Re: A matter of a regular Expression

Hey,

Basically they are same.In that ,different approaches

 ^100(_[0-9]+)?$ use "?" to for zero or 1 occurrence for whole expression
of [0-9]+ for 1 or more occurrences and

u use ^100_[1-9]*$ , "*" as zero or more occurrences

On Mon, Apr 13, 2009 at 4:54 PM, <aly.groupstudy_at_gmail.com> wrote:

> Hello all,
>
> I was working on a task asking to accept only BGP updates from AS100 and
> its
> directly connected AS
>
> Solution guide makes use of this regular expression ^100(_[0-9]+)?$
>
> I used a simpler different solution ^100_[1-9]*$
>
> I think my solution seems to work.
>
> Can anyone confirm the difference between the 2 methods used and if one has
> any
> advantage over the other
>
>
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-- 
Sirus Moghadasian
CCIE #21862 (R&S)
Blogs and organic groups at http://www.ccie.net