Regular Expression Capture Groups

• Capture groups:

  
  use regex::Regex;
  
  let re = Regex::new(r"(\w+)").unwrap();
  let text = "Hello world";
  
  for cap in re.captures_iter(text) {
      println!("Match: {}", &cap[1]);
  }
  
  

• Named capture groups:

  
  use regex::Regex;
  
  let re = Regex::new(r"(?<word>\w+)").unwrap();
  let text = "Hello world";
  
  for cap in re.captures_iter(text) {
      println!("Match: {}", &cap["word"]);
  }