lower

>>-lower(+---+--+---------+---)----------------------><
         +-n-+  +-,length-+

Returns a new string with the characters of the target string beginning with character [n] for [length] characters converted to lowercase. If [n] is specified, it must be a positive whole number. If [n] is not specified, the case conversion will start with the first character. If [length] is specified, it must be a non-negative whole number. If [length] the default is to convert the remainder of the string.

String class - lower method

"Albert Einstein"~lower      ->    "albert einstein"
"ABCDEF"~lower(4)            ->    "ABCdef"
"ABCDEF"~lower(3,2)          ->    "ABcdEF"