Remove Number from String

Code:

using System;
using System.Text.RegularExpressions;

class Program
{
    /// <summary>
    /// Remove digits from string.
    /// </summary>
    public static string RemoveDigits(string key)
    {
        return Regex.Replace(key, @"\d", "");
    }

    static void Main()
    {
        string input1 = "Dot123Net456Perls";
        string input2 = "101Dalmatations";
        string input3 = "4 Score";

        string value1 = RemoveDigits(input1);
        string value2 = RemoveDigits(input2);
        string value3 = RemoveDigits(input3);

        Console.WriteLine(value1);
        Console.WriteLine(value2);
        Console.WriteLine(value3);
    }
}