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A bug in PCRE was causing it to match the wrong substring in regular expressions with empty-matching possessive zero-repeat groups. This problem has been fixed and matching these groups now behaves as expected.
+++ This bug was initially created as a clone of Bug #1119241 +++
The JIT mode and Perl matches like this:
$ printf '%s\n%s\n' '/\A(?:[^"]++|"(?:[^"]*+|"")*+")++/' 'NON QUOTED "QUOT""ED" AFTER "NOT MATCHED' | pcretest -s++
PCRE version 8.33 2013-05-28
re> data> 0: NON QUOTED "QUOT""ED" AFTER (JIT)
data>
While the interpreter mode does not:
$ printf '%s\n%s\n' '/\A(?:[^"]++|"(?:[^"]*+|"")*+")++/' 'NON QUOTED "QUOT""ED" AFTER "NOT MATCHED' | pcretest
PCRE version 8.33 2013-05-28
re> data> 0: NON QUOTED
data>
this is fixed with upstream commit:
commit d27238d61fdbd404b2caa5eac9332cdf76a604fc
Author: ph10 <ph10@2f5784b3-3f2a-0410-8824-cb99058d5e15>
Date: Tue May 27 13:18:31 2014 +0000
Fix empty-matching possessive zero-repeat groups bug.
git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1478 2f5784b3-3f2a-0410-8824-cb99058d5e15
All Fedoras are affected.
----
RHEL-7 is affected (pcre-8.32-12.el7.x86_64).
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2015-2142.html