@TALPHA[string]: Returns the number of alphabetic (a-z, A-Z) characters in string.

 

See also: @TALNUM, @TASCII, @TCNTRL, @TDIGIT, @TLOWER, @TPRINT, @TPUNCT, @TSPACE, @TUPPER, and @TXDIGIT.

 

Example:

 

echo %@talpha[abc123]

3

 

echo %@talpha[A B C]

3