Javascript Regex - What to use to validate a phone number?

Question

Could anyone tell me what RegEx would work to validate an international phone number including white space between the numbers and also allowing for these chars: - ( )

Answer 1

function checkPhoneNumber(val) {
    var num = document.getElementById(val).value;
    var mob=/^[+]*[(]{0,1}[0-9]{1,3}[)]{0,1}[-\s\./0-9]*$/g;
    if (mob.test(num) == false) {
        alert("Please Enter Valid Phone Number.");
        document.getElementById(val).value = "";
        return false;
    }
     if (num.length > 15) {
        alert("Only 15 characters allowed for Phone Number field.");
        document.getElementById(val).value = "";
        return false;
    }

    return true;
}

Try it Ones