// 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+([eE]-\d+)?)|((0+(\.0*)?|\.0+)([eE]\+?\d+)?)|(0+\.\d*([eE]-\d+)?)|((1|1\.0*)([eE]-\d+)?)|(\d(\.\d*)?([eE]-[1-9]\d*)))\s+){3}(\+?((\.\d+([eE]-\d+)?)|((0+(\.0*)?|\.0+)([eE]\+?\d+)?)|(0+\.\d*([eE]-\d+)?)|((1|1\.0*)([eE]-\d+)?)|(\d(\.\d*)?([eE]-[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 = "0.0e10 .0e+10 .0 0e-10";
// 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/