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没大看懂 发个保留空行的

@echo off
set filename="1.txt"
for /f "delims=0123456789" %%a in ('findstr /n .* %filename%') do (
    set "s=%%a"
    setlocal enabledelayedexpansion
    echo;!s:~1!
    if /i "!s:~1!" == "rem var1" (
       echo;rem var1
    ) else if /i "!s:~1!" == "rem var2" (
       echo;rem var2
    )
    endlocal
)
pauseCOPY