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marsha grasett
marsha grasett
9,995 Points

Patterns for Email Validation. yay or nay?

I have used one in a form but now am reading: http://html5pattern.com/ which states:

Please do not use a pattern for email validation. Every regular expression for email validation is missing something. Lots of people gone through a process with the conclusion, that it is nearly impossible to get a perfect validation. The good part about is, we can leave this to our browser developers. They got it quite right and we should use their standard for email validation now.

<input type="email" name="" value="" required />

1 Answer

James Barnett
James Barnett
39,199 Points

As with all HTML5 features, support for type=email varies from browser to browser. So I'm not sure that relying on browser devs is the best idea.

Always remember the first rule of form validation, validate server-side in addition to client-side. So you are still going to need a regex for your PHP (or whatever you are using server side.)

Next question, what is your goal of validating an email address client side. Are you just creating a basic sanity check. For that I'd suggest: pattern="[^@]+@[^@]+\.[a-zA-Z]{2,6}"

If your goal is to make sure your the email addresses you collect are actually valid, maybe because you send out a large-scale mailing list and are charged per email address you can go for a more heavy handed solution.

There's mailcheck.js or verimail.js they will both check for common typos in email addresses.

If you want to match every possible valid email address (on principle* then try:


source: http://www.mi-ange.net/blog/msg.php?id=79&lng=en