JS使用正则表达式找出最长连续子串长度

function maxLenStr(str){
 var len = 0, max_len = 0;
 var reg = new RegExp("(.)\\1{1,}","g");
 var res = reg.exec(str);
 while(res != null){
 len = res[0].length;
 if(max_len < len){
 max_len = len;
 }
 res = reg.exec(str)
 }
 return max_len;
}

var str = '#param1#abcdef#param2#hjklllj#param3#7878'
var count = str.match(/param\d*/g)
console.log(count) ／／ ["param1", "param2", "param3"]