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+++ This bug was initially created as a clone of Bug #1111054 +++

This should match:

$ printf '%s\n%s\n' '/[\Qa]\E]+/' 'a' | ./pcretest -d
PCRE version 8.35 2014-04-04

  re> ------------------------------------------------------------------
  0   7 Bra
  3     a
  5     ]++
  7   7 Ket
 10     End
------------------------------------------------------------------
Capturing subpattern count = 0
No options
First char = 'a'
Need char = ']'
data> No match
data> 

Upstream fixed it by:

commit 8d8c3dbadff3d0735ba696acf211c14b3025622f
Author: ph10 <ph10@2f5784b3-3f2a-0410-8824-cb99058d5e15>
Date:   Wed Jun 18 17:17:03 2014 +0000

    Fix bad compile of [\Qx]...  where x is any character.
    
    
    git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1487 2f5784b3-3f2a-0410-8824-cb99058d5e15

----
RHEL-7 is affected (pcre-8.32-12.el7.x86_64)

Created attachment 910300 [details]
Upstream fix ported to 8.32

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