I thought about why it would be difficult, not caring about that I don't know crap about anything, and I came up with something.
either the difficult comes up in one of these steps:
1. searching for each and every thread and comment,
2. identify them individually and differently as a thread and comment,
3. this seems to be the difficult part:
and somehow apply hide to all threads and apply "a not hide"/function disabled/action deleted to threads with the exact words or phrase in the comment field?
so it might be hard to have the filter do something like
hide the white box,
but not hide the white boxes with a black circle in them?
i also read the word comment in my post and...
having this apply to a comment is stupid
the comment wouldn't have the "filter phrase" that allows it to shown.
though the first comment or comment that starts the thread (i need to remember/learn of this word) would be shown, most of the comments would be hidden.
thread and comment should have different filters.
this should only apply to the comment that starts the thread, the first comment that always shows on the list of threads no matter how much replies it gets.
I can see how separating the comment and the first comment that starts the thread be difficult. they have the same sort of data i guess.