taofan712

@echo off
set str=123ABC上中下
set /a n=0
:loop
set str=%str:~0,-1%
if  "%str%" neq "" (set /a n+=1 & goto loop)
echo 这个字符串是%n%位数 & pause>nul
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taofan712

@echo off
set str=123ABC上中下
:loop
set /a a+=1
set str=%str:~0,-1%
if "%str%"=="" (echo %a%&pause>nul ) else goto loop
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taofan712

@echo off
set "var=qwertyuioplkjhgfdsazxcvbnm"
call :strLen var long
echo;%long%
pause&exit /b 
:strLen 

(   SETLOCAL ENABLEDELAYEDEXPANSION
    set "str=A!%~1!"
    set "len=0"
    for /L %%A in (12,-1,0) do (
        set /a "len|=1<<%%A"
        for %%B in (!len!) do if "!str:~%%B,1!"=="" set /a "len&=~1<<%%A"
    )
)
( ENDLOCAL 
    IF "%~2" NEQ "" SET /a %~2=%len%
)
goto :eof
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很偏门，但很好用，不忍独享,文件出处http://www.it1352.com/328587.html