FancyBarcodes

package JavaFundamentals.FinalExamExamples;

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

public class FancyBarcodes_02 {
    public static void main(String[] args) {
        Scanner read = new Scanner(System.in);
        // regex --> "@#+(?<barcode>[a-zA-Z0-9A-Z]{6,})@#+"

        int loop = Integer.parseInt(read.nextLine());

        for (int index = 0; index < loop; index++) {
            // inside the loop we read barcode and compile the regex
            String barcode = read.nextLine();
            Matcher matcher = Pattern.compile("@#+(?<barcode>[a-zA-Z0-9A-Z]{6,})@#+").matcher(barcode);
          if (matcher.find()){
              matcher = Pattern.compile("\\d").matcher(barcode); // --> taking the digit from the regex
              StringBuilder group = new StringBuilder();
              while(matcher.find()){
                  group.append(matcher.group());
              }
              if (group.toString().length() == 0){
                  group = new StringBuilder("00");
              }
              System.out.printf("Product group: %s%n",group.toString());
          }else{
              System.out.println("Invalid barcode");
          }
        }






    }
}