Codex (https://codex-kappa-dusky.vercel.app/) is an attempt to rethink what find & replace should look like in a modern code editor. It defines a simple but powerful syntax for describing code modifications, combining plain text, regular expressions and Tree-sitter queries, along with sensible handling of newlines and indentation*.
It can be used just like regular plain text find & replace, but allows freely mixing in regexes and Tree-sitter queries as more flexibility is needed.
It introduces "line quantifiers" for matching a bunch of lines at the same nesting level, so basic structural changes can be achieved without even using a query (see the JavaScript function example in the link).
I designed Codex with a specific use case in mind (the one I show in my demo video: https://www.youtube.com/watch?v=MQ_N0-AJ2Qg), so any suggestions for other things it should support would be much appreciated, as well as general feedback.
*Indentation is relative and space/tab agnostic.