Nether Realms

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

public class Main {

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

        String numberRegex = "[+-]?\\d+\\.?\\d*";
        String operationRegex = "[*\\/]+";
        String delimiterRegex = ",\\s*";

        Map <String,List<Double>> demonsHash = new TreeMap<>();
        String[] demons = scanner.nextLine().split(delimiterRegex);

        for (int i = 0; i < demons.length; i++) {
            double health = 0;
            double damage = 0;

            List<Double> healthDamage = new ArrayList<>();
            String currentDemon = demons[i].replaceAll(" ","");

            for (int j = 0; j < currentDemon.length(); j++) {
                char currentChar = currentDemon.charAt(j);
                if (Character.isLetter(currentChar)){
                    health += currentChar;
                }
            }
            Pattern pattern = Pattern.compile(numberRegex);
            Matcher numbers = pattern.matcher(currentDemon);

            while(numbers.find()){
                damage += Double.parseDouble(numbers.group());
            }

            Pattern pattern1 = Pattern.compile(operationRegex);
            Matcher delimiters = pattern1.matcher(currentDemon);

            while(delimiters.find()){
                String signsSequence = delimiters.group();
                for (int j = 0; j < signsSequence.length(); j++) {
                    if (signsSequence.charAt(i) == '*'){
                        damage *= 2;
                    }
                    else if (signsSequence.charAt(i) == '/') {
                        damage /= 2;
                    }
                }
            }
            healthDamage.add(health);
            healthDamage.add(damage);

            demonsHash.put(currentDemon,healthDamage);
        }

        demonsHash.forEach((key, value) -> {
            System.out.print(key + " - ");
            for (int i = 0; i < value.size(); i++) {
                if (i == 0) {
                    System.out.printf("%.0f health, ", value.get(i));
                } else {
                    System.out.printf("%.2f damage%n", value.get(i));
                }
            }
        });

    }
    }