using System;

    using System.Text.RegularExpressions;               

public class Program

{

    public static void Main()

    {

      var sample = "Total= 1082 fps= 21 q=29.0 size=    6144kB time=00:00:36.33";

      var match = Regex.Match( sample,@"(?<=fps=[\W])\d+");

​

      Console.WriteLine($"Total = {match.Value}");

    }

}