[jbdeboer]

Great work; do you have a blog post discussing the implementation?

It would be even cooler, and much faster, if all the work could be done client-side. e.g. similar to debuggex.com

[thoradam]

If you select JavaScript as the regex implementation it seems to do the work client-side.

[nicmart]

Unlucky I'm not the author of the tool... :)