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HTML 5 added some new input types, including email (<input type="email" name="email" />). However, you may not wish to use the browser’s native validation and implement your own with JavaScript. There are so many different ways to validate an email with JavaScript so choosing a way to do it can be difficult. I personally like using the HTML 5 input approach but want to use my own validation.

Fortunately, we just just look at the specification for the HTML 5 email input and use that regex.

This code allows emails such as user@localhost and is not Unicode — which may not be suitable for your application
function validateEmail(email)  {

    // regex taken from
    var re = /^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;
    return re.test(email);


Tim Bennett is a Leeds-based web designer from Yorkshire. He has a First Class Honours degree in Computing from Leeds Metropolitan University and currently runs his own one-man web design company, Texelate.