regex

Documentation

Overview

Package regex provides a regex based lexer using a readable list of named patterns.

eg.

Ident = [[:ascii:]][\w\d]*
Whitespace = \s+

Index

• func New(grammar string) (lexer.Definition, error)

Functions

func New

func New(grammar string) (lexer.Definition, error)

New creates a regex lexer from a readable list of named patterns.

This accepts a grammar where each line is a named regular expression in the form:

# <comment>
<name>  = <regexp>

eg.

Ident = [[:ascii:]][\w\d]*
Whitespace = \s+

Order is relevant. Comments may only occur at the beginning of a line. The regular expression will have surrounding whitespace trimmed before being parsed. Lower-case rules are ignored.