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This is one of regular expression examples on jsB@nk that use RegExp object to find and replace text, but this is simple regular expression code with a few lines.

Label: text, regular, expression, replacer, RegExp, object, find, replace

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<script type="text/javascript">
<!--
// Created by: Corneliu Lucian 'Kor' Rusu :: corneliulucian[at]gmail[dot]com

var words={
// Add words here to be changed. Format - 'original':'replacement'
'Bill':'Linus',
'IE':'Firefox',
'Windows XP':'Ubuntu Linux'
}
var regs=[];
for(arg in words){regs[regs.length]=new RegExp(arg,'g')}

function replaceText(){
var tags=document.getElementsByTagName('body')[0].getElementsByTagName('*');
var i=0,t;
	while(t=tags[i++]){
		if(t.childNodes[0]){
			var j=0, c;
			while(c=t.childNodes[j++]){
				if(c.nodeType==3){
					var k=0;
					for(arg in words){
						c.nodeValue=c.nodeValue.replace(regs[k],words[arg]);
						k++;
					}
				}
			}
		}
	}
}
//-->
</script>

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<ul style="text-align: left;">
  <li>Bill</li>
  <li>IE</li>
  <li>Windows XP</li>
</ul>
<p>
<span onclick="replaceText()"><strong><em>Click here to replace</em></strong></span></p>