gistfile1.txt

#!/usr/bin/python

import sys
import re

bug_pattern = re.compile(r'bug \d+', flags=re.IGNORECASE)

for line in sys.stdin:
  commit_msg = line.strip()
  bug_msg = bug_pattern.findall(commit_msg)
  if bug_msg is None:
    print 'missing bug line: %s' % commit_msg
  else:
    bug_nums = [x[0] for x in bug_msg]
    print bug_nums