using System;

using System.Text.RegularExpressions;

​

public class Example

{

    public static void Main()

    {

        string pattern = @"^[A-Za-z0-9\/?:().,']+$";

        string[] inputs = new string[] {

            "test123",

            "test&test",

            "test.12.test",

            "test & test",

            "test &test",

            "test& test",

        };

        RegexOptions options = RegexOptions.Singleline;

        foreach (var m in inputs)

        {

            if(Regex.IsMatch(m, pattern, options))

            {

                Console.WriteLine("Match: "+ m);

            }

        }

    }

}