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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var pattern = @"(?<!\S)(?=.)(0|([1-9](\d*|\d{0,2}(,\d{3})*)))?(\.\d*[1-9])?(?!\S)";
            var regex = new Regex(pattern);
            
            var shouldMatch = new[] 
            {
                "100,000",
                "100000",
                "999.999",
                "90.0009",
                "1,000,000",
                "1,000,023.999",
                "0.111",
                ".111",
                "0",
                "dogs 123 cats 456",
                "111 222 333"
            };
            
            var shouldNotMatch = new[] 
            {
                "",
                "1,1,1.111",
                "000,001.111",
                "1000,000",
                "999.",
                "0.",
                "111.110000",
                "1.1.1.111",
                "9.909,888",
            };
            
            Console.WriteLine("SHOULD MATCH:");
            
            foreach (var input in shouldMatch) 
            {
                var matches = regex.Matches(input).OfType<Match>();
                Console.WriteLine("{0,-18}: {1}", input, matches.Any() ? string.Join(" : ", matches.Select(m => m.Value)) : "no match");
            }
            
            Console.WriteLine("------------------");
            
            Console.WriteLine("SHOULD NOT MATCH:");
            
            foreach (var input in shouldNotMatch) 
            {
                var matches = regex.Matches(input).OfType<Match>();
                Console.WriteLine("{0,-18}: {1}", input == "" ? "(empty)" : input, matches.Any() ? string.Join(" : ", matches.Select(m => m.Value)) : "no match");
            }
        }
    }
}

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Compilation time: 0.17 sec, absolute running time: 0.16 sec, cpu time: 0.12 sec, average memory usage: 18 Mb, average nr of threads: 4