Simple LS2J Regular Expression class

A simple Regular Expression class. You may need to remove the line-breaks I've inserted to make it fit the width of the blog.

/*
Usage: 
 Uselsx "*javacon"
 Use "whateverYouCallThisLS2J-class"
 --
 Dim js As JAVASESSION
 Dim regexp As JAVACLASS
 
 Set js =  New JAVASESSION
 Set regexp = js.GetClass("RegExp")
 
 Print regexp.test("http://www.compendia.no",
  ".*compendia.*") -> True
 Print regexp.split("test","e") -> "t,st"
 Print regexp.replace("test pest hest", 
  "t\\w"," ", true) -> "tes pes hes"
*/

public class RegExp {
 //test a string
 public static boolean test(String streng, String expr){  
  return streng.matches(expr);
 }
 //returns a comma separated string
 public static String split(String streng, String expr){
  String temp[] = streng.split(expr);
  if(temp.length == 0) return "";
  
  String res = temp[0];
  for(int i=1; i < temp.length; i++){
   if(temp[i].length()==0) continue;
   res += "," + temp[i];
  }
  return res;
 }
 //replace parts of a string
 public static String replace(String streng, 
   String from, String to, boolean all){
  return all ? 
   streng.replaceAll(from, to) :
   streng.replaceFirst(from, to);   
 }
  
}