Regular Expression to Validate Email Address.

Below Regular Expression will accept Email Address in Upper Case too.

<script type = "text/javascript" language = "javascript">
function validate_email(obj)
{
 var reg = /^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;

 if (reg.test(obj))
 {
    return true; 
 }
 else
 {
    return false;
 }
} 
</script>