What are the methods of automatic content control systems?

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There is a group that needs to be modeled by a bot. How to configure the bot to maximize recognition accuracy I
used regular expressions, but craftsmen hang characters in words. If we improve the regular, then more normal comments are caught.
Long texts are generally a problem.
There is an option to use the user's statistics (how many were caught when he signed up ...)
Or enter hashes into the table and then, if you caught a lot, then bug.