question about regular expressions

[west33637]

ip as-path access-list 1 permit _\(65301\)

Hello all. Will the above regexp capture all prefixes originating from confederation peer AS 65301?

If not, what is the correct syntax?

Thanks,

[Sunil Bhadauria]

Hello ,

To match prefixes only originating from concerned confederation you can use below regular prefix :

Ip as-path access-list 1 permit  65301\)$ 

This will get you desired results .

Regards

Sunil Bhadauria 

[west33637]

Hello Sunil. Thanks for the response. Did you verify this works? I will verify over the weekend in my lab.

[Sunil Bhadauria · Accepted solution]

Hello ,

yes i did test this , when I test using _\(65301\) or ^\(65301\) or \(65301\) it was only matching prefixes generated by directly connected confederation peer AS ( 65301) .

I understand this happens because escape character (\) is supposed to match special character . and for the matter of fact I also achieved desired results using regular expression 65301\)

HTH 

Sunil Bhadauria