python to javascript regex -

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can me fix regex use in javascript?

(?<!\\\\)#\\{{1,2}

regex tester said:

syntaxerror: invalid regular expression: /(?:((?<!\\)#\{{1,2})|(.))/: invalid group

thanks.

maybe /(?:((?!\\)#\{{1,2})|(.))/. in python negative lookback (?<!...) in javascript (?!...) remove <


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