getParameterByName from url

gistfile1.txt

function getParameterByName(name, url) {
    name = name.replace(/[\[\]]/g, "\\$&");
    let regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
        results = regex.exec(url);
    if (!results) return '';
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, " "));
}