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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.33 xx-xxxx-201x  Version 8.35-RC1 04-March-2014
5  -------------------------  ------------------------------
6    
7    1.  A new flag is set, when property checks are present in an XCLASS.
8        When this flag is not set, PCRE can perform certain optimizations
9        such as studying these XCLASS-es.
10    
11    2.  The auto-possessification of character sets were improved: a normal
12        and an extended character set can be compared now. Furthermore
13        the JIT compiler optimizes more character set checks.
14    
15    3.  Got rid of some compiler warnings for potentially uninitialized variables
16        that show up only when compiled with -O2.
17    
18    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
19        of a match later then the end of the match. The pcretest program was not
20        handling the case sensibly - it was outputting from the start to the next
21        binary zero. It now reports this situation in a message, and outputs the
22        text from the end to the start.
23    
24    5.  Fast forward search is improved in JIT. Instead of the first three
25        characters, any three characters with fixed position can be searched.
26        Search order: first, last, middle.
27    
28    6.  Improve character range checks in JIT. Characters are read by an inprecise
29        function now, which returns with an unknown value if the character code is
30        above a certain treshold (e.g: 256). The only limitation is that the value
31        must be bigger than the treshold as well. This function is useful, when
32        the characters above the treshold are handled in the same way.
33    
34    7.  The macros whose names start with RAWUCHAR are placeholders for a future
35        mode in which only the bottom 21 bits of 32-bit data items are used. To
36        make this more memorable for those maintaining the code, the names have
37        been changed to start with UCHAR21, and an extensive comment has been added
38        to their definition.
39    
40    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
41        to the export list in Makefile.am (they were accidentally omitted from the
42        8.34 tarball).
43    
44    9.  The informational output from pcretest used the phrase "starting byte set"
45        which is inappropriate for the 16-bit and 32-bit libraries. As the output
46        for "first char" and "need char" really means "non-UTF-char", I've changed
47        "byte" to "char", and slightly reworded the output. The documentation about
48        these values has also been (I hope) clarified.
49    
50    10. Another JIT related optimization: use table jumps for selecting the correct
51        backtracking path, when more than four alternatives are present inside a
52        bracket.
53    
54    11. Empty match is not possible, when the minimum length is greater than zero,
55        and there is no \K in the pattern. JIT should avoid empty match checks in
56        such cases.
57    
58    12. In a caseless character class with UCP support, when a character with more
59        than one alternative case was not the first character of a range, not all
60        the alternative cases were added to the class. For example, s and \x{17f}
61        are both alternative cases for S: the class [RST] was handled correctly,
62        but [R-T] was not.
63    
64    13. The configure.ac file always checked for pthread support when JIT was
65        enabled. This is not used in Windows, so I have put this test inside a
66        check for the presence of windows.h (which was already tested for).
67    
68    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
69        The algorithm provides a way to skip certain starting offsets, and usually
70        faster than linear prefix searches.
71    
72    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
73        as for 'fr_FR' and 'french'. For some reason, however, it then used the
74        Windows-specific input and output files, which have 'french' screwed in.
75        So this could never have worked. One of the problems with locales is that
76        they aren't always the same. I have now updated RunTest so that it checks
77        the output of the locale test (test 3) against three different output
78        files, and it allows the test to pass if any one of them matches. With luck
79        this should make the test pass on some versions of Solaris where it was
80        failing. Because of the uncertainty, the script did not used to stop if
81        test 3 failed; it now does. If further versions of a French locale ever
82        come to light, they can now easily be added.
83    
84    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
85        there was a message during ./configure, but it did not stop. This now
86        provokes an error. The invalid example in README has been corrected.
87        If a value less than the minimum is given, the minimum value has always
88        been used, but now a warning is given.
89    
90    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
91        was a bug in the test system, which is now fixed. Also, the list of various
92        configurations that are tested for each release did not have one with both
93        16/32 bits and --enable-bar-anycrlf. It now does.
94    
95    18. pcretest was missing "-C bsr" for displaying the \R default setting.
96    
97    19. Little endian PowerPC systems are supported now by the JIT compiler.
98    
99    20. The fast forward newline mechanism could enter to an infinite loop on
100        certain invalid UTF-8 input. Although we don't support these cases
101        this issue can be fixed by a performance optimization.
102    
103    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
104        not take account if existing stack usage. There is now a new global
105        variable called pcre_stack_guard that can be set to point to an external
106        function to check stack availability. It is called at the start of
107        processing every parenthesized group.
108    
109    22. A typo in the code meant that in ungreedy mode the max/min qualifier
110        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
111        not match "ab".
112    
113    
114    Version 8.34 15-December-2013
115    -----------------------------
116    
117    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
118        executable memory. Patch inspired by Carsten Klein.
119    
120    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
121        this macro is never tested and has no effect, because the work to support
122        coverage involves only compiling and linking options and special targets in
123        the Makefile. The comment in config.h implied that defining the macro would
124        enable coverage support, which is totally false. There was also support for
125        setting this macro in the CMake files (my fault, I just copied it from
126        configure). SUPPORT_GCOV has now been removed.
127    
128    3.  Make a small performance improvement in strlen16() and strlen32() in
129        pcretest.
130    
131    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
132        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
133        these cases). There was also one in pcretest.c.
134    
135    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
136    
137    6.  In UTF mode, the code for checking whether a group could match an empty
138        string (which is used for indefinitely repeated groups to allow for
139        breaking an infinite loop) was broken when the group contained a repeated
140        negated single-character class with a character that occupied more than one
141        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
142        UTF-8 mode). The effect was undefined: the group might or might not be
143        deemed as matching an empty string, or the program might have crashed.
144    
145    7.  The code for checking whether a group could match an empty string was not
146        recognizing that \h, \H, \v, \V, and \R must match a character.
147    
148    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
149        an empty string. If it can, pcretest shows this in its information output.
150    
151    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
152        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
153        matched by pcre_exec() without using JIT:
154    
155        (a) If the rest of the pattern did not match after a maximal run of
156            grapheme clusters, the code for backing up to try with fewer of them
157            did not always back up over a full grapheme when characters that do not
158            have the modifier quality were involved, e.g. Hangul syllables.
159    
160        (b) If the match point in a subject started with modifier character, and
161            there was no match, the code could incorrectly back up beyond the match
162            point, and potentially beyond the first character in the subject,
163            leading to a segfault or an incorrect match result.
164    
165    10. A conditional group with an assertion condition could lead to PCRE
166        recording an incorrect first data item for a match if no other first data
167        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
168        first data item, and therefore matched "ca" after "c" instead of at the
169        start.
170    
171    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
172        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
173    
174    12. The source of pcregrep now includes z/OS-specific code so that it can be
175        compiled for z/OS as part of the special z/OS distribution.
176    
177    13. Added the -T and -TM options to pcretest.
178    
179    14. The code in pcre_compile.c for creating the table of named capturing groups
180        has been refactored. Instead of creating the table dynamically during the
181        actual compiling pass, the information is remembered during the pre-compile
182        pass (on the stack unless there are more than 20 named groups, in which
183        case malloc() is used) and the whole table is created before the actual
184        compile happens. This has simplified the code (it is now nearly 150 lines
185        shorter) and prepared the way for better handling of references to groups
186        with duplicate names.
187    
188    15. A back reference to a named subpattern when there is more than one of the
189        same name now checks them in the order in which they appear in the pattern.
190        The first one that is set is used for the reference. Previously only the
191        first one was inspected. This change makes PCRE more compatible with Perl.
192    
193    16. Unicode character properties were updated from Unicode 6.3.0.
194    
195    17. The compile-time code for auto-possessification has been refactored, based
196        on a patch by Zoltan Herczeg. It now happens after instead of during
197        compilation. The code is cleaner, and more cases are handled. The option
198        PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
199        options in pcretest are provided to set it. It can also be set by
200        (*NO_AUTO_POSSESS) at the start of a pattern.
201    
202    18. The character VT has been added to the default ("C" locale) set of
203        characters that match \s and are generally treated as white space,
204        following this same change in Perl 5.18. There is now no difference between
205        "Perl space" and "POSIX space". Whether VT is treated as white space in
206        other locales depends on the locale.
207    
208    19. The code for checking named groups as conditions, either for being set or
209        for being recursed, has been refactored (this is related to 14 and 15
210        above). Processing unduplicated named groups should now be as fast at
211        numerical groups, and processing duplicated groups should be faster than
212        before.
213    
214    20. Two patches to the CMake build system, by Alexander Barkov:
215    
216          (1) Replace the "source" command by "." in CMakeLists.txt because
217              "source" is a bash-ism.
218    
219          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
220              without these the CMake build does not work on Solaris.
221    
222    21. Perl has changed its handling of \8 and \9. If there is no previously
223        encountered capturing group of those numbers, they are treated as the
224        literal characters 8 and 9 instead of a binary zero followed by the
225        literals. PCRE now does the same.
226    
227    22. Following Perl, added \o{} to specify codepoints in octal, making it
228        possible to specify values greater than 0777 and also making them
229        unambiguous.
230    
231    23. Perl now gives an error for missing closing braces after \x{... instead of
232        treating the string as literal. PCRE now does the same.
233    
234    24. RunTest used to grumble if an inappropriate test was selected explicitly,
235        but just skip it when running all tests. This make it awkward to run ranges
236        of tests when one of them was inappropriate. Now it just skips any
237        inappropriate tests, as it always did when running all tests.
238    
239    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
240        character types such as \d or \w, too many callouts were inserted, and the
241        data that they returned was rubbish.
242    
243    26. In UCP mode, \s was not matching two of the characters that Perl matches,
244        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
245        were matched by \h. The code has now been refactored so that the lists of
246        the horizontal and vertical whitespace characters used for \h and \v (which
247        are defined only in one place) are now also used for \s.
248    
249    27. Add JIT support for the 64 bit TileGX architecture.
250        Patch by Jiong Wang (Tilera Corporation).
251    
252    28. Possessive quantifiers for classes (both explicit and automatically
253        generated) now use special opcodes instead of wrapping in ONCE brackets.
254    
255    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
256        (because it's meaningless), this was not happening when PCRE_CASELESS was
257        set. Not wrong, but inefficient.
258    
259    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
260        properties for \w, \d, etc) is present in a test regex. Otherwise if the
261        test contains no characters greater than 255, Perl doesn't realise it
262        should be using Unicode semantics.
263    
264    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
265        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
266        does in Unicode mode.
267    
268    32. Added the "forbid" facility to pcretest so that putting tests into the
269        wrong test files can sometimes be quickly detected.
270    
271    33. There is now a limit (default 250) on the depth of nesting of parentheses.
272        This limit is imposed to control the amount of system stack used at compile
273        time. It can be changed at build time by --with-parens-nest-limit=xxx or
274        the equivalent in CMake.
275    
276    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
277        errors. Perl warns for these when in warning mode, but PCRE has no facility
278        for giving warnings.
279    
280    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
281        However, this was not working for (?!) because it is optimized to (*FAIL),
282        for which PCRE does not allow quantifiers. The optimization is now disabled
283        when a quantifier follows (?!). I can't see any use for this, but it makes
284        things uniform.
285    
286    36. Perl no longer allows group names to start with digits, so I have made this
287        change also in PCRE. It simplifies the code a bit.
288    
289    37. In extended mode, Perl ignores spaces before a + that indicates a
290        possessive quantifier. PCRE allowed a space before the quantifier, but not
291        before the possessive +. It now does.
292    
293    38. The use of \K (reset reported match start) within a repeated possessive
294        group such as (a\Kb)*+ was not working.
295    
296    40. Document that the same character tables must be used at compile time and
297        run time, and that the facility to pass tables to pcre_exec() and
298        pcre_dfa_exec() is for use only with saved/restored patterns.
299    
300    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
301        features for Builds with MSVC:
302    
303        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
304           builds). The .rc files can be used to set FileDescription and many other
305           attributes.
306    
307        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
308           This allows higher-level build scripts which want .pdb files to avoid
309           hard-coding the exact files needed."
310    
311    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
312        mean "start of word" and "end of word", respectively, as a transition aid.
313    
314    43. A minimizing repeat of a class containing codepoints greater than 255 in
315        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
316        compiled to use the heap for recursion.
317    
318    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
319        is configured.
320    
321    
322    Version 8.33 28-May-2013
323    ------------------------
324    
325  1.  Added 'U' to some constants that are compared to unsigned integers, to  1.  Added 'U' to some constants that are compared to unsigned integers, to
326      avoid compiler signed/unsigned warnings. Added (int) casts to unsigned      avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
# Line 14  Version 8.33 xx-xxxx-201x Line 332  Version 8.33 xx-xxxx-201x
332    
333  3.  Revise the creation of config.h.generic so that all boolean macros are  3.  Revise the creation of config.h.generic so that all boolean macros are
334      #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes      #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
335      overriding via -D on the command line possible.      overriding via -D on the command line possible.
336    
337  4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar  4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
338      to unsigned int is reported to make a quite noticeable speed difference in      to unsigned int is reported to make a quite noticeable speed difference in
339      a specific Windows environment. Testing on Linux did also appear to show      a specific Windows environment. Testing on Linux did also appear to show
340      some benefit (and it is clearly not harmful). Also fixed the definition of      some benefit (and it is clearly not harmful). Also fixed the definition of
341      Xop which should be unsigned.      Xop which should be unsigned.
342    
343  5.  Related to (4), changing the definition of the intermediate variable cc  5.  Related to (4), changing the definition of the intermediate variable cc
344      in repeated character loops from pcre_uchar to pcre_uint32 also gave speed      in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
# Line 28  Version 8.33 xx-xxxx-201x Line 346  Version 8.33 xx-xxxx-201x
346    
347  6.  Fix forward search in JIT when link size is 3 or greater. Also removed some  6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
348      unnecessary spaces.      unnecessary spaces.
349    
350  7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12  7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
351      and later.      and later.
352    
353  8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.  8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
354    
355  9.  Optimizing fast_forward_start_bits in JIT.  9.  Optimizing fast_forward_start_bits in JIT.
356    
357  10. Adding experimental support for callouts in JIT, and fixing some  10. Adding support for callouts in JIT, and fixing some issues revealed
358      issues revealed during this work. Namely:      during this work. Namely:
359    
360      (a) Unoptimized capturing brackets incorrectly reset on backtrack.      (a) Unoptimized capturing brackets incorrectly reset on backtrack.
361    
362      (b) Minimum length was not checked before the matching is started.      (b) Minimum length was not checked before the matching is started.
363    
364  11. The value of capture_last that is passed to callouts was incorrect in some  11. The value of capture_last that is passed to callouts was incorrect in some
365      cases when there was a capture on one path that was subsequently abandoned      cases when there was a capture on one path that was subsequently abandoned
366      after a backtrack. Also, the capture_last value is now reset after a      after a backtrack. Also, the capture_last value is now reset after a
367      recursion, since all captures are also reset in this case.      recursion, since all captures are also reset in this case.
368    
369  12. The interpreter no longer returns the "too many substrings" error in the  12. The interpreter no longer returns the "too many substrings" error in the
370      case when an overflowing capture is in a branch that is subsequently      case when an overflowing capture is in a branch that is subsequently
371      abandoned after a backtrack.      abandoned after a backtrack.
372    
373  13. In the pathological case when an offset vector of size 2 is used, pcretest  13. In the pathological case when an offset vector of size 2 is used, pcretest
374      now prints out the matched string after a yield of 0 or 1.      now prints out the matched string after a yield of 0 or 1.
375    
376  14. Inlining subpatterns in recursions, when certain conditions are fulfilled.  14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
# Line 61  Version 8.33 xx-xxxx-201x Line 379  Version 8.33 xx-xxxx-201x
379  15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.  15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
380    
381  16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the  16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
382      offset of the starting point of the matching process, provided the offsets      offset of the starting point of the matching process, provided the offsets
383      vector is large enough.      vector is large enough.
384    
385  17. The \A escape now records a lookbehind value of 1, though its execution  17. The \A escape now records a lookbehind value of 1, though its execution
386      does not actually inspect the previous character. This is to ensure that,      does not actually inspect the previous character. This is to ensure that,
387      in partial multi-segment matching, at least one character from the old      in partial multi-segment matching, at least one character from the old
# Line 71  Version 8.33 xx-xxxx-201x Line 389  Version 8.33 xx-xxxx-201x
389      are no lookbehinds in the pattern, \A might match incorrectly at the start      are no lookbehinds in the pattern, \A might match incorrectly at the start
390      of a new segment.      of a new segment.
391    
392    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
393    
394    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
395        gives some modest performance improvement in 8-bit mode.
396    
397    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
398        be expressed in certain programming languages using Universal Character
399        Names.
400    
401    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
402        which points out that "non characters" are not "characters that may not
403        appear in Unicode strings" but rather "characters that are reserved for
404        internal use and have only local meaning".
405    
406    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
407        there was a conditional group that depended on an assertion, if the
408        assertion was false, the callout that immediately followed the alternation
409        in the condition was skipped when pcre_exec() was used for matching.
410    
411    23. Allow an explicit callout to be inserted before an assertion that is the
412        condition for a conditional group, for compatibility with automatic
413        callouts, which always insert a callout at this point.
414    
415    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
416        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
417    
418    25. (*PRUNE) is now supported by the JIT compiler.
419    
420    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
421    
422    27. Fix the case where there are two or more SKIPs with arguments that may be
423        ignored.
424    
425    28. (*SKIP) is now supported by the JIT compiler.
426    
427    29. (*THEN) is now supported by the JIT compiler.
428    
429    30. Update RunTest with additional test selector options.
430    
431    31. The way PCRE handles backtracking verbs has been changed in two ways.
432    
433        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
434        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
435        backtracking. In some cases this makes it more Perl-compatible, but Perl's
436        rather obscure rules do not always do the same thing.
437    
438        (2) Previously, backtracking verbs were confined within assertions. This is
439        no longer the case for positive assertions, except for (*ACCEPT). Again,
440        this sometimes improves Perl compatibility, and sometimes does not.
441    
442    32. A number of tests that were in test 2 because Perl did things differently
443        have been moved to test 1, because either Perl or PCRE has changed, and
444        these tests are now compatible.
445    
446    32. Backtracking control verbs are now handled in the same way in JIT and
447        interpreter.
448    
449    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
450        contained a forward subroutine reference caused a compile error.
451    
452    34. Auto-detect and optimize limited repetitions in JIT.
453    
454    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
455        blocking (*UTF) etc.
456    
457    36. In the interpreter, maximizing pattern repetitions for characters and
458        character types now use tail recursion, which reduces stack usage.
459    
460    37. The value of the max lookbehind was not correctly preserved if a compiled
461        and saved regex was reloaded on a host of different endianness.
462    
463    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
464        of the compiled pattern block, expand the flags field from 16 to 32 bits
465        because it was almost full.
466    
467    39. Try madvise first before posix_madvise.
468    
469    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
470        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
471        original change locked out all matches of empty strings. This has been
472        changed so that one match of an empty string per line is recognized.
473        Subsequent searches on the same line (for colouring or for --only-matching,
474        for example) do not recognize empty strings.
475    
476    41. Applied a user patch to fix a number of spelling mistakes in comments.
477    
478    42. Data lines longer than 65536 caused pcretest to crash.
479    
480    43. Clarified the data type for length and startoffset arguments for pcre_exec
481        and pcre_dfa_exec in the function-specific man pages, where they were
482        explicitly stated to be in bytes, never having been updated. I also added
483        some clarification to the pcreapi man page.
484    
485    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
486        a segmentation fault.
487    
488    
489  Version 8.32 30-November-2012  Version 8.32 30-November-2012
490  -----------------------------  -----------------------------
# Line 1579  Version 7.9 11-Apr-09 Line 1993  Version 7.9 11-Apr-09
1993  7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
1994      doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
1995      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1996      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
1997        8.33.]
1998    
1999  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
2000      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
# Line 1822  Version 7.7 07-May-08 Line 2237  Version 7.7 07-May-08
2237      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2238      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2239      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2240      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2241      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2242      was subsequently set up correctly.)      was subsequently set up correctly.)
2243    

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