// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002607/stringbuilder-extractoperator

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        int endIndex;

​

        // C# Extension Method: StringBuilder - ExtractOperator

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

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

        Console.WriteLine(new StringBuilder("a").ExtractOperator());

        Console.WriteLine(new StringBuilder("1").ExtractOperator());

        Console.WriteLine(new StringBuilder(".").ExtractOperator().ToString());

        Console.WriteLine(new StringBuilder("..").ExtractOperator().ToString());

        Console.WriteLine(new StringBuilder(". .").ExtractOperator().ToString());

        Console.WriteLine(new StringBuilder("//*/ z").ExtractOperator(1, out endIndex).ToString());

        Console.WriteLine(endIndex);

    }

}