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    Regular expressions are so satisfying! Great Kata, thanks xianpants!

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    This comment is hidden because it contains spoiler information about the solution

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    Sounds like you tried to find the index of an item that is not actually in the list. i.e. if my list was ['a', 'b', 'c'] and I asked for the index of 'a' I would get the value 0. If I asked for the index of 'd' however then that is not in my list so you get an error :(

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    I got all the tests passed. Nevertheless I can't submit it, it says STDERR "index ValueError: ' ' is not in list.
    What does it mean?