[文本处理] 批处理如何删除文本中指定内容，但每行开头的字符需保留

$arr = (type 1.txt -ReadCount 0) -replace '(?!^)\[一生 ]'; sc 2.txt $arr
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@echo off
set info=互助互利,支付宝扫码头像,感谢赞助
rem 有问题,可加QQ956535081及时沟通
title %info%
start mshta VBScript:Execute("msgbox(""%info%""):close")
cd /d "%~dp0"
set "入=a.txt"
set "出=b.txt"
powershell ^
    $s='[一生 ]';^
    $t=@(gc '%入%')^|%%{$r=$_.replace($s,'');if(-join($_[0..($s.length-1)]) -eq $s){$s+$r}else{$r}};^
    [IO.File]::WriteAllLines('%出%', $t, [Text.Encoding]::Default);
pause
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sed "s/\[一生 \]//g; s/^/[一生 ]/" 1.txt > 2.txt
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