Regex to validate a twitter url

Question

I'm using the jQuery validation engine to parse my form data: https://github.com/posabsolute/jQuery-Validation-Engine

What would be the regex to validate a twitter URL (including the http://twitter.com part) Eg:

http://twitter.com/barackobama
or
http://twitter.com/#!/barackobama

Answer 1

/(?:http:\/\/)?(?:www\.)?twitter\.com\/(?:(?:\w)*#!\/)?(?:pages\/)?(?:[\w\-]*\/)*([\w\-]*)/

with optional using https or add www e.g

http://twitter.com/example
https://twitter.com/example
http://www.twitter.com/example
https://www.twitter.com/example

is valid

Answer 2

You mean

/http(?:s)?:\/\/(?:www\.)?twitter\.com\/([a-zA-Z0-9_]+)/