This one can be easily solved without using a regex.
For example, here is a one-liner featuring the good ol' tr (aka y) operator, punctuated with just a few & characters (sorry couldn't resist):
perl -ne 'y&a&&&&y&e&&&&y&i&&&&y&o&&&&y&u&&&&print' words.txt
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| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||