all returns all default matchers.

select_with_extension metasyntax external file_extension is a convenience function that returns a matcher associated with a file_extension. E.g., use ".c" to get the C matcher. For a full list of extensions associated with matchers, run comby -list. If metasyntax is specified, the matcher will use a custom metasyntax definition instead of the default. An experimental external callback is a general callback for handling external properties in the rewrite template.

create metasyntax external syntax creates a matcher for a language defined by syntax. If metasyntax is specified, the matcher will use a custom metasyntax definition instead of the default. An experimental external callback is a general callback for handling external properties in the rewrite template.