^54(_[0-9]+)?$ or ^54(_[0-9]+)*$ or something else

From: CharlesB (cbalik@adelphia.net)
Date: Thu Aug 24 2006 - 18:04:48 ART

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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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