using System;

using System.Xml.Serialization;

using System.IO;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        var source = @"

АП-1234-1

АП-1234-

АП-1234-11

АыЫП-12334-1343

АЫП-1234-15

АП-1234-1ву512

АвП-1в34-в1

АЪП-1234-1в

АП-1234-14

АП-1234-

АП-1234-116

АыЫП-123334-1343

АЫП-12fd34-15

АП-1234-1ву512

АвП-1в34-в1

АЪП-1234-1в";

        var regex = new Regex(@"^[А-Я]{2}-[0-9]{4,5}-[0-9]+$", RegexOptions.Multiline);

        var matches = regex.Matches(source);

        foreach(Match match in matches)

        {

            Console.WriteLine(match.Value);

        }

    }

}