This seems way more error prone than just using an HTML parser and removing script tags.
If you use a syntactical parser, you can guarantee your output is safe, all the time. If you're using non-syntactical techniques, then you have to go and find all these edge cases that you should crash on in the first place.
If you use a syntactical parser, you can guarantee your output is safe, all the time. If you're using non-syntactical techniques, then you have to go and find all these edge cases that you should crash on in the first place.