具有捕获组和反向引用的正则表达式如何在Java中匹配？

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

public class RegexExample {
    public static void main(String[] args) {
        String input = "123abc456def789ghi";
        String pattern = "(\\d+)([a-z]+)(\\d+)";

        Pattern compiledPattern = Pattern.compile(pattern);
        Matcher matcher = compiledPattern.matcher(input);

        if (matcher.find()) {
            System.out.println("捕获组1: " + matcher.group(1));
            System.out.println("捕获组2: " + matcher.group(2));
            System.out.println("捕获组3: " + matcher.group(3));
        } else {
            System.out.println("没有匹配到任何内容");
        }
    }
}

捕获组1: 123
捕获组2: abc
捕获组3: 456