// 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"(?i)((?:(?(?=(e.g.|z.b.|Figs?\.|\d+\.\d))\2|[^.!?])+[.!?]))").unwrap();
  let string = "Test 10. Testing. Testing. Fig. 20. The decimal 20.3 should 20 still be sentence.Ok now. try 2.3. Explained reference to Figs. 2 and 3. ";
  
  // 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/