// include the latest version of the regex crate in your Cargo.toml
extern crate regex;
use regex::Regex;
fn main() {
let regex = Regex::new(r"(?m)^(((\.\d+)|(0+((e|E)\d+)?)|(0+\.\d*((e|E)-\d+)?)|((1|1\.0*)((e|E)-\d+)?)|(1\.\d+((e|E)-[1-9]\d*)))(\s+|,\s*)){3}((\.\d+)|(0+((e|E)\d+)?)|(0+\.\d*((e|E)-\d+)?)|((1|1\.0*)((e|E)-\d+)?)|(1\.\d+((e|E)-[1-9]\d*)))$(
# just a way to comment
# The ^$ anchors are there because xml always assumes them.
# They are required here for proper testing.
)*").unwrap();
let string = "1 1 1 1";
// result will be a tuple containing the start and end indices for the first match in the string
let result = regex.captures(string);
let (start, end) = match result {
Some((s, e)) => (s, e),
None => {
// ...
}
};
println!("{}", &string[start, end]);
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Rust, please visit: https://docs.rs/regex/latest/regex/