js网址正则匹配

let url = 'http://wwww.baidu.com?a=1#haha';
let reg = /^(?:(http|https|ftp):\/\/)?((?:[\w-]+\.)+[a-z0-9]+)((?:\/[^/?#]*)+)?(\?[^#]+)?(#.+)?$/i;
console.log(reg.exec(url));