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Previously, non-matched groups within capturing groups up to a forced match were not being properly reset by PCRE, causing the library to incorrectly match some groups. With this update, non-matched groups within capturing groups up to a forced match are being properly marked as non-matching.
+++ This bug was initially created as a clone of Bug #1161587 +++
As reported to upstream <http://bugs.exim.org/show_bug.cgi?id=1537>:
$ pcretest
PCRE version 8.36 2014-09-26
re> /(?:((abcd))|(((?:(?:(?:(?:abc|(?:abcdef))))b)abcdefghi)abc)|((*ACCEPT)))/
data> 1234abcd
0:
1:
2:
3:
4:
5:
data>
Which should return "unset" groups 1--4. The library forgets to set those offsets to -1.
Fixed by upstream:
commit e2eeaf85f1b5d6c4669b621d309ff904cbf96f4b
Author: ph10 <ph10@2f5784b3-3f2a-0410-8824-cb99058d5e15>
Date: Wed Nov 5 15:08:03 2014 +0000
Fix bug when there are unset groups prior to (*ACCEPT) within a capturing
group.
git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1510 2f5784b3-3f2a-0410-8824-cb99058d5e15
[...]
--- Additional comment from Petr Pisar on 2014-11-07 12:28:00 GMT ---
Simpler reproducer:
Was:
re> /(x)|((*ACCEPT))/
data> abcd
0:
1:
2:
Should be:
re> /(x)|((*ACCEPT))/
data> abcd
0:
1: <unset>
2:
data>
----
RHEL-7 is affected (pcre-8.32-13.el7).
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