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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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https://jex.im/regulex/
OP solved it, closing
":("is never a valid smiley (at least in this kata).They are smiling faces.
How is that a kata issue? You have a list of valid eyes, noses and mouths, and some examples of valid and invalid smilies. Create the combinations of valid parts yourself, and those will be the full list of possible valid smilies. For testing your regular expression, use regex101.com
it's not sorting properly for some tests. you can log the input to the console to see which test you're failing.
also, you are not supposed to call the function explicitly, the tests will do that for you
p.s, please mark your comment as spoiler if you are posting code snippets. and, this is not a kata issue, please use a question tag next time