using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var regex = new Regex("^([0-9 ]{5,6}) (.*)$");

        Console.WriteLine(regex.IsMatch("45646 asda asda 545 asda"));

        var match = regex.Match("45646 asda asda 545 asda");

        if (match.Success)

        {

            Console.WriteLine("Success");

            Console.WriteLine(match.Value);

            Console.WriteLine(match.Groups[1].Value);

            Console.WriteLine(match.Groups[2].Value);

        }

    }

}