// 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"^\s*([x])\s*([-+*\/])\s*(^|[ \(])\s*([-]?[0-9][\.\,\][0-9]*)\s*(^|[ \)])(?:\s*([-+*\/])\s*(^|[ \(])((?:[-])?[0-9][\.\,\][0-9]*))\s*(^|[ \)])*$").unwrap();
let string = "x* (-55) * (-0.58) ";
// 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/