using System;

using System.Linq;

using System.Collections.Generic;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string test = "/whitelist/locations/location/var-fields/var-field[@key=\"whitelist-entry\" and @value=\"8.0440147AA44A80\"]";

        string lastElement = test.Split('/').LastOrDefault();

        var reg = new Regex("\".*?\"");

        var matches = reg.Matches(lastElement);

        var key = matches[0];

        var @value = matches[1];

        Console.WriteLine("Key is: "+key);

        Console.WriteLine("Value is "+@value);

    }

}