// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002604/stringbuilder-extracthexadecimal

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        int endIndex;

​

        // C# Extension Method: StringBuilder - ExtractHexadecimal

        Console.WriteLine(new StringBuilder(" ").ExtractHexadecimal());

        Console.WriteLine(new StringBuilder("0x2A").ExtractHexadecimal().ToString());

        Console.WriteLine(new StringBuilder("0x0x2A").ExtractHexadecimal(2).ToString());

        Console.WriteLine(new StringBuilder("0x0x2FUL").ExtractHexadecimal(2, out endIndex).ToString());

        Console.WriteLine(endIndex);

    }

}