using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		var text = "Top Rate: 8                      88,888";
		var result = Regex.Match(text, @"\bTop Rate\b.*?(\d(?:[\d,.\s]*\d)?)", RegexOptions.Singleline);
		if (result.Success)
		{
		    Console.WriteLine( new string(result.Groups[1].Value.Where(c => char.IsDigit(c)).ToArray()) );
		}
	}
}