SumAllValues

package StringAndTextProcessing.Exercises;

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

public class SumAllValues {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        String keys = reader.readLine();
        String text = reader.readLine();

        String startKey = "\\b([A-Za-z_]+)(\\d+)"; // group 1 is the key
        String endKey = "(\\d+)([A-Za-z_]+)\\b"; //group 2 is the key

        Pattern start = Pattern.compile(startKey);
        Pattern end = Pattern.compile(endKey);

        Matcher startMatch = start.matcher(keys);
        Matcher endMatch = end.matcher(keys);

        String startS = "";
        String endS = "";

        if (startMatch.find()) {
            startS = startMatch.group(1);
        }
        if (endMatch.find()) {
            endS = endMatch.group(2);
        }

        String findNumbers = "(\\d+\\.?\\d+)";
        Pattern number = Pattern.compile(startS + findNumbers + endS);

        double sum = 0;
        Matcher numbers = number.matcher(text);
        while (numbers.find()) {
            sum += Double.parseDouble(numbers.group(1));
        }

        int sumInt = 0;

        if (endS.isEmpty() || startS.isEmpty()) {
            System.out.println("<p>A key is missing</p>");
            return;
        }
        if (sum == 0) {
            System.out.println("<p>The total value is: <em>nothing</em></p>");
        } else if ((int)sum == sum){
            System.out.printf("<p>The total value is: <em>%d</em></p>", (int)sum);
        }
        else {
            System.out.printf("<p>The total value is: <em>%.2f</em></p>", sum);
        }
    }
}