It's a small thing, but the screen shot at codeproject doesn't appear to be displayed at the proper dimensions and it makes it hard to read as a result. Possibly use a free app (google picasa etc.) to resize it to the desired dimensions and upload the resized image to codeproject.
I haven't had chance to apply the application to a project yet as most of my regex projects don't require regex trees, but I will certainly give it a shot when I have need. Thanks.