From: Swink, Dave (DSwink@protrader.com)
Date: Fri Feb 21 2003 - 14:36:54 GMT-3
Cezar,
That answer matches "AS123 (any number of additional ASs) AS456" or "AS456
(any number of additional ASs) AS123" but it does not match "AS123 AS456" or
"AS456 AS123". That is why it needs the ? after the .* to give it the "or
nothing" option: _123_(.*)?_456|456_(.*)?_123
Dave Swink
-----Original Message-----
From: Cezar Fistik [mailto:cfistik@moldovacc.md]
Sent: Friday, February 21, 2003 6:28 AM
To: ccielab@groupstudy.com
Subject: Re: Re:
Hi all,
Just realized it is not good. The expression 123.*456 would match also
AS1234 and/or AS3456 and so on, that is not the desired result. It also
wouldn't match AS-PATHS when AS456 is before AS123, so here comes a little
improvment:
_123_.*_456|456_.*_123
What do you think?
Cezar Fistik
----- Original Message -----
From: "Cezar Fistik" <cfistik@moldovacc.md>
To: <ccielab@groupstudy.com>
Sent: Friday, February 21, 2003 1:23 AM
Subject: Re:
> Hi,
>
> I don't know if there si an "and" in regular expressions, never heard of
> it. In order to match AS123 AND AS456 you can try using the following
> expressoin:
>
> 123.*456
>
> Regards,
> Cezar Fistik
>
> ----- Original Message -----
> From: "Ram Shummoogum" <rshummoo@ca.ibm.com>
> To: <ccielab@groupstudy.com>
> Sent: Thursday, February 20, 2003 10:34 PM
>
>
> > Hi ALL:
> >
> >
> > I need some help on this BGP regular expression.
> >
> >
> > Make a router only accept routes that has transit AS 123 and AS 456.
The
> > keyword here is "and" and not or.
> >
> >
> > Ex: {34 5 6 456 7 99 123 88}
> > {45 123 89 456 7}
> >
> >
> >
> >
> >
> > I know "OR" is | but what is AND.
> >
> >
> >
> >
> >
> > Thanks for your help
> >
> >
> > RAM
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