// 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"(?mx)(?(DEFINE)
(?<n>[-+]?\d+(?:\.\d+)?)
(?<a>\s*[-+*\/]\s*)
(?<g>\((?:(?&n)|(?&g))(?&a)(?:(?&n)|(?&g))\))
)
^(?&g)$").unwrap();
let string = "(14.0 + 46.0)
((5.0 - 50.0) - 15.0)
(15.0 - (5.0 - 50.0))";
// result will be an iterator over tuples containing the start and end indices for each match in the string
let result = regex.captures_iter(string);
for mat in result {
println!("{:?}", mat);
}
}
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/