// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002110/string-extractint64

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.IO;

​

public class Program

{   

    public static void Main()

    {   

        string [] input = {"No. 9235125391235", "abc-153846685654"};

​

        foreach(var val in input)

        {

            //C# Extension Method: String - ExtractInt64

            var output = val.ExtractInt64();

            Console.WriteLine(output);

        }

    }

}