This NIP is not yet in main. Here is an overview of PRs referencing this NIP.
NIP-50 search filter should work with multiple values  OPEN @viktorvsk
Add a note regarding matching events in real-time using custom NIP-50 filters OPEN @viktorvsk
Implement Markdownlint GitHub action OPEN @mariano-perez-rodriguez
Markdown improvements, embelishments, and standardizations CLOSED @mariano-perez-rodriguez
Update all NIPs to include 'depends' and 'mentions' tags OPEN @blakejakopovic
Fix NIP-50 typo MERGED @lpicanco
Rewrite NIP-50, 'keywords' changed to 'search` MERGED @brugeman
NIP-50: Keywords Filter MERGED @brugeman