using System;

using System.Text.RegularExpressions;

​

namespace Rextester

{

    public class Program

    {

        public static void Main(string[] args)

        {

            //Your code goes here

            Console.WriteLine(Regex.Match("anything 876.8 anything", @"\d+\.*\d+").Value);

            Console.WriteLine(Regex.Match("anything 876 anything", @"\d+\.*\d+").Value);

            Console.WriteLine(Regex.Match("$876435", @"\d+\.*\d+").Value);

            Console.WriteLine(Regex.Match("$876.435", @"\d+\.*\d+").Value);

        }

    }

}