:ReplaceEqual
set "str=%~1"
set output=
:CheckEqual
if "%str:~0,1%"=="=" (
set "output=%output%置換後文字列"
set "str=%str:~1%"
) else (
set "output=%output%%str:~0,1%"
set "str=%str:~1%"
)
if defined str goto :CheckEqual
exit /b