JS Regular expression

Please run the following code in Firefox with Firebug

The code is as follows

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function Myreplace () {  var reg =/%[1-4]/g;  var data = "and"%1 want to know whose%s you%3;   ;  while (1==1)  {   var val = reg.exec (data);   if (val = = null)  & nbsp {    break;   }else{    console.log (val);   }       reg =/cj[0-9]{2}/g;  data = ' cj9080,cj8976,cj12919,cj8765 ';  while (1==1)  {   var val = reg.exec (data);   if (val = = null)  & nbsp {    break;   }else{    console.log (val);     }   } Myreplace ();

Actually the S.replace (Regex,function () {}) usage of the string class is the regex exec () method, except when the regular form is in [1-4]. The Replace method takes 1-4 of the value out of the string as it traverses it, and puts it into the argument[1 of the function.