Python's for/while else loops

loops.py

# 15-19 validate US telephone numbers with optional area code
# 800-555-1212, 555-1212, and also (800) 555-1212
regex = re.compile(r'(\d{3}-|\(\d{3}\)\s)?\d{3}-\d{4}')
for s in ['800-555-1212', '555-1212', '(800) 555-1212']:
  match = re.match(regex, s)
  if not match:
    print 'Error! %s should be a valid telephone number' % s
    break
else:
  print 'All telephone numbers are valid, yey!'