Re: Reg Experts!

I can answer (hopefully correct) the first one

deny ^200_300$ the path contains AS 200 followed by 300
deny _200_300$ originate in AS 200 going to As 300

On Wed, Jun 9, 2010 at 1:18 PM, Poplawski, James <
jpoplawski_at_starkinvestments.com> wrote:

> 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 - 14:01:32 ART