Sorry, but I don't completely understand what you're doing there.
But this is what I'd try (example html)
<html>
<body>
<ol>
<script>
// define the test text
var mytext="this is 'MyText', an awful piece of $%&%$ยง is mytext, that's
what it is.";
// show it as "1"
document.writeln("<li>", mytext, "</li>");
// change to lower case
var mylower= mytext.toLowerCase();
// show it as "2"
document.writeln("<li>", mylower, "</li>");
// get all "words"
var myarray= mylower.match(/(\w+)/g);
// show them as "3"
document.writeln("<li>",myarray,"</li>");
// count word occurence
var mylist= new Object;
for (i in myarray) {
++mylist[myarray[i]];
}
// show just the words as "4"
document.writeln("<li>",Object.keys(mylist),"</li>");
</script>
</ol>
</body>
</html>
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