Esrap is a PEG parser. PEG is Lex and Yacc combined. I'm sure that you could use esrap as a lexer-only, if you wish to.

http://nikodemus.github.io/esrap/

On my github there's an experimental PEG syntax overlaid over esrap syntax, if you care. https://github.com/guitarvydas

Ping me if you need ref's to papers about PEG.

pt


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