Re^3: change [A-Z] to U, [a-z] to L with one regex?

[ikegami]

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

I'm pretty sure $1 eq "\u$1" can fail for some characters it shouldn't fail for.