I did add that in post, as it occurred to me that was an oversight the OP would likely make if a bread crumb were not left. Of course, the updated code does not include it, so I was unfortunately not obvious enough. If you're concerned with the match performance, it's probably more reasonable to use 
$file =~ m{ [AaEeIiOoUu][aeiou] }x

[download]
since the simplified English the OP is likely attacking doesn't support two leading capital characters.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re^3: Vowel search by kennethk
in thread Vowel search by Noob@Perl

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