regex 0.1.58

An implementation of regular expressions for Rust. This implementation uses finite automata and guarantees linear time matching on all inputs.
Documentation 
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// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![cfg_attr(feature = "pattern", feature(pattern))]

extern crate rand;
extern crate regex;

// Due to macro scoping rules, this definition only applies for the modules
// defined below. Effectively, it allows us to use the same tests for both
// native and dynamic regexes.
//
// This is also used to test the various matching engines. This one exercises
// the normal code path which automatically chooses the engine based on the
// regex and the input. Other dynamic tests explicitly set the engine to use.
macro_rules! regex_new {
    ($re:expr) => {{
        use regex::Regex;
        Regex::new($re)
    }}
}

macro_rules! regex_set_new {
    ($re:expr) => {{
        use regex::RegexSet;
        RegexSet::new($re)
    }}
}

macro_rules! regex {
    ($re:expr) => {
        regex_new!($re).unwrap()
    }
}

macro_rules! regex_set {
    ($res:expr) => {
        regex_set_new!($res).unwrap()
    }
}

#[cfg(feature = "pattern")]
macro_rules! searcher_expr { ($e:expr) => ($e) }
#[cfg(not(feature = "pattern"))]
macro_rules! searcher_expr { ($e:expr) => ({}) }

// Must come before other module definitions.
include!("macros_str.rs");
include!("macros.rs");

mod api;
mod api_str;
mod crazy;
mod flags;
mod fowler;
mod multiline;
mod noparse;
mod regression;
mod replace;
mod searcher;
mod set;
mod unicode;

#[test]
fn set_empty() {
    use regex::{Error, RegexSet};
    let err = RegexSet::new::<&[String], &String>(&[]).unwrap_err();
    match err {
        Error::InvalidSet => {}
        err => panic!("expected Error::InvalidSet but got {:?}", err),
    }
}

#[test]
fn set_one() {
    use regex::{Error, RegexSet};
    let err = RegexSet::new(&["foo"]).unwrap_err();
    match err {
        Error::InvalidSet => {}
        err => panic!("expected Error::InvalidSet but got {:?}", err),
    }
}

#[test]
fn disallow_unicode_flag() {
    assert!(regex::Regex::new("(?-u)a").is_err());
}