You may want to cross-post this to !lemmy@lemmy.ml instead, as that’s where Lemmy-as-software discussions/requests are more appropriate. It’d be a nice feature for sure though, and the current “Hide read posts” option is just a bit too overkill to suggest as a workaround for you for now, I think.

also useful to hide post that contain a string in the title.

Seconded, would be nice to also have “hide all posts with this url” to cover posts to other communities/servers, but that’s less critical.

This feature is available in some clients

You should give Voyager a try https://vger.app

You can slide posts to hide them, that’s how my feed stays fresh.

Not quite the same thing but just today I’ve come across this userscript: lemmy-keyword-filter

It’s a very simple keyword filter. I am using it to get rid of some noise from a community that I am otherwise interested in.

I use Violentmonkey to run it but any userscript engine should do as long as it supports GM_getValue, GM_setValue and GM_registerMenuCommand which are used to provide a minimal UI to edit the keyword list. You might want to edit the @match rule to restrict it to the Lemmy instances you use.

It’s title and body better for you than title + body? I added it to my app after multiple people asked for it, but I don’t understand the appeal

My favorite part about boost was the ability to blacklist key words and hide posts. Blacklisting the word anime and hiding every bait and switch meme was great