// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002168/string-matches

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        string pattern = @"\b\w+es\b";

        string input = "Who writes these notes?";

        // C# Extension Method: String - Matches

        var matches = input.Matches(pattern);

        foreach (Match match in matches)

        {

            Console.WriteLine("Found '{0}' at position {1}", 

                           match.Value, match.Index);

        }

    }

}