using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        //The goal is to remove hashtags & urls, each pattern used separately works but not both

        var input = "asdads sdfdsf #burgers, #rabbits dsfsdfds #sdf http://fggttg.com";

        var pattern= @"http[^\s,]+|#\w+";

​

        var regex = new Regex(pattern);

        var matches = regex.Matches(input);

        foreach (var match in matches)

        {

            Console.WriteLine(match);

        }

        var result = regex.Replace(input, "" );

        Console.WriteLine(result);

    }

}