The Isle of Man TT Race - Regex, named groups, quantifiers

package com.company;

import javafx.util.Pair;

import javax.xml.crypto.dsig.keyinfo.KeyValue;
import java.lang.reflect.Array;
import java.security.KeyStore;
import java.text.Collator;
import java.text.DecimalFormat;
import java.util.*;
import java.util.function.Predicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collector;
import java.util.stream.Collectors;


public class Main {

    public static String encrypt(String racer, String geohash, int key){
        String decryptedGeohash = "";

        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < geohash.length(); i++) {
            char character = geohash.charAt(i);

            int encryptedCharacter = (int) character + key;

            builder.append((char) encryptedCharacter);
        }
        decryptedGeohash = builder.toString();

        return racer + " -> " + decryptedGeohash;
    }

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

        final String REGEX =  "^([\\#|\\$|\\%|\\*|\\&])(?<racer>[A-Za-z]+)\\1\\=(?<length>[0-9]+)\\!\\!(?<geohash>.+)$";
        Pattern pattern = Pattern.compile(REGEX);

        while(true){
            String input = scanner.nextLine();
            Matcher matcher = pattern.matcher(input);
            if(matcher.find()){
                String racer = matcher.group("racer");
                String message = matcher.group("geohash");
                int length = Integer.parseInt(matcher.group("length"));
                if(message.length() == length){
                    System.out.print("Coordinates found! ");
                    System.out.println(encrypt(racer, message, length));
                    return;
                }
            }
                System.out.println("Nothing found!");
        }
    }
}