Re: A matter of a regular Expression

The 2 are not the same. ^100_[1-9]*$ does the following:

1) Do not match AS100 Only routes.
2) Without a "0" in [1-9], it won't match AS numbers like 300, 500, 405 etc.
3) The * would match everything. AS100's customer's customers and their
customers etc.

HTH
Naveen.

On Sun, Apr 12, 2009 at 11:54 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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>
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Received on Mon Apr 13 2009 - 00:12:26 ART