批处理判断是否特殊字符的实现代码(转自：www.jbxue.com)

@echo off

set Input=S 
set /p Input=Please input a number:
set Filter=S%Input%echo off >nul 2 >nul 
rem replace " with >
set Filter=%Filter:"=>% 
echo %Filter%a
rem & 
if "%Filter%"=="S " echo and 
rem ^
if "%Filter%"=="Secho off 2 " echo fan
rem >
if "%Filter%"=="S off 2 " echo gtr
echo %Filter%