How to replace non alphanumeric characters using javascript

<script language="JavaScript">
var temp = new String('This is a te!!!!st st>ring... So??? What...');
document.write('<b>Original String:-</b>'+temp + '<br />');
temp =  temp.replace(/[^a-zA-Z 0-9 ]+/g,'');
document.write('<b>Replaced String:- </b>'+temp + '<br />');