Filter subdirectories when it's not equal to something.

Hi, I'm trying to search for directories that don't match a certain criteria. I want to get just the subdirectories not starting with 'F'.

D:\root\D1234
D:\root\D9876
D:\root\F1234
D:\root\F9876
D:\root\A1234

This is what I'm doing at the moment but it's not working.

                var pattern = new Regex("^[^F].*");
                var dirs = from d in Directory.EnumerateDirectories(Path, "*", SearchOption.TopDirectoryOnly)
                           where pattern.IsMatch(d)
                           select d;

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This code returns all the subdirectories ignoring the filter expression.
I think it's looking at the root directory instead of looking in the subdirectories of \root. So because the root starts with 'D\' it thinks it's all good. If I change the regular expression to the one below, I get nothing.

   var pattern = new Regex("^[^D].*");

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