Parses text to find emails, accepts text files or raw input

extemail.py

import re
import sys

# Email regex taken from django/django 
# https://github.com/django/django/blob/master/django/core/validators.py#L137
email_re = re.compile(
            r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*"  # dot-atom
            r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*"' # quoted-string
            r')@(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+[A-Z]{2,6}\.?$', re.IGNORECASE) 

def parse_emails(string):
    words =  string.split()
    find_emails = map(email_re.match, words)
    matched_emails = filter(bool, find_emails)
    processed_emails = map(lambda email: email.string, matched_emails)
    return processed_emails

if __name__=='__main__':
    try: 
        filename = sys.argv[1]
    except IndexError:
        filename = '' 
    if filename:
        with open(filename, 'rU') as f:
            bucket = []
            for line in f:
                bucket += parse_emails(line)
            print list(bucket)
    else:
        print 'Please use Ctrl-C to quit' 
        while True:
            from_user = raw_input('paste text here to extract emails: ')
            print parse_emails(from_user)