You can delete all java-script tags in the HTML file:

Just use one of these regular expressions:

<script[^>]*>.*</script>
or
<script(.*?)>.*?</script>
or
<script.*?<\/script>
or
<script( [^>]+)?>(.*)</script>
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The best choice is:

<script(.*?)<\/script>


Don't forget to check: (X)regular expression
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For it could work in the multi-line file do the next:

Check "Regular Expressions Can Match New Line Characters" (in the options menu "Customize Tab->Search")

And input 20000 lines (for example) for "Additional Lines to Search for Regular Expressions"