// 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"(?iU)(?:([\s\d\x2e]*[^\s\d\x2e\x3a]+[\x2e\s\d]*)|(?:[^\s\d\x2e\x3a]+[\s\d\x2e]*)[^\s\d\x2e\x3a]+)[\r\n]").unwrap();
let string = " 512345.0a222aas22asas22asd2asdfasdf2asdfasdfasd222222aaaaafdasdfasdf222asdfasdf32asdfasdf
Content-Length: 0aasd2as
";
// 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/