How To Validate HTML Color

I am extracting color codes from css files using regex and would like to convert them into colours. A few examples of colour codes:
#000;
#669933;
#fff

This is my Regex pattern:
VB.NET
Dim HTMLColor As String = Regex.Match(Input, "#[wd]+?(?=[;
])").Value

To convert the colour I am using:
VB.NET
System.Drawing.ColorTranslator.FromHtml(HTMLColor)

This will throw an exception if the HTMLColor is not a valid "html colour". Because some css colors are not escaped with a ";" I have relaxed my regex a little meaning that it can yield #div as a result for example. I just wondered if there is a way to verify the HTML Colour code before the conversion, without having to use a Try..