url = “http://www.daniweb.com?parm1=value&parm2=value&parm3=value&parm4=value
 
// can i combine these some how?
var parm3RegExp = /parm3=/;
var parm4RegExp = /parm4=/;
 
// finds parm3. Now how can i replace the value?
url = parm3RegExp.exec(url)

var url = url.replace(/parm3=/, "");

url = “http://www.daniweb.com?parm1=value&parm2=value&parm3=value&parm4=value
var urlParm3loc = url.search(/&parm3=/);
var urlParm4loc = url.search(/&parm4=/);
 
if(urlParm3loc  > 0 || urlParm4loc > 0)
  {
	var startIndex = urlParm3loc > urlParm4loc  ? urlParm4loc  : urlParm3loc ;
	url = url.replace(url.substring(startIndex,url.length),"");
  }