Question

 string myNumber = "3.44";

       Regex regex1 = new Regex(".");

       string[] substrings = regex1.Split(myNumber);

        foreach (var substring in substrings)
        {
            Console.WriteLine("The string is : {0} and the length is {1}",substring, substring.Length);
        }

        Console.ReadLine();

I tried to split the string by “.”, but it the splits return 4 empty string. Why?

Answer 1

. means “any character” in regular expressions. So don’t split using a regex – split using String.Split:

string[] substrings = myNumber.Split('.');

If you really want to use a regex, you could use:

Regex regex1 = new Regex(@"\.");

The @ makes it a verbatim string literal, to stop you from having to escape the backslash. The backslash within the string itself is an escape for the dot within the regex parser.