rem 定义变量延迟环境，关闭回显
@echo off&setlocal enabledelayedexpansion
rem 读取a.txt所有内容
for /f "eol=* tokens=*" %%i in (a.txt) do (
rem 设置变量a为每行内容
set a=%%i
rem 如果该行有123，则将其改为456
set "a=!a:123=456!"
rem 把修改后的全部行存入$
echo !a!>>$)
rem 用$的内容替换原来a.txt内容
move $ a.txt

出处： https://blog.csdn.net/everdayPHP/article/details/78919020

===============================================================

查找固定的内容并替换的为固定文本的情况：

文件A.txt是需要替换的文件，运行下面这个批处理：

@echo off&setlocal EnableDelayedExpansion
for /f "delims=" %%b in ('type A.txt') do (
set "str=%%b"&set "str=!baistr:ABC=123!"&set "str=!str:XYZ=AFK!"
echo !str! >>new_A.txt
start new_A.txt

下面这个是不去空行的，有必要你就用吧，有点长！你复制过去删除多余空格，不行留邮箱发给你。百度老是存在这个问题，贴出来再复制回去格式就不一样了。真气人！！！

@echo off&setlocal EnableDelayedExpansion
for /f "delims=" %%a in ('findstr /n .* A.txt') do (
set "str=%%a"
set "str=!str:ABC=123!"
set "str=!str:XYZ=AFK!"
echo !str:~1! >>tmp.txt
for /f "delims=" %%b in ('type tmp.txt') do (
set "str=%%b"
if "!str!"==": " (
call echo. >>new_A.txt
) else (
echo !str:~1! >>new_A.txt
del tmp.txt&start new_A.txt

出处： https://zhidao.baidu.com/question/84256975.html

=============================================================

根据上面的参考，自己稍微修改点，可以适用于自己的需求的程序

自己联系和测试程序

rem 定义变量延迟环境，关闭回显 
@echo off
setlocal enabledelayedexpansion 
::goto :aa
::goto :bb2
goto :cc
rem 读取a.txt所有内容 
for /f "eol=* tokens=*" %%i in ('type test.txt') do ( 
rem 设置变量a为每行内容 
set a=%%i
rem 如果该行有123，则将其改为456 
echo !a!--
set "a=!a:dd*=456!"
rem 把修改后的全部行存入$ 
echo !a!>>$)
rem 用$的内容替换原来a.txt内容 
move $ test.txt
goto :eof
for %%i in (test.txt) do set file=%%~fi
echo ==========
for /f "delims=" %%i in ('type test.txt') do (
set str=%%i
set "str=!str:dd=456!"
echo !str!>>$
move $ test.txt
goto :eof
set old=
for /f "delims=" %%a in ('findstr .* test.txt') do (
set "str=%%a"
set "str=!str:ABC=123!"
set "str=!str:XYZ=AFK!"
echo !str!
goto :eof
set old=
rem 查找并匹配最后一行，包含king的字符串
for /f "eol=*" %%a in ('findstr /b "king" test.txt') do (set "old=%%a")
echo %old%===============
rem 再次查找完全陪陪的行，并替换queen的字符串
for /f "delims=" %%b in ('type test.txt') do (
set "str=%%b"
if "!str!"=="%old%" (set str=queen[00-11-22])
echo !str!>>$
move $ test.txt
goto :eof
set aa=kjk  dfdasf jlksj ij hgn my name AA
set bb=my
echo.%aa% | findstr /C:"%bb%"
goto :eof