Validate Norwegian Mobile Numbers, C#

Validate Norwegian Mobile Numbers

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester{
    
    public class Program
    {
        public static void Main(string[] args)
        {
            var validNumbers = new string[]{"+47 489 95 764", "47 48 99 57 64", "982 70 723", "+47 98 27 07 23"};
            var invalidNumbers = new string[]{"+47 689 95 764", "47 78 99 57 64", "382 70 723", "+47 58 27 07 23"};
            
            Console.WriteLine("**** These are valid numbers ****");
            foreach(var number in validNumbers){
                validateAndLogNumber(number);
            }
            
            Console.WriteLine();
            Console.WriteLine("**** These are not valid numbers ****");
            foreach(var number in invalidNumbers){
                validateAndLogNumber(number);
            }
            
        }
        
        public static void validateAndLogNumber(string number){
            Console.WriteLine(string.Format("The number: \"{0}\" is {1}a valid mobilephone number!", number, (MobilephoneNumberValidator.Validate(number) ? "" : "not ")));
        }
               
    }
    
    public static class MobilephoneNumberValidator
    {
        private static readonly Regex _matcher = new Regex(@"(?:(?:^*(?:\+?47[49]))|(?:^[49]))\d{7}$");
        private static readonly Regex _replacer = new Regex(@"\s+");
        
       public static bool Validate(string number)
       {
           return _matcher.IsMatch(_replacer.Replace(number, ""));
       }
    }
    
}


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