using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string myValueBeingTested = "asdf";

        string theResultValue = myValueBeingTested switch

        {

            var x when 

                Regex.IsMatch(x, "[a..z]+") => "everything is lowercase",

            var y when

                Regex.IsMatch(y, "[A..Z]+") => "EVERYTHING IS UPPERCASE",

            "Something Specific"         => "The Specific One",

            _                            => "The default, no match scenario"

        };

        Console.WriteLine(theResultValue);

    }

}