Something like this ?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="generator" content="PSPad editor, www.pspad.com">
<title></title>
<style type="text/css">
body{margin:0;padding:0;font-family;georgia0}
#pge{display:block;width:600px;margin:30px auto;}
</style>
<script type="text/javascript">
window.onload=function(){
var txt=document.body.innerHTML.replace(/<\/?[^>]+>/g,'');// the text without tags
txt.replace(/=([^']{10,10})'/g,function(a,b){alert(b); /*do something with b */ });
}
</script>
</head>
<body>
<div id="pge"><fieldset><legend>Find string</legend>
<p>Lorem ipsum dolor sit amet consectetuer aliquet tincidunt molestie dui non. </p>
<p>Nibh hendrerit tristique sit mi et odio=search me!'chose' boy augue lobortis ut elit. </p>
<p>Justo condimentum dui non consectetuer nisl ac elit feugiat Aenean ipsum. </p>
<p>Nibh nibh pede et magna=find this!'truc' Vestibulum Vestibulum est laoreet non eleifend. Neque dolor urna.</p>
<p>Nibh pharetra lobortis ac Nunc dui augue urna sapien Vestibulum In.</p>
<p>Lacus Fusce pharetra Nunc iaculis laoreet lacinia id tellus Aenean eget.</p>
<p>Sed *** Curabitur interdum vestibulum et tortor amet Nulla id ipsum.</p>
</fieldset></div>
</body>
</html>
To adapt with the nature of the body content...