Regular Expressions..

Hey guys,

I just started reading the Cisco LAN switching handbook in preparation for my CCNP:Switch exam. Early on I discover that you can use regular expressions in your piped show run output. I frequently use begin and include but I have no idea how to look for anything more complicated than a simple string.

Can anyone point me to a good tutorial on this? I suppose it's regular regular expressions just like from Linux, but what I have tried so far doesn't work.

Thanks in advance!

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gaby_978

I recently learned that you can also use ( | ex ) to exclude certain outputs.

QHalo

Cisco Application Velocity System User Guide (Software Version 5.0) - Regular Expressions [Cisco AVS 3100 Series Application Velocity System] - Cisco Systems

Using Regular Expressions on Cisco IOS | Router Jockey

http://www.cisco.com/en/US/docs/ios/12_2/termserv/configuration/guide/tcfaapre.pdf

tndfr

Cisco IOS uses the same concept of regular expressions just like any other scripting language such as Perl, php, python etc....

lets say you want to list all references to an ip address (regardless) on a config file

show run | include ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)

hasitha257

The best use of regular expressions is in BGP ( Filter list etc...)

dynamik

Must read: Amazon.com: Mastering Regular Expressions (9780596528126): Jeffrey E.F. Friedl: Books

Yahel

dynamik wrote: »

Must read: Amazon.com: Mastering Regular Expressions (9780596528126): Jeffrey E.F. Friedl: Books

That looks like a cool book

Thanks