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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 am not an expert in regex, but if I understand
[^#] means not a #
? means match the previous token [^#] zero or one time
literally match the character
So altogether, find a character that is NOT # followed by a #. Then if found, the author just replaces that with ''.
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This comment is hidden because it contains spoiler information about the solution