Mirror Words

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MirrorWords {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String text = scanner.nextLine();

    //    String regex = "([@#])(?<firstWord>[A-z]{3,})\\1{2}(?<secondWord>[A-z]{3,})";
        String regex = "([@#])(?<firstWord>[A-z]{3,})\\1{2}(?<secondWord>[A-z]{3,})[#@]";

        List<String> mirrorWords = new ArrayList<>();

        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(text);

        int counter = 0;
        while (matcher.find()) {
            String firstWord = matcher.group("firstWord");
            String secondWord = matcher.group("secondWord");
            counter++;

            StringBuilder reversedWord = new StringBuilder(secondWord);
            reversedWord.reverse();
            if (firstWord.equals(reversedWord.toString())) {
                mirrorWords.add(firstWord + " <=> " + secondWord);
            }
        }
        if (counter != 0) {
            System.out.printf("%d word pairs found!%n", counter);
        } else {
            System.out.println("No word pairs found!");
        }
        if (counter > 0 && mirrorWords.size() > 0) {
            System.out.println("The mirror words are:");
            System.out.print(String.join(", ", mirrorWords));
        } else {
            System.out.println("No mirror words!");
        }
    }
}