Lists all Unicode digits in a Console application, including astral characters

all_unicode_digits.cs

public class AlllUnicodeDigits {
    public static void Main()
    {
        var unicodeEncoding = new UnicodeEncoding(!BitConverter.IsLittleEndian, false);
        Console.InputEncoding = unicodeEncoding;
        Console.OutputEncoding = unicodeEncoding;
    
        var sb = new StringBuilder();
        for (var codePoint = 0; codePoint < 0x10ffff; codePoint++)
        {
            var isSurrogateCodePoint =
               codePoint <= UInt16.MaxValue 
               && (  char.IsLowSurrogate((char) codePoint) 
                  || char.IsHighSurrogate((char) codePoint)
                  );
    
            if (isSurrogateCodePoint)
                continue;
    
            var codePointString = char.ConvertFromUtf32(codePoint);
    
            if (Regex.IsMatch(codePointString, @"\d"))
                sb.AppendFormat("{0} ", codePointString);
        }
        Console.WriteLine(sb.ToString());
    
        Console.ReadKey();
    }
}