Validate email with a regex in jQuery

You probably want to use a regex like the one described here to check the format. When the form's submitted, run the following test on each field:

var userinput = $(this).val();
var pattern = /^\b[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b$/i

if(!pattern.test(userinput))
{
  alert('not a valid e-mail address');
}​

This regex can help you to check your email-address according to all the criteria which gmail.com used.

var re = /^\w+([-+.'][^\s]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;

var emailFormat = re.test($("#email").val()); // This return result in Boolean type

if (emailFormat) {}