在switch语句中捕获组

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] args) {
        String input = "Hello, world!";
        Pattern pattern = Pattern.compile("(\\w+), (\\w+)!");
        Matcher matcher = pattern.matcher(input);

        if (matcher.matches()) {
            String greeting = matcher.group(1);
            String name = matcher.group(2);

            switch (greeting) {
                case "Hello":
                    System.out.println("Hello, " + name + "!");
                    break;
                case "Hi":
                    System.out.println("Hi, " + name + "!");
                    break;
                default:
                    System.out.println("Unknown greeting!");
                    break;
            }
        } else {
            System.out.println("No match found!");
        }
    }
}