This grammar parses various styles of Backus-Naur Form (BNF). BNF is distinguished from Extend BNF (EBNF) with the addition of Kleene operators.

Ken Domino

BNF

https://dl.acm.org/doi/pdf/10.1145/366193.366201

https://www.softwarepreservation.org/projects/ALGOL/paper/Backus-Syntax_and_Semantics_of_Proposed_IAL.pdf

https://dl.acm.org/doi/pdf/10.1145/355588.365140

• Grammar is ambiguous.