@VOWELS — Returns the number of vowels in a string.

Syntax:
%@VOWELS[string]

stringthe text to examine

Only vowels in the Latin alphabet are counted: A, E, I, O, U, and Y. Accented variants in the range U+00C0 through U+00FF (Unicode’s Latin-1 Supplement) are also recognized.

echo %@vowels[Déjà vu]