@TPUNCT[string]: Returns the number of punctuation characters in string, i.e. printable characters which are not alphanumeric or space.
See also: @TALNUM, @TALPHA, @TASCII, @TCNTRL, @TDIGIT, @TLOWER, @TPRINT, @TSPACE, @TUPPER, and @TXDIGIT.
Examples:
echo %@tpunct[.]
1
echo %@tpunct[+]
1
echo %@tpunct[:-)]
3
echo %@tpunct[.,a]
2