Trim the String in JavaScript using Regular Expression

<!DOCTYPE html>
<html>

    <body>
        <button onclick="myFunction()">Trim the string</button>
        <script>
        function myTrim(strObj)
        {
            return strObj.replace(/^\s+|\s+$/gm, '');
        }

        function myFunction()
        {
            var tempStr = myTrim(" Welcome to RK JS Code! ");
            alert(tempStr);
        }
        </script>
    </body>

</html>