Find URLs with underscores

gistfile1.py

import re

def find_underscores(patterns):
    for pattern in patterns:
        raw = pattern.regex.pattern
        rr = re.sub('\(.*?\)', lambda x: '', raw)
        if '_' in rr: 
            print pattern.regex.pattern
        if hasattr(pattern, 'url_patterns'):
            find_underscores(pattern.url_patterns)

from urls import urlpatterns
find_underscores(urlpatterns)