// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002606/stringbuilder-extractnumber

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        int endIndex;

​

        // C# Extension Method: StringBuilder - ExtractNumber

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

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

        Console.WriteLine(new StringBuilder("1").ExtractNumber().ToString());

        Console.WriteLine(new StringBuilder(".1").ExtractNumber().ToString());

        Console.WriteLine(new StringBuilder(".1.1").ExtractNumber().ToString());

        Console.WriteLine(new StringBuilder(".1D").ExtractNumber().ToString());

        Console.WriteLine(new StringBuilder("1.1").ExtractNumber(1).ToString());

        Console.WriteLine(new StringBuilder("1.1F1").ExtractNumber(1, out endIndex).ToString());

        Console.WriteLine(endIndex);

    }

}