批处理二 set 替换和截取函数的使用

@echo off
set var=hell,world,ni,hao

set ans=%var:,= google %   //替换函数 将所有的逗号替换成google

echo %ans%

set var=abcdefghijklmn

set  ans=%var:~1,3%        //截取函数 bcd

echo %ans%

set  ans=%var:~1,5%        //bcdef 

echo %ans%

set  ans=%var:~1,-5%       //bcdefghi

echo %ans%

set  ans=%var:~-5%         //jklmn 

echo %ans%