E.164 phone number validator

phone_validator.py

import re

# Validates whether a phone number is in E.164 (https://en.wikipedia.org/wiki/E.164)
# format.
# 
# Sample usage:
# 
#   >>> is_e164('55 (12) 98154-1281')
#   True
# 
#   >>> is_e164('800 555 2233')
#   True
# 
#   >>> is_e164('0800 123 4567')
#   False
# 
def is_e164(number):
    exp = re.compile('\+?[1-9]\d{1,14}')
    number = ''.join(c for c in number if c.isdigit())

    return exp.match(number) is not None