中国DOS联盟

(echo string&echo.)|findstr /o ".*"

set/p x=input:
for /f "skip=1 delims=:" %%i in ('^(echo "%x%"^&echo.^)^|findstr /o ".*"') do set/a l=%%i-5
echo %l%
pause

echo string>t&for %a in (t) do set/a z=%~za-2&del t

SETLOCAL ENABLEDELAYEDEXPANSION
SET "TMPITEM=Hello World!"

:: FINDSTR /O法，添加了空判断以适应TMPITEM=空的情况
ECHO !TIME!
IF DEFINED TMPITEM (
        FOR /F "skip=1 delims=:" %%I IN ('^(echo "%TMPITEM%"^&echo.^)^|findstr /o ".*"') DO (
                        SET /A "TMPITEM_LEN = %%I - 4"
        )
) ELSE (
        SET "TMPITEM_LEN=0"
)
ECHO !TIME!
ECHO %TMPITEM_LEN%

:: 逐个字符计数法
SET "TMPITEM_LEN=0"
ECHO !TIME!
IF DEFINED TMPITEM (
        :GetLenLoop
        SET "TMPTMP=!TMPITEM:~%TMPITEM_LEN%,1!" && SET /A "TMPITEM_LEN += 1" && GOTO :GetLenLoop
)
ECHO !TIME!
ECHO !TMPITEM_LEN!

ENDLOCAL