Javascript Email Validation

Thursday

Simple email validation in javascript:
This is a script for validate form box to ensure that the user entered a valid email address. If not, the form submition is canceled, and the user prompted to re-enter a valid email address.

This script validate the following assumptions:

The mailID should contains a least one character procedding the "@"
The mailID should contains a "@" following the procedding character(s)
The mailID should contains at least one character following the "@", followed by a dot (.), followed by either a two character or three character string .

Javascript code for validate email address:

<html>
<head>
    <title>Email Validation</title>
    <script type="text/javascript">
var error;
function isValidEmail(){
var str=document.mailValidation.txtEmail.value
var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
if (filter.test(str)){
alert(str +" is  a valid email address");
error=false;
}
else{
alert("Please enter a valid email address!");
error=false;
}

return (error)
}
    </script>

</head>

<body>

    <form name="mailValidation">
    Enter Your Email Address:<br />
    <input type="text" size="15" name="txtEmail">
    <input type="submit" value="Submit" onclick="return isValidEmail();">
    </form>