如何用“正则表达式”实现这样的功能

<textarea id=demo>
import java.awt.*;
import java.awt.*;public class MyClass
{
   /*my comment
      fdsfdsfdsk
    */
   public MyClass()
   {
       int i=0;     
       System.out.println("ok!");//my comment
       System.out.println(i);
   }
}
</textarea><input type=button value=show onclick=show(demo,result)>
<div id=result></div>
<script>
function show(f,t){
var tmp=f.value.replace(/</g,"&lt;").replace(/ /g,"&nbsp;")
tmp=tmp.replace(/(java\.awt)/g,"<b>$1</b>")
tmp=tmp.replace(/(System\.out)/g,"<b>$1</b>")
tmp=tmp.replace(/(\/\*(.|\n)*?\*\/)/g,"<font color=blue>$1</font>")
tmp=tmp.replace(/(\/\/.*?\n)/g,"<font color=blue>$1</font>")
tmp=tmp.replace(/\n/g,"<br>")
t.innerHTML=tmp;
}
</script>