RE: Reg Experts!

Sorry on the third and sixth I assume you meant \ in front of 1. \ means
that the following character is the literal character. This is frequently
used when you have special characters like * . $ () etc. When you first
escape these characters with the \. then it is going to look for a period
and not any character. \(\) means that it looks for parenthesis in the
regular expression instead of saying anything inside this.

Regards,
 
Tyson Scott - CCIE #13513 R&S, Security, and SP
Managing Partner / Sr. Instructor - IPexpert, Inc.
Mailto: tscott_at_ipexpert.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Poplawski, James
Sent: Wednesday, June 09, 2010 1:19 PM
To: 'ccielab_at_groupstudy.com'
Subject: Reg Experts!

Just going through Narbik's Regular Expression listings and using INE
"Understanding BGP Regular Expressions" for reference.

I have some questions if anyone can explain in people terms. Here goes.

What's the difference between?
       deny ^200_300$
       deny _200_300$

       ^([0-9]+)?$
       ^([0-9]+)(_1\)*$

       _100+
       ^([0-9]+)(_\1)*$

In regards to ^([0-9]+)(_\1)*$ why is the number 1 chosen? Why have it at
all? Why not have a 0 or a 2 in there? I'm still looking through
documentation on \.

Any help is appreciated, thanks!
JB

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Received on Wed Jun 09 2010 - 15:14:56 ART