Regular expression support for tust is provided by the regex
crate, add it to your Cargo.toml
:
[dependencies]
regex = "0.1"
The main interface of the regex
crate is regex::Regex
:
extern crate regex;
use regex::Regex;
fn main() {
//"r" stands for "raw" strings, you probably
// need them because rustc checks escape sequences,
// although you can always use "\\" withour "r"
let num_regex = Regex::new(r"\d+").unwrap();
// is_match checks if string matches the pattern
assert!(num_regex.is_match("some string with number 1"));
let example_string = "some 123 numbers";
// Regex::find searches for pattern and returns Option<(usize,usize)>,
// which is either indexes of first and last bytes of match
// or "None" if nothing matched
match num_regex.find(example_string) {
// Get the match slice from string, prints "123"
Some(x) => println!("{}", &example_string[x.0 .. x.1]),
None => unreachable!()
}
}