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copied!<blockquote> <p><strong>UPDATE 2017</strong>: 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: <a href="https://github.com/django/django/blob/master/django/core/validators.py#L168-L180" rel="noreferrer">https://github.com/django/django/blob/master/django/core/validators.py#L168-L180</a></p> </blockquote> <p>Here is part of django.core.validators you may find interesting :)</p> <pre><code>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: raise 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) # domain validate_email = EmailValidator(email_re, _(u'Enter a valid e-mail address.'), 'invalid') </code></pre> <p>so if you don't want to use forms and form fields, you can import <code>email_re</code> and use it in your function, or even better - import <code>validate_email</code> and use it, catching possible <code>ValidationError</code>.</p> <pre><code>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 </code></pre> <p>And here is <a href="http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html" rel="noreferrer">Mail::RFC822::Address regexp</a> used in PERL, if you really need to be that paranoid.</p>

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