GoodChat is a Chrome Extension that automatically reduces spammy and repetitive messages in Youtube Chat, replacing it with a much more clear summary window instead!
In addition to its core function, GoodChat has a number of customization options, including the ability to use manual filters(including regex ones) in addition to automatic ones and a plethora of options to make the experience work for you.
https://chrome.google.com/webstore/detail/goodchat-automatic-youtub/kflngokcpddfmpohhlefkbkniakbhadn
Edgemint 