7.4.43. LOWER

Returns a new string with the characters of 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 is not specified, the default is to convert the remainder of the string.

Here are some examples:

Example 7.56. Builtin function LOWER

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