This one can be easily solved without using a regex. For example, a one-liner featuring the good ol' tr (aka y) operator, punctuated with just & characters (sorry couldn't resist): 

perl -ne 'y&a&&&&y&e&&&&y&i&&&&y&o&&&&y&u&&&&print' words.txt

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In reply to Re: regex to find vowels in anyorder (obfuscated) by eyepopslikeamosquito
in thread regex to find vowels in anyorder by varghees

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