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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.
FYI -- this won't fit all of the criteria. For example, get_hashtags 'this is not a legit hashtag: #123'
\w matches digits, too. Furthermore, it's not specified whether digits or other characters are allowed AFTER the first char after the hashtag. I assumed it would be twitter-like.
Nice work!
Grammar
Map-Reduce : )