Ad Astra

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

public class Problem2 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String regex = "(\\#|\\|)(?<item>[A-Za-z\\s]+)\\1(?<date>\\d{2}\\/\\d{2}\\/\\d{2})\\1(?<calories>\\d{1,5})\\1";

        String input = scan.nextLine();

        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(input);

        List<String> item = new ArrayList<>();
        List<String> date = new ArrayList<>();
        List<String> calories = new ArrayList<>();
        int daysLast = 0;
        int dailyCalorie = 2000;
        int calorieFromFood = 0;

        while (matcher.find()) {
            calorieFromFood += Integer.parseInt(matcher.group("calories").substring(0));
            item.add(matcher.group("item"));
            date.add(matcher.group("date"));
            calories.add(matcher.group("calories"));

        }
        daysLast = calorieFromFood / dailyCalorie;
        System.out.println(String.format("You have food to last you for: %d days!", daysLast));

        if (item.size() > 0 && date.size() > 0 && calories.size() > 0) {
            for (int i = 0; i < calories.size(); i++) {
                System.out.println(String.format("Item: %s, Best before: %s, Nutrition: %s", item.get(i), date.get(i), calories.get(i)));
            }
        }
    }
}