Post Office [Mimi]

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

public class _03_PostOfficce1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String[] message = scanner.nextLine().split("\\|");
        String first = message[0];
        String second = message[1];
        String third = message[2];

        String regFirstPart = "([$#%&*])([A-Z]+)(\\1)";
        Pattern p1st = Pattern.compile(regFirstPart);
        Matcher m1 = p1st.matcher(first);

        String firstLetters = "";
        if (m1.find()) {
            firstLetters = m1.group(2);
        }

        for (int i = 0; i < firstLetters.length(); i++) {
            char startLetter = firstLetters.charAt(i);
            int asciiCode = startLetter;

            String regSecondPart = "" + asciiCode + ":(?<length>[0-9]{2})";
            Pattern p2nd = Pattern.compile(regSecondPart);
            Matcher m2 = p2nd.matcher(second);
            int length = 0;
            if (m2.find()) {
                String l = m2.group("length").trim();
                length = Integer.parseInt(l);
            }

            String regThirdPart = "(?<=\\s|^)" + startLetter + "[\\S]{" + length + "}"+ "(?=\\s|$)";
            Pattern p3rd = Pattern.compile(regThirdPart);
            Matcher m3 = p3rd.matcher(third);

            if (m3.find()){
                String out = m3.group();
                System.out.println(out);
            }
        }
    }
}