How are chat filters for forbidden words made?

Question

Chats

There is a general chat in the game. And there are a lot of forbidden words (mat, etc.) how to make a filter for such words with a minimum load and delays?
Forbidden words can be stored in a file or database.
The server has a beanstalkd task queue installed, it can handle it somehow.

Answer 1

For now I use this https://github.com/vearutop/php-obscene-censor-rus

Answer 2

I made a regex based on roots like piz|her|mood, etc.