// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002166/string-ismatch

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        string[] partNumbers= { "1298-673-4192", "A08Z-931-468A", 

                              "_A90-123-129X", "12345-KKA-1230", 

                              "0919-2893-1256" };

        string pattern = @"^[a-zA-Z0-9]\d{2}[a-zA-Z0-9](-\d{3}){2}[A-Za-z0-9]$";

        foreach (string partNumber in partNumbers)

        {

            // C# Extension Method: String - IsMatch

            var result = partNumber.IsMatch(pattern);

            Console.WriteLine("{0} {1} a valid part number.", partNumber, result ? "is" : "is not");

        }

    }

}