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version 1.1.1.4, 2013/07/22 08:25:55 version 1.1.1.5, 2014/06/15 19:46:04
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 ChangeLog for PCRE  ChangeLog for PCRE
 ------------------  ------------------
   
   Version 8.34 15-December-2013
   -----------------------------
   
   1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
       executable memory. Patch inspired by Carsten Klein.
   
   2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
       this macro is never tested and has no effect, because the work to support
       coverage involves only compiling and linking options and special targets in
       the Makefile. The comment in config.h implied that defining the macro would
       enable coverage support, which is totally false. There was also support for
       setting this macro in the CMake files (my fault, I just copied it from
       configure). SUPPORT_GCOV has now been removed.
   
   3.  Make a small performance improvement in strlen16() and strlen32() in
       pcretest.
   
   4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
       detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
       these cases). There was also one in pcretest.c.
   
   5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
   
   6.  In UTF mode, the code for checking whether a group could match an empty
       string (which is used for indefinitely repeated groups to allow for
       breaking an infinite loop) was broken when the group contained a repeated
       negated single-character class with a character that occupied more than one
       data item and had a minimum repetition of zero (for example, [^\x{100}]* in
       UTF-8 mode). The effect was undefined: the group might or might not be
       deemed as matching an empty string, or the program might have crashed.
   
   7.  The code for checking whether a group could match an empty string was not
       recognizing that \h, \H, \v, \V, and \R must match a character.
   
   8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
       an empty string. If it can, pcretest shows this in its information output.
   
   9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
       that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
       matched by pcre_exec() without using JIT:
   
       (a) If the rest of the pattern did not match after a maximal run of
           grapheme clusters, the code for backing up to try with fewer of them
           did not always back up over a full grapheme when characters that do not
           have the modifier quality were involved, e.g. Hangul syllables.
   
       (b) If the match point in a subject started with modifier character, and
           there was no match, the code could incorrectly back up beyond the match
           point, and potentially beyond the first character in the subject,
           leading to a segfault or an incorrect match result.
   
   10. A conditional group with an assertion condition could lead to PCRE
       recording an incorrect first data item for a match if no other first data
       item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
       first data item, and therefore matched "ca" after "c" instead of at the
       start.
   
   11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
       bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
   
   12. The source of pcregrep now includes z/OS-specific code so that it can be
       compiled for z/OS as part of the special z/OS distribution.
   
   13. Added the -T and -TM options to pcretest.
   
   14. The code in pcre_compile.c for creating the table of named capturing groups
       has been refactored. Instead of creating the table dynamically during the
       actual compiling pass, the information is remembered during the pre-compile
       pass (on the stack unless there are more than 20 named groups, in which
       case malloc() is used) and the whole table is created before the actual
       compile happens. This has simplified the code (it is now nearly 150 lines
       shorter) and prepared the way for better handling of references to groups
       with duplicate names.
   
   15. A back reference to a named subpattern when there is more than one of the
       same name now checks them in the order in which they appear in the pattern.
       The first one that is set is used for the reference. Previously only the
       first one was inspected. This change makes PCRE more compatible with Perl.
   
   16. Unicode character properties were updated from Unicode 6.3.0.
   
   17. The compile-time code for auto-possessification has been refactored, based
       on a patch by Zoltan Herczeg. It now happens after instead of during
       compilation. The code is cleaner, and more cases are handled. The option
       PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
       options in pcretest are provided to set it. It can also be set by
       (*NO_AUTO_POSSESS) at the start of a pattern.
   
   18. The character VT has been added to the default ("C" locale) set of
       characters that match \s and are generally treated as white space,
       following this same change in Perl 5.18. There is now no difference between
       "Perl space" and "POSIX space". Whether VT is treated as white space in
       other locales depends on the locale.
   
   19. The code for checking named groups as conditions, either for being set or
       for being recursed, has been refactored (this is related to 14 and 15
       above). Processing unduplicated named groups should now be as fast at
       numerical groups, and processing duplicated groups should be faster than
       before.
   
   20. Two patches to the CMake build system, by Alexander Barkov:
   
         (1) Replace the "source" command by "." in CMakeLists.txt because
             "source" is a bash-ism.
   
         (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
             without these the CMake build does not work on Solaris.
   
   21. Perl has changed its handling of \8 and \9. If there is no previously
       encountered capturing group of those numbers, they are treated as the
       literal characters 8 and 9 instead of a binary zero followed by the
       literals. PCRE now does the same.
   
   22. Following Perl, added \o{} to specify codepoints in octal, making it
       possible to specify values greater than 0777 and also making them
       unambiguous.
   
   23. Perl now gives an error for missing closing braces after \x{... instead of
       treating the string as literal. PCRE now does the same.
   
   24. RunTest used to grumble if an inappropriate test was selected explicitly,
       but just skip it when running all tests. This make it awkward to run ranges
       of tests when one of them was inappropriate. Now it just skips any
       inappropriate tests, as it always did when running all tests.
   
   25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
       character types such as \d or \w, too many callouts were inserted, and the
       data that they returned was rubbish.
   
   26. In UCP mode, \s was not matching two of the characters that Perl matches,
       namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
       were matched by \h. The code has now been refactored so that the lists of
       the horizontal and vertical whitespace characters used for \h and \v (which
       are defined only in one place) are now also used for \s.
   
   27. Add JIT support for the 64 bit TileGX architecture.
       Patch by Jiong Wang (Tilera Corporation).
   
   28. Possessive quantifiers for classes (both explicit and automatically
       generated) now use special opcodes instead of wrapping in ONCE brackets.
   
   29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
       (because it's meaningless), this was not happening when PCRE_CASELESS was
       set. Not wrong, but inefficient.
   
   30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
       properties for \w, \d, etc) is present in a test regex. Otherwise if the
       test contains no characters greater than 255, Perl doesn't realise it
       should be using Unicode semantics.
   
   31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
       [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
       does in Unicode mode.
   
   32. Added the "forbid" facility to pcretest so that putting tests into the
       wrong test files can sometimes be quickly detected.
   
   33. There is now a limit (default 250) on the depth of nesting of parentheses.
       This limit is imposed to control the amount of system stack used at compile
       time. It can be changed at build time by --with-parens-nest-limit=xxx or
       the equivalent in CMake.
   
   34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
       errors. Perl warns for these when in warning mode, but PCRE has no facility
       for giving warnings.
   
   35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
       However, this was not working for (?!) because it is optimized to (*FAIL),
       for which PCRE does not allow quantifiers. The optimization is now disabled
       when a quantifier follows (?!). I can't see any use for this, but it makes
       things uniform.
   
   36. Perl no longer allows group names to start with digits, so I have made this
       change also in PCRE. It simplifies the code a bit.
   
   37. In extended mode, Perl ignores spaces before a + that indicates a
       possessive quantifier. PCRE allowed a space before the quantifier, but not
       before the possessive +. It now does.
   
   38. The use of \K (reset reported match start) within a repeated possessive
       group such as (a\Kb)*+ was not working.
   
   40. Document that the same character tables must be used at compile time and
       run time, and that the facility to pass tables to pcre_exec() and
       pcre_dfa_exec() is for use only with saved/restored patterns.
   
   41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
       features for Builds with MSVC:
   
       1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
          builds). The .rc files can be used to set FileDescription and many other
          attributes.
   
       2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
          This allows higher-level build scripts which want .pdb files to avoid
          hard-coding the exact files needed."
   
   42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
       mean "start of word" and "end of word", respectively, as a transition aid.
   
   43. A minimizing repeat of a class containing codepoints greater than 255 in
       non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
       compiled to use the heap for recursion.
   
   44. Got rid of some compiler warnings for unused variables when UTF but not UCP
       is configured.
   
   
 Version 8.33 28-May-2013  Version 8.33 28-May-2013
--------------------------------------------------
   
 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
     avoid compiler signed/unsigned warnings. Added (int) casts to unsigned      avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
Removed from v.1.1.1.4  
changed lines
  Added in v.1.1.1.5

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