import re
def test():
text = \
''' You can contact us at myname@server.site.com
or at yourname AT server DOT site DOT com.
Also at o u r n a m e @ s e r v e r dot s i t e dot c o m
and t.h.e.i.r.n.a.m.e at server dot s/i/t/e DOT COM.
'''
for email in emailLeech(text): print email
DOMAINS = ["com","edu","net","org","gov","us"] #.. and so on
FLAGS = re.IGNORECASE | re.VERBOSE
AT = r'(?: @ | \b A \s* T \b)'
ADDRESSPART = r'\b (?: \w+ | \w (?:(?:\s+|\W) \w)*) \b'
DOMAIN = r'(?:%s)' % '|'.join(["(?:\s*|\W)".join(domain) for domain in DOMAINS])
NONWORD = re.compile(r'\W+')
DOT_REGEX = re.compile(r'(?: \. | \b D \s* O \s* T \b)', FLAGS)
EMAIL_REGEX = re.compile(
(r'(?P<name>%s) \W* %s \W*' % (ADDRESSPART,AT)) +
r'(?P<site>(?: %s \W* %s \W*)+)' % (ADDRESSPART, DOT_REGEX.pattern) +
r'(?P<domain>%s)' % DOMAIN, FLAGS)
def emailLeech(text):
''' An iterator over recognized email addresses within text'''
while (True):
match = EMAIL_REGEX.search(text)
if not match: break
parts = [match.group("name")] + \
DOT_REGEX.split(match.group("site")) + \
[match.group("domain")]
# discard non word chars
parts = [NONWORD.sub('',part) for part in parts]
# discard all empty parts and make lowercase
parts = [part.lower() for part in parts if len(part)>0]
# join the parts
yield "%s@%s.%s" % (parts[0], '.'.join(parts[1:-1]), parts[-1])
text = text[match.end():]
if __name__ == '__main__': test()
