#$r =~ tr/[A-Z][a-z]/UUUUUUUUUUUUUUUUUUUUUUUUUULLLLLLLLLLLLLLLLLLLLLLL
+LLL/;
eval( '$r =~ tr/[A-Z][a-z]/'.('U' x 26).('L' x 26).'/' );

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[A-Z] is 28 characters, not 26, so your expression is wrong.

This will work: 

$r =~ tr/A-Za-z/UUUUUUUUUUUUUUUUUUUUUUUUUUL/;

[download]

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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