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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.
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guess you're missing my point, let me rephrase myself.
The reason your regex passes is because of the \u0020 (which is just a normal space) and not because you are using \t.
There are 0 testcases that contain one or more spaces followed by a tab.
Hope that this makes it clearer for you ;)
it actually has a different meaning.
(putting everything between quotes so the space becomes visible.)
'\t' = a tab, usually used for spacing.
' ' = a space
'\s' = all whitespace characters including tabs and spaces.
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language? In what part of the test suite? Give the complete actual assertion message, please.