extract username from twitter url

extract_username_twitter.py

import re

strings = [
"http://www.twitter.com/#!/donttrythis",
"http://twitter.com/KimKardashian",
"http://www.twitter.com/#!/KourtneuyKardash/following",
"http://twitter.com/#!/jasonterry31/lists/memberships",

]

username_pattern = re.compile("(https://|http://)?(www\.)?twitter\.com/(#!/)?(\w+)*")

for string_tomatch in strings:
    result = username_pattern.match(string_tomatch)
    print(result.group(4))