String Manipulation - General filter

Good morning everyone, how are you?

First, I'd like to say that I'm very happy with the progress of our community. I have a workflow where I'm filtering based on a column of comments, so imagine the possibilities for the same word, haha, there are many.

So I'd like a node that allows filtering based on a keyword, regardless of whether it's uppercase or lowercase, or if it's accompanied by another word; if it contains the keyword, it should be filtered.

Example: test, TEST, Test and, Test avanc, Testbus, etc....

Note: I've already tried using Rule-Based Filter using keyword but it didn't work.