using System;
using System.Text.RegularExpressions;
 
public class Test
{
    public static void Main()
    {
        // your code goes here
		string[] test = { "1.23", "123.45", "111", "12", "1", "0", "0.01", "0.0001", "0.00011", "0.000098", "1.000001", "-1.23", "-1", "-11", "-0.0000001" };
        foreach (var item in test)
        {
            var r = Regex.IsMatch(item, @"^(?!0\.0000)(?!^0$)\d+(\.\d+){0,1}");
            Console.WriteLine(item + ": " + r);
        }
    }
} 

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