// 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"(?<!\d)\d{3}(?!\d)").unwrap();
let string = "a 123 234 b
- Has to match 123 and 234
a 123_234 b
- Has to match 123 and 234
aa123 234 b
- Has to match 123 and 234
a0123 234 b
- Has to match only 234
123a234 b
- Has to match 123 and 234
a 123 234
- Has to match 123 and 234";
// 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/