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Putting a ^ inside the closed bracket means something completely different than putting it outside the brackets. Putting it inside the brackets makes it match all characters EXCEPT the ones inside the bracket. So instead of writing [bcdfghjklmnpqrstvwxyz], we can write [^aeiou]
Weather Observation Station 9
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MySQL solution
From my HackerRank solutions.
Putting a ^ inside the closed bracket means something completely different than putting it outside the brackets. Putting it inside the brackets makes it match all characters EXCEPT the ones inside the bracket. So instead of writing [bcdfghjklmnpqrstvwxyz], we can write [^aeiou]