powershell "(select-string 'a.txt' -pattern '>楼主：?<' –context 1).Context.PostContext" >a11.txt
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powershell "(select-string 'a.txt' -pattern '>楼主：?<' –context 1  -Encoding default ).Context.PostContext" >a_#.txt
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select-string : 找不到路径“C:\Windows\System32\WindowsPowerShell\v1.0\a.txt”，因为该路径不存在。
所在位置 行:1 字符: 2
+ (select-string 'a.txt' -pattern '>楼主：?<' –context 1).Context.PostCont ...
+  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (C:\Windows\Syst...hell\v1.0\a.txt:String) [Select-String], ItemNotFound 
   Exception
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.SelectStringCommand
 
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“C:\Windows\System32\WindowsPowerShell\v1.0\a.txt”
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powershell "(select-string 'a.txt' -pattern '>楼主：?<' –context 1).Context.PostContext" >a11.txt
powershell "(select-string 'a.txt' -pattern '>楼主：?<' –context 1  -Encoding default ).Context.PostContext" >a_#.txt
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select-string -Lit 'e:\[文本处理] 提文求助：取\a1.txt'   ......  
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powershell "(select-string  -Lit '%~dp0a.txt' -pattern '>楼主：?<' –context 1 ).Context.PostContext" >a_a.txt
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powershell "(select-string -Lit '%~dp0a1.txt' -pattern '>楼主：?<' –context 1 -Encoding default).Context.PostContext" >a_1.txt
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@echo off
set n=0
setlocal enabledelayedexpansion
(for /f "delims=" %%i in (33.txt) do (
    if !n! equ 1 echo,%%i
    set "str=%%i"
    if not "!str:>楼主=!"=="!str!" (set n=1) else set n=0
))>44.txt
pause
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grep -P -A1 --no-group-separator ">楼主(：)?<" a.txt | grep -P -v ">楼主(：)?<" | find /v "" > b.txt
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