DLL_VINCheckLib/VINCheckLibrary/VINParser.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace VINCheckLibrary
{
    public class VINParser
    {
        static void Main(string[] args)
        {

        }

        public static string Parse(string VIN)
        {
            Regex regex = new Regex("^[A-HJ-NPR-Z0-9]{17}$");
            bool isLargeManufacturer = VIN[2] == '9';

            Regions parsedRegion = new Regions(VIN.Substring(0, 2));
            Years parsedYear = new Years(VIN[9]);
            Weight weight = new Weight();
            if (weight.CheckWeight(VIN) && regex.IsMatch(VIN))
            {
                return ("VIN: " + VIN + "\n" +
                "WMI: " + VIN.Substring(0, 3)) + "\n" +
                "VDS: " + VIN.Substring(3, 6) + "\n" +
                "VIS: " + VIN.Substring(9) + "\n" +
                "Region: " + parsedRegion.Region + "\n" +
                "Country: " + parsedRegion.Country + "\n" +
                "Year: " + parsedYear.Year + "\n" +
                (isLargeManufacturer ? "less" : "more") +
                " than 500 vehicles per year";
            }
            else return "Incorrect VIN!";
        }
    }
}