Parse American phone numbers, with optional extension

ParsePhoneNumber.py

import re

phonePattern = re.compile(r'''
(\d{3})     #area code
\D* 
(\d{3})     #trunk
\D*
(\d{4})     #number
\D*
(\d*)       #optional extension
$
''', re.VERBOSE)

print phonePattern.search('800-810-6666-1234').groups()
print phonePattern.search('800.810.6666').groups()
print phonePattern.search('1-(800).810.6666').groups()