public static int annabacount(string ipfind) {

        int anCount = 0;
        string ipf = ipfind;
        anCount = Regex.Matches(ipf,".123").Count;

        return annabacount(ipfind);
    }

    static void Main(string[] args)
    {
        StreamReader sr = File.OpenText("D:\0000.txt");
        string ip="";
        Regex ipr = new Regex(@"172.29.1(23|36|24|41).[0-255]{3}:2944");



        while (!sr.EndOfStream) {
            ip = sr.ReadLine();

            Match match = ipr.Match(ip);
            annabacount(match.ToString());

            Console.WriteLine(match.ToString());
            Console.WriteLine(annabacount(match.ToString()));