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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 rocks. The lookahead and keeping matches techniques are essentials.
Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems.
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Cool. Took me a lot of lines to get an accepted solution. Gotta start learning regex