How many words of power did I shout?
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ul
xo
[aeiou]+

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tiidkloul is the only word that doesn't have the same amount of vowel sequences as the number supposed to be printed. Therefore we need to match the word to give it an extra vowel sequence. ou will only match tiidkloul and we can then replace ou with oxo which creates the extra sequence.
My initial approach wasn't this simple, but was build around removing all consonants, then removing a few vowel sequences (ai|ii|aa|...) and then finally counting the numbers of letters. But thanks to @Martin Büttner for thinking of [aeiou]+ instead.