PHP Function to Validate Email

Validate Email in php. Simple php function to validate email address.

function validateEmail($email) {
    if(preg_match("~([a-zA-Z0-9!#$%&'*+-/=?^_`{|}~])@([a-zA-Z0-9-]).([a-zA-Z0-9]{2,4})~",$email)) {
        return true;
    } else {
        return false;
    }
}