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Fast lexer code generator for Rust
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docs First commit Apr 8, 2019
src Move process function to Apr 10, 2019
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rflex is a fast lexical analyzer generator for Rust.

GitHub license Crates Status

cargo install rflex


Write your Cargo.toml and

# ...
build = ""

# ...
rflex = "0.2"
extern crate rflex;
use std::path::Path;

fn main() {
    let path = Path::new("src").join("target.l");
    let path = path.to_str().unwrap().to_string();
    if let Err(e) = rflex::process(path) {
        eprintln!("{}", e);


Unsupported regular-expression

  • e{num} ... repeat e num times
  • e{min,max} ... repeat e min to max times
  • e/s ... lookahead s before accept e


  • rflex is released under MIT License.


  • Copyright (c) 2018 Preferred Networks, Inc.
  • Partial original codes were written in Java under 3-clause BSD license:
    • Copyright (c) Gerwin Klein, Steve Rowe, Regis Decamp. All rights reserved.

Dependent libraries

These libraries are used only rflex lexer generator, generated code doesn't depend on them.

  • fixedbitset released under MIT License
    • Copyright (c) 2015-2017
  • liquid released under MIT License
    • Copyright (c) 2014 cobalt-org
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