GNU bug report logs - #5812
expr: Difference in behavior of match and :

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From: Eric Blake <eblake <at> redhat.com>
To: Adil Mujeeb <mujeeb.adil <at> gmail.com>
Cc: 5812 <at> debbugs.gnu.org
Subject: bug#5812: expr: Difference in behavior of match and :
Date: Wed, 31 Mar 2010 15:48:56 -0600

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On 03/31/2010 07:05 AM, Adil Mujeeb wrote:
> Hello team,
> 
> I have tried following snippet in a bash script:
> 
> -bash-3.1$userid=`expr "uid=11008(ADILM) gid=1200(cvs),1400(build)" :
> ".*uid=[0-9]*(\(.[0-9a-z]*\)) .*"`
> -bash-3.1$echo $userid
> ADILM
> -bash-3.1$

I cannot repeat your results with 7.6 (the version in fedora 12) or the
latest coreutils.git.

$ expr "uid=11008(ADILM) gid=1200(cvs),1400(build)" : \
   ".*uid=[0-9]*(\(.[0-9a-z]*\)) .*"

$ expr "uid=11008(ADILM) gid=1200(cvs),1400(build)" : \
   ".*uid=[0-9]*(\(.[0-9a-zA-Z]*\)) .*"
ADILM

Perhaps you have a locale issue at play?

> -bash-3.1$ rpm -qf /usr/bin/expr
> coreutils-5.97-12.1.el5

That's rather old.  Perhaps it might be a bug that has been fixed in the
meantime, in which case, you would want to upgrade to 8.4.

At any rate, there's nothing in the source code that introduces any case
insensitivity, and the documentation is correct, that match and : behave
identically.

-- 
Eric Blake   eblake <at> redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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