bypassing the problem. Unfortunately,          other than 2 because of this, bypassing the problem. Unfortunately,
1539          there was also a test in test 3 (the locale tests) that used /B and          there was also a test in test 3 (the locale tests) that used /B and
1540          failed for link sizes other than 2. Rather than cut the whole test out,          failed for link sizes other than 2. Rather than cut the whole test out,
1541          I have added a new /Z option to pcretest that replaces the length and          I have added a new /Z option to pcretest that replaces the length and
1542          offset values with spaces. This is now used to make test 3 independent          offset values with spaces. This is now used to make test 3 independent
1543          of link size. (Test 2 will be tidied up later.)          of link size. (Test 2 will be tidied up later.)
1544    
1545  14. If erroroffset was passed as NULL to pcre_compile, it provoked a  14. If erroroffset was passed as NULL to pcre_compile, it provoked a
1546      segmentation fault instead of returning the appropriate error message.      segmentation fault instead of returning the appropriate error message.
1547    
1548    15. In multiline mode when the newline sequence was set to "any", the pattern
1549        ^$ would give a match between the \r and \n of a subject such as "A\r\nB".
1550        This doesn't seem right; it now treats the CRLF combination as the line
1551        ending, and so does not match in that case. It's only a pattern such as ^$
1552        that would hit this one: something like ^ABC$ would have failed after \r
1553        and then tried again after \r\n.
1554    
1555    16. Changed the comparison command for RunGrepTest from "diff -u" to "diff -ub"
1556        in an attempt to make files that differ only in their line terminators
1557        compare equal. This works on Linux.
1558    
1559    17. Under certain error circumstances pcregrep might try to free random memory
1560        as it exited. This is now fixed, thanks to valgrind.
1561    
1562    19. In pcretest, if the pattern /(?m)^$/g<any> was matched against the string
1563        "abc\r\n\r\n", it found an unwanted second match after the second \r. This
1564        was because its rules for how to advance for /g after matching an empty
1565        string at the end of a line did not allow for this case. They now check for
1566        it specially.
1567    
1568    20. pcretest is supposed to handle patterns and data of any length, by
1569        extending its buffers when necessary. It was getting this wrong when the
1570        buffer for a data line had to be extended.
1571    
1572    21. Added PCRE_NEWLINE_ANYCRLF which is like ANY, but matches only CR, LF, or
1573        CRLF as a newline sequence.
1574    
1575    22. Code for handling Unicode properties in pcre_dfa_exec() wasn't being cut
1576        out by #ifdef SUPPORT_UCP. This did no harm, as it could never be used, but
1577        I have nevertheless tidied it up.
1578    
1579    23. Added some casts to kill warnings from HP-UX ia64 compiler.
1580    
1581    24. Added a man page for pcre-config.
1582    
1583    
1584  Version 7.0 19-Dec-06  Version 7.0 19-Dec-06
1585  ---------------------  ---------------------

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