using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string text= "*-4d";

        string pattern = @"(<?<=.*?\*)([\-\+])(.\d{0,2})(?=(d))";

        var result= Regex.Match(text, pattern);

        Console.WriteLine(result);

    }

}