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@TLOWER[string] : Returns the number of lower case letters in string.
See also: @TALNUM, @TALPHA, @TASCII, @TCNTRL, @TDIGIT, @TPRINT, @TPUNCT, @TSPACE, @TUPPER, and @TXDIGIT.
Example:
echo %@tlower[hello]
5
echo %@tlower[Hello]
4