can any one give any reffrence to any Doc relating to practice ip as-path access-lists which can provide complete understanding of as-path access lists....
If you mean practicing Regular Expressions, you can use to following links.
Try to understand the concept first and then use EditPad (Last link) to practice them.
You can also use them in google and other search engines. It really helps in building speed/accuracy with them.
very helpfull links thanks so very much msaqi......