PEG

Rosie Pattern Language (RPL) and the Rosie Pattern Engine, including librosie, CLI, REPL, and standard pattern library.

PEGN is a universal notation for expressing any grammar in a way that is easy to parse cognitively and programmatically without any specific implementation in mind.

PEGN Parser Interface and AST Reference Implementation in Go (golang)

Implements types from CPEG: A Typed Tree Construction from Parsing Expression Grammars with Regex-Like Captures in Dhall