def find_uri(which = 0)
      which = scan(sf_regex(:uri))[which.to_i][0]
      which =~ sf_regex(:protocol) ? which : "http://#{which}"
    rescue NoMethodError
      nil
    end
def find_uri(which = 0)
      which = scan(sf_regex(:uri))[which.to_i][0]
      which =~ sf_regex(:protocol) ? which : "http://#{which}"
    rescue NoMethodError
      nil
    end
Find URIs in the String.

 Example:
   >> 'Wow! What an awesome site: http://adtangerine.com!'.find_uri
   => 'http://adtangerine.com'
   >> 'Very cool: http://adtangerine.com and www.twitflink.com'.find_uri 1
   => 'www.twitflink.com'
 Arguments:
   which: (Integer)
     - Which URI in the String: first (0), second (1) and so on.