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+++ This bug was initially created as a clone of Bug #756675 +++

From upstream <http://bugs.exim.org/show_bug.cgi?id=1179>:

$ pcretest 
PCRE version 8.12 2011-01-15

  re> /ⱥ/8i
data> ⱥ
 0: \x{2c65}
data> Ⱥ
No match
data> Ⱥ_
 0: \x{23a}

The lower-cased variant occupies 3 bytes while the upper-cased variant 2 bytes only. If padding in input exists, the match occurs.

--- Additional comment from ppisar on 2011-12-02 08:06:04 GMT ---

Upstream states this issue has been fixed by commit:

r778 | ph10 | 2011-12-01 18:38:47 +0100 (Thu, 01 Dec 2011) | 3 lines

Fix bug with caseless matching of characters of different lengths when the 
shorter is right at the end of the subject.
-----

RHEL-6 (pcre-7.8-3.1.el6) affected.

Created attachment 539635 [details]
Upstream fix ported to pcre-7.8

Tests on top of patch for bug #756105.

Created attachment 539636 [details]
Test case

This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unfortunately unable to
address this request at this time. Red Hat invites you to
ask your support representative to propose this request, if
appropriate and relevant, in the next release of Red Hat
Enterprise Linux. If you would like it considered as an
exception in the current release, please ask your support
representative.

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.

http://rhn.redhat.com/errata/RHBA-2012-1240.html