Improved my code across the board tremendously. Should result in much better performance (even though it might not be noticeable). Also made my HTML a tiny bit more valid.
Improved compability for Internet Explorer -- even though it is still lacking more than I'd want it to.
New quick reference
Improved the highlightning
Improved the explanation for regexes
Patched up tons of tasks and added more robust tests.
Added two new tasks to the quiz (more coming!!!)
Added ratings to the quiz so you can compete with everyone else playing!
Improved tooltips performance (this was really bad in larger test samples)
Added a substitution box (remember /g affects replacements too!)
Added a community where you can share regular expressions!
I think these are all the changes that you'll actually notice, even though I have done a lot more work behind the scenes.
I hope you enjoy the changes! All form of feedback is awesome!