Email Validation using Php and Javascript

This function checks whether the email provided is valid and returns false if not valid.

Php Function for validating email

//$email -> email value to be validated.

function callEmailCheck($email, $strict = false)
{
$regex = $strict? '/^([.0-9a-z_-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,4})$/i' : '/^([*+!.&#$¦\'\\%\/0-9a-z^_`{}=?~:-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,4})$/i' ;
if (preg_match($regex, trim($email), $matches))    {
return array($matches[1], $matches[2]);
}
else {
return false;
}
}

This function checks whether the user email entered in the text box is valid or not. Call this function on submit.

Javascript Function for validating email

function callEmailCheck() {
var emailreg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
//useremail is the name of the email text field.
var email = document.getElementById("useremail").value;
if(emailreg.test(email) == true){
return email;
}
return "";
}