gistfile1.txt

    function isValidUSPhoneNum(number) {
        // Matches valid US numbers of the form
        // xxx (whitespace or -) xxx (whitespace or -) xxxx
        var USPhoneNumRegex = /^(?:\([2-9][0-9]{2}\)(?:[\s]*|[-])|[2-9][0-9]{2}(?:[\s]*|[-]))[0-9]{3}(?:[\s]*|[-])[0-9]{4}$/;

        // booleanize bitch
        return !!number.match(USPhoneNumRegex);
    }