From: Guzman, Chris (Chris.Guzman@McKesson.com)
Date: Thu Aug 24 2006 - 21:09:52 ART
^54_[0-9]*$ would be the correct one.
The * matches 0 or more sequences of the atom.
The + matches 1 or more sequences of the atom.
So if you use +, in your expression it will not match the case of just
AS 54.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
CharlesB
Sent: Thursday, August 24, 2006 2:05 PM
To: ccielab@groupstudy.com
Subject: ^54(_[0-9]+)?$ or ^54(_[0-9]+)*$ or something else
Guys,
I am kind of confused between +,?,* regular expressions.
Let's say we are looking for AS 54 and its directly connected ASs:
1 ) For "54 X" , X is one digit or multiple
^54_[0-9]+$
or
^54_[0-9]*$
I think both will be matching.
2) For "54 X X X"
If directly connected customer's AS is prepending
^54(_[0-9]+)?$ will only match "54 X"
^54(_[0-9]+)*$ will match both "54 X" and "54 X X X", am I getting this
correctly?
I am looking for the expression best match for the "54 X X X", this is
the
question I have.
Thanks for any help in advance.
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