[文本处理] 批处理如何提取文本中指定字符串所在行及其前两行和后两行

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in (a.txt) do (
     set /a n+=1&set "_!n!=%%a"
     if "%%a" equ "qwe      0" set "flag=a"
     if defined flag set /a m+=1
     if "!m!" equ "3" goto next
)
:next
set /a v=n-4
for /l %%a in (%v%,1,%n%) do echo !_%%a!
pause>nul
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