Very nice approach indeed. Just to touch up on including uppercase vowels: 

$_ = 'A Lighthouse';

if (5 == keys %{{map {lc $_ => undef} m/([aeiou])/ig}}) {
  print "Found at least one of each vowel.\n";
}
else {
  print "Not all vowels were found.\n";
}

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In reply to Re^2: regex testing for ALL of the vowels in a scalar by Anonymous Monk
in thread regex testing for ALL of the vowels in a scalar by D'Oh!!

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