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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.
I think the + says to match whatever comes in front of it as many times in a row as possible. so (WUB)+ means match WUB, WUBWUB, WUBWUBWUB, etc. The g at the end means match globally, or match as many times as possible (instead of stopping after the first match).