Dynamic substrings of SET command in batch-file -

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i want batch-file testing substrings of set command, %var:~5,3%

see below:

@echo off setlocal enabledelayedexpansion  set var=abcdefghijklmnopqrstuvwxyz echo. echo string: abcdefghijklmnopqrstuvwxyz echo. echo samples of substrings: echo ~5,3   : %var:~5,3% echo.~5 : %var:~5% echo.~0,-2  : %var:~0,-2% echo. echo.test more: (type 000 exit command prompt) :loop set /p "substr=~" echo.!var:~%substr%! echo. if %substr%==000 exit goto:loop

output input's user : ~5

fghijklmnopqrstuvwxyz

and output input's user : ~5,2

var:~5,2

what solution?

thnx.

:loop set /p "substr=~" if "%substr%"=="000" exit echo(!var:~%substr%! echo( goto loop

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