y/[A-Z]/U/, y/[a-z]/L/;

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Doctrin didn't ask to change the characters [ or ] to U or L 

y/A-Z/U/, y/a-z/L/;

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In reply to Re^2: change [A-Z] to U, [a-z] to L with one regex? by jwkrahn
in thread change [A-Z] to U, [a-z] to L with one regex? by Doctrin

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