Regex for email confirmation

Question

I'm using the following code to make sure fields are filled in. How can I add some code to make sure it's a valid email?

function verify() { if ($("#ddlBusinessName").val() == "0") { alert("Please select the name."); } else if ($("#txtEmail").val().length <= 0 || $("#txtEmailConfirm").val().length <= 0) { alert("Please enter the email address and confirm the email address."); else if ($("#TxtPassword").val().length <=0 || $("#TxtConfirmPassword").val().length <=0) { alert("Please enter your password."); } }

EDIT How can I implement this into my code though?

 function validateEmail(email) { var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\ ".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA -Z\-0-9]+\.)+[a-zA-Z]{2,}))$/; return re.test(email); }

you are never going to fully validate an email address with regular expressions. find a library that will validate it for you. — lincolnk
– lincolnk, Commented Jan 27, 2012 at 20:24
Have you searched a bit on Stackoverflow? stackoverflow.com/… — Don Roby
– Don Roby, Commented Jan 27, 2012 at 20:25
Here's an example of a quite complete regex for email btw: ex-parrot.com/~pdw/Mail-RFC822-Address.html — talnicolas
– talnicolas, Commented Jan 27, 2012 at 20:45

Community · Accepted Answer · 2017-05-23 11:48:46Z

The only safe way to validate an email address is actually sending an email to it. If this fails with a (permanent - graylisting errors would be temporary) error code you know the address is invalid.

Of course you cannot do that in JavaScript - so I'd limit the client-side check to a very simple check - something like /^[^@ ]+@[^@ ]+\.[^@ ]+$/ (thx @NedBatchelder) would do the job.

Community · Accepted Answer · 2017-05-23 11:43:12Z

I just answered a similar question. https://stackoverflow.com/a/12674524/340736

For your client-side validation I would recommend that you use Verimail.js. It validates your e-mail address against a RFC 822 regular expression, but also a full list of all registered TLD's.

Tim · Accepted Answer · 2012-01-27 20:22:53Z

Try RegExpLib Site Reference

Note that you're validating the email could exist, not that it does exist!

Ned Batchelder · Accepted Answer · 2012-01-27 20:25:02Z

0

Don't try to get too fancy with email address validation. Try this: Humane email validation.

answered Jan 27, 2012 at 20:25

Ned Batchelder

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