Fancy Barcodes

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

public class FancyBarcodes {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Pattern pattern = Pattern.compile("(@[#]+)(?<product>[A-Z][A-Za-z0-9]{3,}[A-Z])(@[#]+)");
        Pattern pattern1 = Pattern.compile("[\\d*]");
        int n = Integer.parseInt(scanner.nextLine());

        for (int i = 0; i < n; i++) {
            String barcode = scanner.nextLine();
            Matcher matcher = pattern.matcher(barcode);
            StringBuilder productGroup = new StringBuilder();
            if (matcher.find()) {
                String product = matcher.group("product");
                Matcher matcher1 = pattern1.matcher(product);
                if (!matcher1.find()) {
                    System.out.println("Product group: " + "00");
                } else {
                    for(int j = 0; j < product.length(); j++){
                        final char c = product.charAt(j);
                        if(c > 47 && c < 58){
                            productGroup.append(c);
                        }
                    }
                    System.out.println(String.format("Product group: %s", productGroup.toString()));
                }
            } else {
                System.out.println("Invalid barcode");
            }
        }
    }
}