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From: "valery_reznic at yahoo dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs-regex@sources.redhat.com
Subject: [Bug regex/14301] New: Regular expression wrong match with a number of groups
Date: Wed, 27 Jun 2012 07:26:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14301

             Bug #: 14301
           Summary: Regular expression wrong match with a number of groups
           Product: glibc
           Version: 2.11
            Status: NEW
          Severity: normal
          Priority: P2
         Component: regex
        AssignedTo: unassigned@sourceware.org
        ReportedBy: valery_reznic@yahoo.com
                CC: drepper.fsp@gmail.com
    Classification: Unclassified


Created attachment 6487
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6487
test program for bug demonstration

I compile regular expression with REG_EXTENDED | REG_ICASE (see attached
program)
Then run it as following:

(First parameter - regular expression, second - text to match)

1. ./r '[ ](4[0-9]{15})|(4[0-9]{12})[ ]'       ' 4123456789012 ' - match
2. ./r '[ ](4[0-9]{15})|(4[0-9]{12})[ ]'       'r4123456789012'  - no match
3. ./r '[ ](4[0-9]{15})|(4[0-9]{12})|(AAA)[ ]' 'r4123456789012'  - match
4. ./r '[ ](4[0-9]{12})|(4[0-9]{15})|(AAA)[ ]' 'r4123456789012'  - no-match

1. Match, as expected - second group (4[0-9]{12})
2. No, match as expected.
3. Match, when should not be
4. Just for interest - swap second and first group 4[0-9]{12} and 4[0-9]{15}
   and all of sudden it works as expected.

Attached program can be compiled with

gcc -Wall r.c -o r

I tested it on systems with following glibc versions:
- 2.3.2 Fedora Core 1, both i386 and x86-64
- 2.11  Fedora 12 - x86-64
- 2.5   CentOS release 5.6 (Final) - i386

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