Loading collection data...
Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Sorry thats my fault, you can't see it because I marked my comment as spoiler.
However just read through the Ruby-doc of the RegExp class carefully and you will get it ;)
This comment is hidden because it contains spoiler information about the solution