If not, the form submition is canceled, and the surfer prompted to re-enter a valid address.The script makes the following assumptions regarding what a valid email address is: -Contains a least one character procedding the "@" -Contains a "@" following the procedding character(s) -Contains at least one character following the "@", followed by a dot (.), followed by either a two character or three character string (a two character country code or the standard three character US code, such as com, edu etc) Note that this script requires NS 4 or IE 4 to function- all other browsers will simply not participate in the form validation process.
On the final line we call test method for our regular expression and pass the email address as input.An email address must contain at least a ‘@’ sign and a dot (.).Also, the ‘@’ must not be the first character of the email address, and the last dot must at least be one character after the ‘@’ sign. If the input email address satisfies our regular expression, ‘test’ will return true otherwise it will return false. You can call this method whenever you want to validate email address.a regex alone on clientside, does not know if there is a mailserver nor if the domain itself exists.You can add in more form elements into the form, as you would with any other form.