Checking validity of email in django/python [duplicate]

from django.core.exceptions import ValidationErrorfrom django.core.validators import validate_emailvalue = "foo.bar@baz.qux"try:    validate_email(value)except ValidationError as e:    print("bad email, details:", e)else:    print("good email")

UPDATE 2017: the code below is 7 years old and was since modified, fixed and expanded. For anyone wishing to do this now, the correct code lives around here: https://github.com/django/django/blob/master/django/core/validators.py#L168-L180

Here is part of django.core.validators you may find interesting :)

class EmailValidator(RegexValidator):    def __call__(self, value):        try:            super(EmailValidator, self).__call__(value)        except ValidationError, e:            # Trivial case failed. Try for possible IDN domain-part            if value and u'@' in value:                parts = value.split(u'@')                domain_part = parts[-1]                try:                    parts[-1] = parts[-1].encode('idna')                except UnicodeError:                    raise e                super(EmailValidator, self).__call__(u'@'.join(parts))            else:                raiseemail_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)  # domainvalidate_email = EmailValidator(email_re, _(u'Enter a valid e-mail address.'), 'invalid')

so if you don't want to use forms and form fields, you can import email_re and use it in your function, or even better - import validate_email and use it, catching possible ValidationError.

def validateEmail( email ):    from django.core.validators import validate_email    from django.core.exceptions import ValidationError    try:        validate_email( email )        return True    except ValidationError:        return False

And here is Mail::RFC822::Address regexp used in PERL, if you really need to be that paranoid.

Ick, no, please, don't try to validate email addresses yourself. It's one of those things people never get right.

Your safest option, since you're already using Django, is to just take advantage of its form validation for email. Per the docs:

>>> from django import forms>>> f = forms.EmailField()>>> f.clean('foo@example.com')u'foo@example.com'>>> f.clean(u'foo@example.com')u'foo@example.com'>>> f.clean('invalid e-mail address')...ValidationError: [u'Enter a valid e-mail address.']