Forums Scripts & Popups Upper/Lower case version of $len???

Is there an upper or lower case version of $len?
Or a way to make a string?
$upper($len(BlAh)), and the other way around both return 4.

Usage:
$lowerlen(text) - returns $len of the lower cased letters only
$upperlen(text) - returns $len of the upper cased letters only
EG
$upperlen(qweRTYUIOP) will return 7
and
$lowerlen(qweRTYUIOP) will return 3

Alternatively, use $regex($1-,/[a-z]/g) for lowercase and $regex($1-,/[A-Z]/g) for uppercase

Thanks Guys