using System;

using System.Text.RegularExpressions;

public class Program

{

    private static readonly Regex _validationRegex = new(@"0*([0-9]+\.?[0-9]*)$", RegexOptions.Compiled);

    private static readonly string _pattern = @"0*([0-9]+\.?[0-9]*)$";

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var matches = Regex.Matches("00000.00220", _pattern);//_validationRegex.Matches("000.031");

        if (matches.Count > 0) {

            foreach (Match match in matches)

            {

                string extractedText = match.Groups[5].Value;

                Console.WriteLine("text: " + match.Groups.Count);

            }

        }

    }

}