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Take Command / TCC Help v. 21

@TCNTRL[string]: Returns the number of ASCII control characters (0x00 - 0x1F or 0x7F) in string.

 

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

 

Examples:

 

echo %@tcntrl[abc]

0

 

set var=^r^n

echo %@tcntrl[%var]

2