using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var regex = @"[^-?\d+.]";

        Console.WriteLine(Regex.IsMatch("?", regex)); // wrong 

        Console.WriteLine(Regex.IsMatch("-", regex));

        Console.WriteLine(Regex.IsMatch("+", regex)); // wrong

        Console.WriteLine(Regex.IsMatch("0", regex));

        Console.WriteLine(Regex.IsMatch(",", regex));

        Console.WriteLine(Regex.IsMatch(".", regex));

    }

}