This wiki page contains some links to valuable resources in the field of Parser Expression Grammar (PEG), which have been useful in the process of extending pigeon.

• Pigeon Syntax Highlighting for Vim
• GopherCon 2019 Lightning Talk: Tim Raymond - Parsing Expression Grammar

• The Packrat Parsing and Parsing Expression Grammars Page, by Bryan Ford
• Parsing Expression Grammars: A Recognition-Based Syntactic Foundation, by Bryan Ford PDF
• Packrat Parsing: Simple, Powerful, Lazy, Linear Time, by Bryan Ford PDF
• Wikipedia article on Parsing Expression Grammar
• A Text Pattern-Matching Tool based on Parsing Expression Grammars
• Parsing Expression Grammars Made Practical, PDF
• Error Reporting in Parsing Expression Grammars PDF latest version
• Error Handling in PEG Parsers
• Improving the Quality of Error Messages in PEG-based Parsers

The following links may help to find some other user provided PEG grammars for pigeon on github.com:

• go:generate with pigeon and peg
• Makefile with pigeon and peg

• Pegasus, Significant Whitespace Parsing, Syntax Extensions

• Pegged, Extended PEG Syntax, Left Recursion, Optimization

• peg

• parboiled, Performance Tuning, Error Handling, Indentation Based Grammars

• pegjs, source

• LPeg
• lpeglabel (LPeg with extensions for failure handling)