Doru's suggestion of PP + islands is good and makes building complex parsers 
easy, but his toy example gives wrong results:

<script>
function end() {
        document.writeln('</script>');
}
function start() {
        document.writeln('<script>');
}
</script>

or:
<script>
alert('hello');
// <script> alert('world')
</script>

or:
<!--<script>alert('hello')</script>-->

better to use one of the proper HTML parsers, at least if you need more 
correctness.

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