RE: Reg Experts!

I thought it was matching 100 or any combination of 100, IE 100 100 100 100 in the case of prepending.

The _100+ worked for my lab to allow the 100's through (9 of them prepended) however the solution had the crazy ^([0-9]+)(_\1)*$ sequence for solution.

-----Original Message-----
From: Jack Router [mailto:pan.router_at_gmail.com]
Sent: Wednesday, June 09, 2010 2:22 PM
To: 'Tyson Scott'; Poplawski, James; ccielab_at_groupstudy.com
Subject: RE: Reg Experts!

What about 5th: _100+
Should it be: begins with 100 and has any number of 0s after it ?

As per DOC CD:
+ Matches one or more sequences of the character preceding the plus sign.

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Tyson Scott
Sent: 9-Jun-10 15:12
To: 'Poplawski, James'; ccielab_at_groupstudy.com
Subject: RE: Reg Experts!

James,

The first will deny only if the last AS in the path was 200
The second will deny if in the path 200 and originated in 300 but may have
additional AS's as well first.
The first one only allows two AS

The third will allow either 1 AS in the path or Null (Meaning local AS
prefixes.)
The fourth will match if 1 AS is in the path or if 1 AS plus the as 1 as the
originator in the path

The fifth is an AS that begins with 100 and has any numbers after it.
The sixth is the same as the third

Regards,

Tyson Scott - CCIE #13513 R&S, Security, and SP
Managing Partner / Sr. Instructor - IPexpert, Inc.
Mailto: tscott_at_ipexpert.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Poplawski, James
Sent: Wednesday, June 09, 2010 1:19 PM
To: 'ccielab_at_groupstudy.com'
Subject: Reg Experts!

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 - 14:25:31 ART