ES6 retrieve GET parameters from URL

getURL.js

    /**
     * Retrieve parameter values from URL
     * @param {name} name of paramater
     * @param {url} URL to fetch parameter from | optional
     * @returns URL param value || null
     */
    const getURLParemeters = ( name, url ) => {
        if (!url) url = location.href;
        name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
        var regexS = "[\\?&]"+name+"=([^&#]*)";
        var regex = new RegExp( regexS );
        var results = regex.exec( url );
        return results == null ? null : results[1];
    }