Javascript 正则表达式获取分组数据

var url = 'http://localhost:8080/datamarket/tableList?search=%E6%8F%90%E4%BE%9B%E6%95%B0%E6%8D%AE%E8%A1%A8%E5%8F%8A%E5%AD%97%E6%AE%B5%E7%9A%84%E6%9F%A5%E8%AF%A2';
re = /^(.+?)#$/;

var r = re.exec(url) ;
alert(r.constructor)
if(r) {
    alert(r[1]);
}