using System;

using System.Text.RegularExpressions;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var replaceParams = new Dictionary<string,string>() {};

                                replaceParams.Add("_Percentage_", "%");

                                replaceParams.Add("_Per_", "/");

                                replaceParams.Add("_USD_", " $");

        var key = "d_Price_AED_Per_LOr_kg";

        foreach (var item in replaceParams)

        {

            key = key.Replace(item.Key, item.Value);

        }

​

        var hLabel = Regex.Replace(key, "(?<!^)([A-Z][a-z]|(?<=[a-z])[A-Z])", " $1");

        if (hLabel.IndexOf("_") > -1)

        {

            hLabel = hLabel.Substring(hLabel.IndexOf("_") + 1, hLabel.Length - hLabel.IndexOf("_")-1);

        }

​

        hLabel = hLabel.Replace("_", " ").Replace("/ ", "/");

        Console.WriteLine(hLabel);

    }

​

    private static string Doubler(Match match)

    {

        return (Convert.ToInt32(match.Value) * 2).ToString();

    }

}