From: Huizinga, Rene (rhuizinga@upcbroadband.com)
Date: Wed Dec 27 2006 - 18:27:48 ART
Hmm, now I see...
Ehrm, not certain if no solution is possible and mention that quickly. If
it's really only for 1 REAL AS-depth behind AS54, how about:
^54(_[0-9]+)\1*$ ?
:)
That would match from left to right:
- Something starting with AS54
- 0 or more instances of something having '_' (space) directly followed with
a set of [0-9] digits immediately behind
- And now comes the trick... The '\1' indicates that it should match (ONLY)
exactely again what it found in the last match between round brackets with
the '*' that it should do this 0 or more times...
It can be that for that last one you also need the '\1' between round
brackets, but would need to check that out in the cmd-reference for
regexp's... But this is what it comes down to...
(So in that case: ^54(_[0-9]+)(\1)*$ )
But check it out yourself, my last bookmark on this was:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_command_refe
rence_chapter09186a00800ca541.html
I'd say, paste it into a few lab-routers and check it out... Either with or
without the round brackets it should work...
Cya
Rene.
P.S.
Even if it's wrong, I'd say 2 points for creativity... ;)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Bit
Gossip
Sent: Wednesday, December 27, 2006 9:29 PM
To: ccielab@groupstudy.com
Subject: RE: BGP Reg Exp
Hi Rene, GS,
the original pb was: match all route of AS54 and its directly attached
customers, where a customer could prepend once or more The trick here is
that you don't know the AS of the customer before hand, so I agree that
unless you list all possible ASs, there is no solution for this problem with
a regular expression....
Luca.
On Wed, 2006-12-27 at 20:48 +0100, Huizinga, Rene wrote:
> Hi Luca,
>
>
> Not certain if I understand your question correctly, but if you want
> to accept all, with AND without prepending, try:
>
> ^54(_1234)+_
>
> Or ONLY when prepended:
>
> ^54(_1234)*_1234_
>
> In my understanding, this should be correct, correct me if I'm wrong
> or please explain your question in case of misunderstandings...
>
>
> Cya
>
> Rene.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Bit Gossip
> Sent: Wednesday, December 27, 2006 8:23 PM
> To: ccielab@groupstudy.com
> Subject: RE: BGP Reg Exp
>
> I was wandering if it is possible to make the expression smarter so
> that it can cope with the customer prepending once or more time;
> something
> like:
> 54 1234 1234 1234
> but not like
> 54 1234 4321
>
> I couldn't come to any solution....
>
> Luca.
>
> On Wed, 2006-12-27 at 09:11 -0500, Scott Morris wrote:
> > Both will work. Yours does 0 or more of the single character 0-9.
> > The first does one or more, but makes the whole thing optional with
> > the ? (0 or
> > 1 of preceeding).
> >
> > Different logic, same result!
> >
> >
> > Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> > JNCIE #153, CISSP, et al.
> > CCSI/JNCI-M/JNCI-J
> > IPExpert VP - Curriculum Development IPExpert Sr. Technical
> > Instructor smorris@ipexpert.com http://www.ipexpert.com
> >
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of JB
> > Sent: Wednesday, December 27, 2006 4:59 AM
> > To: ccielab@groupstudy.com
> > Subject: BGP Reg Exp
> >
> > Hi all, question asks for a router to accept prefixes from BB1 that
> > have been originated by themselves and their directly connected
customers.
> >
> > Solution says: ^54(_[0-9]+)?$
> >
> > I got ^54_[0-9]*$.
> >
> > I ran mine thru looking-glass and it "seems" to work. I would
> > appreciate it if someone could explain the differences, if any,
> > between the two to further my understanding.
> >
> > TIA,
> >
> > JB
> >
> > ____________________________________________________________________
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