Check how many 'likes' a website's got if it uses Facebook like button

fb_likes.py

import urllib
import re
import sys

def fb_likes(url):
  html = urllib.urlopen(url).read()
  has_fb = re.search('<iframe src=\"http\:\/\/www.facebook.com', html)
  if has_fb:
    fb_iframe_url = re.search('<iframe src="(http\:\/\/www.facebook.com\S+)"', html).group(1)
    fb_html = urllib.urlopen(fb_iframe_url).read()
    likes = re.search('(\d+) like', fb_html)
    if likes:
      return likes.group(1)
    
def main():
    if len(sys.argv)>1:
        res = fb_likes(sys.argv[1])
        if res:
          print res
        else:
          print 'Couldn\'t found Facebook Like widget'
            

if __name__ == '__main__':
    main()