get URL param value #javascript

get_URL_param_value.js

/**
 * gets value of a URL param if exists
 * @param {string} name the param you want the value of
 * @return {string} result value of param if exists or ""
 */
function getURLparam(name) {
    var regex,
        results;
    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
    regex = new RegExp("[\\?&]" + name + "=([^&#]*)");
    results = regex.exec(location.search);
    return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}