blocks|key|988945|text|尼克，不，请不要试图自己验证电子邮件地址。这是人们永远不会做对的事情之一。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|988946|既然你已经在使用Django，那么最安全的选择就是利用它的电子邮件表单验证功能。根据docs|offset|length|988947|>>>+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.']|code-block|syntax|javascript|988948|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.djangoproject.com/en/3.0/ref/forms/fields/#django.forms.Field.clean^0|0|16|4|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

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 <a href="https://docs.djangoproject.com/en/3.0/ref/forms/fields/#django.forms.Field.clean" rel="nofollow noreferrer">docs</a>:
<pre><code>&gt;&gt;&gt; from django import forms
&gt;&gt;&gt; f = forms.EmailField()
&gt;&gt;&gt; f.clean('foo@example.com')
u'foo@example.com'
&gt;&gt;&gt; f.clean(u'foo@example.com')
u'foo@example.com'
&gt;&gt;&gt; f.clean('invalid e-mail address')
...
ValidationError: [u'Enter a valid e-mail address.']
</code></pre>

blocks|key|1203462|text|你弄错了，但这是一个你无论如何都不能完成的任务。只有一种方法可以知道RFC+2822地址是否有效，那就是向它发送邮件并获得响应。做其他任何事情都不会改善你的数据的信息内容，即使是一小部分。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1203463|您还可以忽略人为因素和接受属性，因为当您将我的地址提供给validateEmail时，|style|CODE|1203464|me%2Bvalid@mydomain.example.net|code-block|syntax|javascript|1203465|你告诉我我搞错了，我就跟你的申请说再见。|1203466|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ietf.org/rfc/rfc2822.txt^0|Y|8|0|0|S|D|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@$A|11|B|12|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|13|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|14|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

You got it wrong, but it is a task that you can't do anyway. There is one and only one way to know if an <a href="http://www.ietf.org/rfc/rfc2822.txt" rel="noreferrer">RFC 2822</a> address is valid, and that is to send mail to it and get a response. Doing anything else doesn't improve the information content of your datum by even a fractional bit.

You also screw the human factor and acceptance property, for when you give <code>validateEmail</code> my address of

<pre><code>me+valid@mydomain.example.net
</code></pre>

and you tell me I've made an error, I tell your application goodbye.

blocks|key|989004|text|from+django.core.exceptions+import+ValidationError
from+django.core.validators+import+validate_email

value+=+"foo.bar@baz.qux"

try:
++++validate_email(value)
except+ValidationError+as+e:
++++print("bad+email,+details:",+e)
else:
++++print("good+email")|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|989005|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>from django.core.exceptions import ValidationError
from django.core.validators import validate_email

value = "foo.bar@baz.qux"

try:
 validate_email(value)
except ValidationError as e:
 print("bad email, details:", e)
else:
 print("good email")
</code></pre>

blocks|key|1203515|text|此正则表达式将以合理的准确性验证电子邮件地址。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1203516|\w[\w\.-]*@\w[\w\.-]%2B\.\w%2B|code-block|syntax|javascript|1203517|它允许字母数字字符、_、.和-。|offset|length|style|CODE|1203518|entityMap^0|0|0|A|1|C|1|E|1|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|N|$]]

This regex will validate an email address with reasonable accuracy.

<pre><code>\w[\w\.-]*@\w[\w\.-]+\.\w+
</code></pre>

It allows alphanumeric characters, <code>_</code>, <code>.</code> and <code>-</code>.

blocks|key|989104|text|我可以在这里看到许多答案都是基于python的django框架的。而是为了验证电子邮件地址为什么要安装如此繁重的软件。我们有Python的Validate_email包，它可以检查电子邮件是否有效，格式是否正确，是否确实存在。这是一个轻量级的包(大小小于1MB)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|989105|安装：|989106|pip+install+validate_email|code-block|syntax|javascript|989107|基本用法：|989108|检查电子邮件的格式是否正确。|989109|from+validate_email+import+validate_email
is_valid+=+validate_email('example@example.com')|989110|要检查域mx并验证电子邮件是否存在，您可以随validate_email一起安装pyDNS包。|989111|验证电子邮件是否存在：|989112|from+validate_email+import+validate_email
is_valid+=+validate_email('example@example.com',verify=True)|989113|如果电子邮件存在于现实世界中，则返回True，否则返回False。|989114|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|13|8|@]|9|@]|A|$G|H]]|$1|O|3|P|5|6|7|14|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|17|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

I can see many answers here are based on django framework of python. But for verifying an email address why to install such an heavy software. We have the Validate_email package for Python that check if an email is valid, properly formatted and really exists. Its a light weight package (size &lt; 1MB).

INSTALLATION : 

<pre><code>pip install validate_email
</code></pre>

Basic usage:

Checks whether email is in proper format.

<pre><code>from validate_email import validate_email
is_valid = validate_email('example@example.com')
</code></pre>

To check the domain mx and verify email exists you can install the pyDNS package along with validate_email.

Verify email exists : 

<pre><code>from validate_email import validate_email
is_valid = validate_email('example@example.com',verify=True)
</code></pre>

Returns True if the email exist in real world else False.

I have written a function for adding emails to newsletter base. Until I've added checking validity of sent email it was working flawlessly. Now each time I'm getting "Wrong email" in return. Can anybody see any errors here ? The regex used is :

<code>\b[\w\.-]+@[\w\.-]+\.\w{2,4}\b</code> and it is 100% valid (<a href="http://gskinner.com/RegExr/" rel="noreferrer">http://gskinner.com/RegExr/</a>), but I may be using it wrong, or it may be some logic error :

<pre><code>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) &gt; 6:
 if re.match('\b[\w\.-]+@[\w\.-]+\.\w{2,4}\b', email) != None:
 return 1
 return 0
</code></pre>

Checking validity of email in django/python

Django

Python

我已经写了一个函数，用于添加电子邮件到时事通讯基础。直到我添加了检查已发送电子邮件的有效性，它才能完美地工作。现在，每次我都会收到“错误的电子邮件”。有人能看到这里有什么错误吗？使用的正则表达式为：\b[\w\.-]+@[\w\.-]+\.\w{2,4}\b，它是100%有效的()，但我可能用错了，或者它可能是一些逻辑...

问在django/python中检查电子邮件的有效性
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