Worldwide email validation

So iv been doing a lot of reading on the best way to validate an email address before submitting a form. Iv read in multiple areas that regular expressions shouldn't be used to validate email addresses. eg

http://www.regular-expressions.info/email.html

Validate email address in JavaScript?

my problem with using regular expressions is that I need to be able to allow foreign characters in emails as they could be coming from anywhere in the world and I dont know how to ensure they are allowed without spending an age setting up useless accounts to test.

Further into my reading I saw someone state that validation should be done server side (as well).

All I get in search results for server-side validation are links to regular expressions.

Iv'e also looked at simple validation using indexOf and lastIndexOf on certain characters but I don't see how that will allow all the possible domains without some crazy complex code.

So essentially my question is what are the options for sever-side validation other than again using regular expressions (if there are any other options)?

Appreciate any help!

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In PHP you can use filter_var . Example from the docs:

$email = filter_var('bob@example.com', FILTER_VALIDATE_EMAIL);

In this case, $email will contain "bob@example.com". For an invalid email address, it will contain false .

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Short answer: You can't do it. You can write regular expressions that will tell you whether an email address looks valid, but, as you say, there are enough exceptions to render that approach questionable.

The only way you can truly know that an email address is valid (and was used by the owner for whatever you are doing) is to send a clickable link containing a unique token to that address and see whether it gets clicked.

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服务器端验证使用PHP源代码：http://www.w3schools.com/php/filter_validate_email.asp

<?php
$email = "someone@example.com";

if(!filter_var($email, FILTER_VALIDATE_EMAIL))
  {
  echo "E-mail is not valid";
  }
else
  {
  echo "E-mail is valid";
  }
?>

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