public class CSSParser
{
    const string CSSComments = @"(?<!"")\/\*.+?\*\/(?!"")";
    const string CSSGroups = @"(?<selector>(?:(?:[^,{]+),?)*?)\{(?:(?<name>[^}:]+):?(?<value>[^};]+);?)*?\}";

    //return the contents of a single css file, broken up into classes
    public static CSSData ReadCSS(string cssPath)
    {
        string cssString = File.ReadAllText("Assets/Resources/OEBPS/"+cssPath);
        cssString = Regex.Replace(cssString, CSSComments, "");

        Regex rStyles = new Regex(CSSGroups, RegexOptions.IgnoreCase);
        char[] whiteSpace = {'\r','\n','\f','\t','\v'};

        MatchCollection MatchList = rStyles.Matches(cssString);
        CSSData CSS = new CSSData();
        CSS.Path = cssPath;

        foreach(Match item in MatchList)
        {
            if (item != null && item.Groups != null && item.Groups["selector"] != null && item.Groups["selector"].Captures != null &&
                item.Groups["selector"].Captures[0] != null && !string.IsNullOrEmpty(item.Groups["selector"].Value))
            {
                string Selector = item.Groups["selector"].Captures[0].Value.Trim();
                List<KeyValuePair<string, string>> Style = new List<KeyValuePair<string, string>>();

                for(int i = 0; i < item.Groups["name"].Captures.Count; i++)
                {
                    string Class = item.Groups["name"].Captures[i].Value;
                    string Value = item.Groups["value"].Captures[i].Value;

                    if (!string.IsNullOrEmpty(Class) && !string.IsNullOrEmpty(Value))
                    {
                        Class = Class.Trim(whiteSpace).Trim();      //trim regular spaces plus \n etc.
                        Value = Value.Trim(whiteSpace).Trim();

                        if (!string.IsNullOrEmpty(Class) && !string.IsNullOrEmpty(Value))
                            Style.Add(new KeyValuePair<string, string>(Class, Value));
                    }
                }

                CSS.CSS.Add(new KeyValuePair<string, List<KeyValuePair<string, string>>>(Selector,Style));
            }
        }

        return CSS;
    }
}