// 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+年\d+月\d+日).*新增本土.*确诊病例(\d+)例.*无症状感染者(\d+)例.*其中(\d+)例确诊病例为此前无症状.*，(\d+)例确诊病例和(\d+)例无症状感染者.*相关风险人群排查中发现").unwrap();
let string = "市卫健委今早（22日）通报：2022年4月21日0—24时，新增本土新冠肺炎确诊病例1931例和无症状感染者15698例，其中143例确诊病例为此前无症状感染者转归，1685例确诊病例和15551例无症状感染者在隔离管控中发现，其余在相关风险人群排查中发现
";
// 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/