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Take Command / TCC Help v. 21

@SUBSTR[string,start,length] :  An older version of @INSTR. If the length is omitted, it will default to the remainder of string. If string includes commas, it must be quoted with double quotes ["] or back-quotes [`], or each comma must be preceded by an Escape character The quotes count in calculating the position of the substring. @INSTR, which has string as its last parameter, does not have this restriction.


Numeric input may be entered in either decimal format (a sequence of 0-9 digits) or in hexadecimal format ("0x" followed by a sequence of 0-F hex digits).




echo %@substr[this is useful,8]



echo %@substr[this is useful,8,-2]



echo %@substr["commas, they DO matter",9]

they DO matter"


echo %@substr[commas^, they DO matter,9]

they DO matter


See also: @INSTR.