<!DOCTYPE html>
<html lang="en">
<head>
<title>JavaScript E-Mail Validation</title>
</head>
<body>
<script type="text/javascript">
function validate(form_id, email) {
var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
var address = document.forms[form_id].elements[email].value;
if(reg.test(address) == false) {
alert('Invalid Email Address');
return false;
}
}
</script>
<form id="form_id" method="post" action="form_submit_message.php" onsubmit="javascript:return validate('form_id', 'email');">
Enter Your Email Address:
<input type="text" id="email" name="email" size="35"/>
<input type="submit" value="Submit"/>
</form>
</body>
</html>
