平台源生成器可用时，这段程序会输出什么？

using System;
using System.Text.RegularExpressions;

Console.WriteLine(CodeRules.IsValid("AB123"));
Console.WriteLine(CodeRules.IsValid("ab123"));

public static partial class CodeRules
{
    [GeneratedRegex("^[A-Z]{2}[0-9]{3}$", RegexOptions.CultureInvariant)]
    private static partial Regex CodePattern();

    public static bool IsValid(string value) => CodePattern().IsMatch(value);
}