using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        Regex regex = new Regex(@"(?msi)(?:(\s*/\*.*?\*/)|(([a-z0-9#. \[\]=\"":_-]+)\s*(?:,\s*|{))+(?:(\s*/\*.*?\*/)|(?:\s*([a-z0-9 -]+\s*):\s*([a-z0-9#,<>\?%. \(\)\\\/\*\{\}:'\""!_=-]+);?))*\s*})");

        var regexMatch = regex.Match("   a, abbr, acronym, address, applet, article, aside, audio, b, big, blockquote, body, canvas, caption, center, cite, code {");

        Console.WriteLine(regexMatch.Captures.Count);

    }

}