@TXDIGIT[string]: Returns the number of characters in string that are hexadecimal digits (0-9 and A-F or a-f).

 

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

 

Example:

 

echo %@txdigit[123abc]

6

 

echo %@txdigit[123 ttt]

3