- Parsing Expression Grammars (PEG) are simple to write and use, especially with the cpp-peglib library.
- cpp-peglib is a single-include C++ library that requires no preprocessing or external tools.
- Example: parsing a vector format using PEG grammar and attaching functions to extract numbers.
- Example: handling escaped characters in quoted strings with the choice operator and token manipulation.
- Example: building a full Prometheus metrics parser including labels, comments, and special values (NaN, +Inf, -Inf).
- Regular expressions in PEG do not need to be perfect; validation can be delegated to parsing functions.
- cpp-peglib supports Unicode, AST generation, and provides online tools for grammar development.
- PEG with cpp-peglib enables writing robust and secure parsers with less code compared to hand-crafted or regex-based approaches.