Answer
$[a − z]∗(a | e | i | o | u)[a − z]∗$
Work Step by Step
All words that are written in lower-case letters and contain at least one of the vowels a, e, i, o, or u will be have below language.
--$[a − z]∗(a | e | i | o | u)[a − z]∗$
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