02 Mirror words 100 / 100

package bg.softuni.javafundamentals;

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

public class Fin02_20Apr_MirrorWords {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String text = scanner.nextLine();
        Pattern hiddenWordPattern = Pattern.compile("([@#])(?<word>[A-Za-z]{3,})\\1\\1(?<mirror>[A-Za-z]{3,})\\1");
        //Pattern hiddenWordPattern = Pattern.compile("(@|#)(?<word>[A-Za-z]{3,})\\1\\1(?<mirror>[A-Za-z]{3,})\\1");
        Matcher matcher = hiddenWordPattern.matcher(text);

        int wordPairsCount = 0;
        List<String> mirrorPairs = new ArrayList<>();
        while (matcher.find()){
            wordPairsCount++;
            String firstWord = matcher.group("word");
            String secondWord = new StringBuilder(matcher.group("mirror")).reverse().toString();
            if (firstWord.equals(secondWord)){
                mirrorPairs.add(firstWord + " <=> " + matcher.group("mirror"));
            }
        }
        if (wordPairsCount == 0){
            System.out.println("No word pairs found!");
        } else {
            System.out.printf("%d word pairs found!%n", wordPairsCount);
        }
        if (mirrorPairs.isEmpty()) {
            System.out.println("No mirror words!");
        }else {
            System.out.println("The mirror words are:");
            System.out.print(String.join(", ", mirrorPairs));
        }
    }
}