e-mail syntaktisch prüfen

# Checks for correctness of an E-Mail address
 
import re
 
def checkEmail(email):
  RC_EMAIL_OK       = 0   # E-Mail is correct
  RC_EMAIL_ERROR    = 1   # E-Mail is semantically wrong
 
  # RegEx to check the semantic of the e-mail address
  EMAIL_REGEX = r"[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?"
  if (re.match(EMAIL_REGEX, email.lower())):
    return RC_EMAIL_OK
  else:
    return RC_EMAIL_ERROR
 
result = checkEmail("test@example.org")
print result