using System;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
    string input = @"\test";
    bool result = !Regex.IsMatch(input, @"[""'\\]+");  // result is true if no match
    if (!result) {
        Console.WriteLine("Comments cannot contain quotes (double or single) or slashes.");
    }

    }
}