Didn't know jimbocoin was into nips 🫡
Yeah, tag filters specifically are single letters, provided the relay supports NIP-12. https://github.com/nostr-protocol/nips/blob/master/12.md
NIP-50 allows a more general ‘search’ filter property for general text searches. https://github.com/nostr-protocol/nips/blob/master/50.md
Discussion
I’m implementing a relay. In the middle of a deep refactor to make it Express compatible and support a middleware-like API to make it easier to implement customizations and NIPs.
Description: https://github.com/jimbojw/memorelay/issues/49
Work in progress: https://github.com/jimbojw/memorelay/compare/main...49-middleware