// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002603/stringbuilder-extractcommentsingleline

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        int endIndex;

​

        // C# Extension Method: StringBuilder - ExtractCommentSingleLine

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

        Console.WriteLine(new StringBuilder("//z").ExtractCommentSingleLine().ToString());

        Console.WriteLine(new StringBuilder("////z").ExtractCommentSingleLine(2).ToString());

        Console.WriteLine(new StringBuilder("////z" + Environment.NewLine + "z").ExtractCommentSingleLine(2, out endIndex).ToString());

        Console.WriteLine(endIndex);

    }

}

​