How-to guides

Task-oriented recipes. Each one assumes you already know the basics (if not, start with the Parse your first header) and shows how to accomplish a specific goal.

• Validate input against a grammar — check that a string conforms to a grammar.

• Extract values from a parse tree — pull data out of a parse tree.

• Load a grammar from a file — parse with a grammar kept in a .abnf file.

• Write your own grammar module — define a grammar, including importing rules from another.

• Use the Rust backend — install, force, and build the optional Rust backend.