在django / python中检查电子邮件的有效性

Question

我编写了一个向新闻稿库添加电子邮件的功能。直到我添加了已发送电子邮件的有效性检查，它都可以正常工作。现在，每次我得到“错误的电子邮件”作为回报。有人可以在这里看到任何错误吗？使用的正则表达式为：

\b[\w\.-]+@[\w\.-]+\.\w{2,4}\b并且它是100％有效的（http://gskinner.com/RegExr/），但是我可能使用它是错误的，或者它可能是一些逻辑错误：

def newsletter_add(request):
    if request.method == "POST":   
        try:
            e = NewsletterEmails.objects.get(email = request.POST['email'])
            message = _(u"Email is already added.")
            type = "error"
        except NewsletterEmails.DoesNotExist:
            if validateEmail(request.POST['email']):
                try:
                    e = NewsletterEmails(email = request.POST['email'])
                except DoesNotExist:
                    pass
                message = _(u"Email added.")
                type = "success"
                e.save()
            else:
                message = _(u"Wrong email")
                type = "error"

import re

def validateEmail(email):
    if len(email) > 6:
        if re.match('\b[\w\.-]+@[\w\.-]+\.\w{2,4}\b', email) != None:
            return 1
    return 0

Answer 1

这是django.core.validators的一部分，你可能会觉得很有趣:)

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')

因此，如果你不想使用表单和表单字段，则可以email_re在函数中导入validate_email和使用它，甚至更好地导入和使用它，以获取可能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