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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.
That's what
evaldoes.$1+puts in the character+after every digit (apart from the last one but that's controlled by the first term inreplace).What does '$1+' do here? I'm assuming it coerces a string to its number representation once found by the regex, but how?