You mean directly on the relay side, right? I was thinking about building a simple rest api for my relay just for the search. I guess centralized search is slightly better than no search at all in my case.
Discussion
I was joking about filters: { sql } nostr subscriptions.
If you run your own relay, you could make it support filters: { searchTerm } and do a nip for it. Rest api may be easier though.
Went right over my head :D I spent last 2 days hacking the events “pagination” thingy so not much energy left for social interactions lol.