using System;

​

public static class TextTool

{

    public static int CountStringOccurrences(string text, string pattern)

    {

        int count = 0;

        int i = 0;

        while ((i = text.IndexOf(pattern, i)) != -1)

        {

            i += pattern.Length;

            count++;

        }

        return count;

    }

}

​

public class Program

{

    public static void Main()

    {

        string value = "zf3kabxcde224lkzf3mabxc51+crsdtzf3nab=";

        Console.WriteLine(TextTool.CountStringOccurrences(value, "abx"));

        Console.WriteLine(TextTool.CountStringOccurrences(value, "zf3"));

    }

}

​

​