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 News about PCRE releases  News about PCRE releases
 ------------------------  ------------------------
   
   Release 8.34 15-December-2013
   -----------------------------
   
   As well as fixing the inevitable bugs, performance has been improved by
   refactoring and extending the amount of "auto-possessification" that PCRE does.
   Other notable changes:
   
   .  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.
   
   .  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.
   
   .  Unicode character properties were updated from Unicode 6.3.0.
   
   .  The character VT has been added to the 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".
   
   .  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.
   
   .  Following Perl, added \o{} to specify codepoints in octal, making it
      possible to specify values greater than 0777 and also making them
      unambiguous.
   
   .  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.
   
   .  Add JIT support for the 64 bit TileGX architecture.
   
   .  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.
   
   .  Perl no longer allows group names to start with digits, so I have made this
      change also in PCRE.
   
   .  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.
   
   
   Release 8.33 28-May-2013
   --------------------------
   
   A number of bugs are fixed, and some performance improvements have been made.
   There are also some new features, of which these are the most important:
   
   .  The behaviour of the backtracking verbs has been rationalized and
      documented in more detail.
   
   .  JIT now supports callouts and all of the backtracking verbs.
   
   .  Unicode validation has been updated in the light of Unicode Corrigendum #9,
      which points out that "non characters" are not "characters that may not
      appear in Unicode strings" but rather "characters that are reserved for
      internal use and have only local meaning".
   
   .  (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
      creator of a pattern can specify lower (but not higher) limits for the
      matching process.
   
   .  The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
      the (*UTF) feature, as this could be a security issue.
   
   
   Release 8.32 30-November-2012
   -----------------------------
   
   This release fixes a number of bugs, but also has some new features. These are
   the highlights:
   
   .  There is now support for 32-bit character strings and UTF-32. Like the
      16-bit support, this is done by compiling a separate 32-bit library.
   
   .  \X now matches a Unicode extended grapheme cluster.
   
   .  Case-independent matching of Unicode characters that have more than one
      "other case" now makes all three (or more) characters equivalent. This
      applies, for example, to Greek Sigma, which has two lowercase versions.
   
   .  Unicode character properties are updated to Unicode 6.2.0.
   
   .  The EBCDIC support, which had decayed, has had a spring clean.
   
   .  A number of JIT optimizations have been added, which give faster JIT
      execution speed. In addition, a new direct interface to JIT execution is
      available. This bypasses some of the sanity checks of pcre_exec() to give a
      noticeable speed-up.
   
   .  A number of issues in pcregrep have been fixed, making it more compatible
      with GNU grep. In particular, --exclude and --include (and variants) apply
      to all files now, not just those obtained from scanning a directory
      recursively. In Windows environments, the default action for directories is
      now "skip" instead of "read" (which provokes an error).
   
   .  If the --only-matching (-o) option in pcregrep is specified multiple
      times, each one causes appropriate output. For example, -o1 -o2 outputs the
      substrings matched by the 1st and 2nd capturing parentheses. A separating
      string can be specified by --om-separator (default empty).
   
   .  When PCRE is built via Autotools using a version of gcc that has the
      "visibility" feature, it is used to hide internal library functions that are
      not part of the public API.
   
   
   Release 8.31 06-July-2012
   -------------------------
   
   This is mainly a bug-fixing release, with a small number of developments:
   
   . The JIT compiler now supports partial matching and the (*MARK) and
     (*COMMIT) verbs.
   
   . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
     pattern.
   
   . There should be a performance improvement when using the heap instead of the
     stack for recursion.
   
   . pcregrep can now be linked with libedit as an alternative to libreadline.
   
   . pcregrep now has a --file-list option where the list of files to scan is
     given as a file.
   
   . pcregrep now recognizes binary files and there are related options.
   
   . The Unicode tables have been updated to 6.1.0.
   
   As always, the full list of changes is in the ChangeLog file.
   
   
 Release 8.30 04-February-2012  Release 8.30 04-February-2012
 -----------------------------  -----------------------------
   
Line 525  some of the new functionality in Perl 5.005. Line 662  some of the new functionality in Perl 5.005.
 Another (I hope this is the last!) change has been made to the API for the  Another (I hope this is the last!) change has been made to the API for the
 pcre_compile() function. An additional argument has been added to make it  pcre_compile() function. An additional argument has been added to make it
 possible to pass over a pointer to character tables built in the current  possible to pass over a pointer to character tables built in the current
locale by pcre_maketables(). To use the default tables, this new arguementlocale by pcre_maketables(). To use the default tables, this new argument
 should be passed as NULL.  should be passed as NULL.
   
           IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05            IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
Removed from v.1.1.1.2  
changed lines
  Added in v.1.1.1.5

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