// 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)^[^\W_]+(?:[-_.][^\W_]+){0,3}$").unwrap();
let string = "exampletag
example-tag
ex-ample-tag
ex_ample_tag
ex-ample_tag
ex.am-ple_tag
Ex.4m-p1e_t4g
ex-am-pl-et-ag
// and variations where there's more than 3 `-` `_` or `.`
-exampletag
// no starting symbols
exampletag-
// no trailing symbols";
// 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/