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email validation in python

Last Modified: 2012-05-11
hey, i have a little function in python to validate email. however aa@aa......com get pass. and aa@aa,com get pass too. how do we fix it.

def validateEmail(email_str):
        if (len(email_str)) > 6:
                if re.match("^[a-zA-Z0-9._%-]+@[a-zA-Z-9._%-]+.[a-zA-Z]{2,6}$",email_str) != None:
                        return 1
        return 0

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