紧急求救：请教编写一个子字符串在主字符串中出现次数的程序？

Question

<SCRIPT LANGUAGE="JavaScript">
<!--
var cnt=0;
var s="01,02,03,04,05,02,04";
var c=s;
while(/02/.test(c)) {
cnt++; c=c.replace(/02/,"--");
}
alert("出现次数:\n" +cnt)
//-->
</SCRIPT>

Answer 1

<SCRIPT>
function reg_count(str,reg){
   var r, re;                   
   re = new RegExp(reg,"ig");  
   r = str.match(re);         
   return r.length;}
var string1="02,03,02,22,23,02,025";alert(reg_count(","+string1+",",",02,"));
</SCRIPT>