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[Emacs-bug-tracker] bug#5812: marked as done (expr: Difference in behavi

From: GNU bug Tracking System
Subject: [Emacs-bug-tracker] bug#5812: marked as done (expr: Difference in behavior of match and :)
Date: Mon, 05 Apr 2010 04:43:02 +0000

Your message dated Sun, 4 Apr 2010 22:42:13 -0600
with message-id <address@hidden>
and subject line Re: bug#5812: expr: Difference in behavior of match and :
has caused the GNU bug report #5812,
regarding expr: Difference in behavior of match and :
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

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5812: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=5812
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--- Begin Message --- Subject: expr: Difference in behavior of match and : Date: Wed, 31 Mar 2010 18:35:16 +0530

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

To my knowledge it should not able to extract ADILM as the regex does not include uppercase letters (A-Z).

In the expr man page it is mentioned that:

 same as STRING : REGEXP

So i tried following snippet:-

-bash-3.1$ userid=`expr match "uid=11008(ADILM) gid=1200(cvs),1400(build)"  ".*uid=[0-9]*(\(.[0-9a-z]*\)) .*"`
-bash-3.1$ echo $userid


I changed the regex and added uppercase letters:-
-bash-3.1$ userid=`expr match "uid=11008(ADILM) gid=1200(cvs),1400(build)"  ".*uid=[0-9]*(\(.[0-9A-Za-z]*\)) .*"`
-bash-3.1$ echo $userid

So it means that match is not same as ":". As per observation ":" uses case-insensitive matching while match is strict case sensitive matching.

Can you update the man page OR let me know if i am doing anything wrong?

-bash-3.1$ rpm -qf /usr/bin/expr

Thanks and Regards,
Adil Mujeeb

--- End Message ---
--- Begin Message --- Subject: Re: bug#5812: expr: Difference in behavior of match and : Date: Sun, 4 Apr 2010 22:42:13 -0600 User-agent: Mutt/1.5.18 (2008-05-17)
Adil Mujeeb wrote:
> Thanks Bob for such a nice explanation and your instinct is right. It is
> locale problem.
> ...
> And the other point you made is also right. I didn’t realize that I was
> using another session for comparing the result with match which ahs
> different locale:-

I thought it might have been something like that.

> I never knew that locale has effect on the behavior. We can close this bug.

I will close the bug with this message then.

> Thank you so much for your time and details, I have learnt new thing :)

I am glad to have helped!

> Also, thanks for correcting my regex.

Sure thing!


--- End Message ---

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