Ad Astra -HasMap

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

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String inputStr = scanner.nextLine();
        String regex = "(?<index>[\\\\|\\\\#]{1})(?<item>[A-z\\s+]+)\\1(?<date>[0-9]{2}[\\/]{1}[0-9]{2}[\\/]{1}[0-9]{2})\\1(?<calories>\\d{1,5})\\1";
        Pattern pattern = Pattern.compile(regex);

        int days = 0;
        HashMap<String, Integer> foodCalories = new HashMap<String, Integer>();
        Matcher matcher = pattern.matcher(inputStr);
        while (matcher.find()) {
            String item = matcher.group("item");
            int current = Integer.parseInt(matcher.group("calories"));
            foodCalories.put(item, current);
            days += current;
        }

        System.out.println("You have food to last you for: " + (days / 2000) + " days!");

        matcher = pattern.matcher(inputStr);
        while (matcher.find()) {
            String item = matcher.group("item");
            String date = matcher.group("date");
            int calories = Integer.parseInt(matcher.group("calories"));
            System.out.println("Item: " + item + ", Best before: " + date + ", Nutrition: " + calories);
        }
    }
}