This is called a "regular expression".
In BGP is used for route filtering in ip as-path access-lists.
Check this out to learn more about regular expressions:
Well, I guess the intent of the post above was to provide you a way to learn regular expression basic, so you could understand by yourself what it means. And a next time, you don't depend by anybody to do your work.
Thank you for your supporting contribution!
I see your mind is set on helping people learn and understand the technology.
dandy i am clear about reg expression but not able to break the above mentioned. It will definately behelpful to me if you clear the meanings.
Thanks medan this is what actually i am looking for.
so it means any network that is directly connected to 4 and so on.
Please answer one more after that i will rate you.Donot take it otherwise i am joking.
I think that is an invalid regular expression.
If you have a router connected to internet running BGP, you can check it by yourself by executing "show ip bgp regexp [user_regular_expression]".
Else, you can use any BGP Looking Glass that allows you to do that. i.e. you can use RIPE-NCC Looking Glass http://www.ris.ripe.net/cgi-bin/lg/index.cgi
Never mind the rating, I can go to the barber, they give free candy for every hair-cut.