js正则限制字符串长度

str.split(/reg/);

var test= “How,are,you,doing,today?”

test.split(/[,_]/)

var arr = new Array(3);

arr[0] = "George";

arr[1] = "John";

arr[2] = "Thomas";

arr.join();//"George,John,Thomas"

arr.join(".");//"George.John.Thomas"

var str = "iid0000ffr";

var substr = str.match(/id(\S*)ff/);

console.log(substr)

["id0000ff", "0000"]