gistfile1.py

import os, re, sys

r = re.compile(r'abc xyz = "(.*)"')

def matches(f):
    return ['%s:%s' % (f, m.group(1)) for m in (r.match(l) for l in open(f, "r")) if m]

for fn in (fn for fn in os.listdir(len(sys.argv) > 1 and sys.argv[1] or '.') if os.path.isfile(fn)):
    rc = matches(fn)
    if rc: print "\n".join(rc)