3、选择和分组

//选择    |   
//分组   ( )
 var str = "哪里，哪去能发多少积分"
 var reg = /哪里|能发/g
 console.log(str.replace(reg,"*"));

var url = "http://www.baidu.com"
var https = "https://www.baidu.com"
var reg  =/(http|https):\/\/www\.baidu\.com/;
console.log(reg.test(url))
console.log(reg.test(https))