What is the regular expression for does not contain

I have a number of advanced filters that used regular expressions. I would like to replicate the “does not contain” filter. I think it is something to do with negative lookaheads like (?!..) but have not worke dout how to do that. Also is there something about the e flavour of regex used in libra office being different to that used elsewhere. I have tried
both of these give me 220 results while the “does not contain” gives me 358 results.

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ICU regex engine is used in LibreOffice, with its syntax.

Maybe this could work: regex - Regular expression that doesn't contain certain string - Stack Overflow

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delete duplicate post

fabulous. That worked.

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