Author here - This was written years ago, and I do not have the time to keep it up to date as I am doing a fulltime job + grad school. I just occasionally see these email pings.

If you dislike something, feel free to submit a suggested edit or whatever the functionality is now. If you are concerned regarding my attitude or how I come off to the community, then I apologize that I cannot be as responsive to comments as regularly as you prefer.

Submits suceeeded now. Thank you so much!

I'm unable to approve with "Description cannot be approved, recent changes from related record must be merged first.", perhaps it conflicted with my description eits?

Apologies, I've been inactive on this site for years (attended college, got a job, and haven't had time to spend here since) but saw emails related to these comments which led me to log back in and catch up. I'll try to get re-acquainted with the site to review and act on these issues.

Clearly the tests need to be updated then. Wonder if the author of the kata will see this soon.

The addition was a testcase that includes an escape as the last character (i.e. a "hanging escape"), as well as an edit to the description explicitly stating that there may not be a hanging escape.

Thanks! I'm currently waiting for Codewars to republish the Java version (probably takes a while to revalidate everything; wish it were asynchronous), directly in the kata (since the translation was apparently accepted). I haven't modified the JS yet.
Edit: Update published.

Fixed, thanks for catching it!

I realized I had made an oversight in the problem description of the original, meaning that this solution ended up being invalidated.

Fixed! Please take a look and see if there are any more issues. (it did end up invalidating both solutions)

Thanks for catching the oversights early on!

Thanks for the feedback! I'll work on fixing these shortly.

I've written a Java translation at http://www.codewars.com/kumite/5591eb80e6292a7fd50000e2?sel=5591eb80e6292a7fd50000e2. Additionally, I've reworded the description about multiple groups that was giving me and other users trouble.

It still isn't clear, but it's stated at this point, "The email must end with at least one set like this..."

There are typos in the class names (in Java) that should be fixed sooner rather than later (as they may invalidate solutions if fixed later since the testcase references the solution class by name).

Additionally, it might be helpful to make clearer that there is only one type of bracket; it took me a few re-reads to realize that.

For some reason the runner doesn't like compiling a bare interface in preload code, so I made it an inner member of a helper class. I believe that the requirement for a lambda is reasonable given that the goal is to return a function object, and other languages are returning true lambdas/closures.