variables - Extract line below Findstr criteria in Batch file for cycle -

i'm trying extract set of txt files line placed 2 rows below 1 matching search criteria , redirect output csv file.

i managed specific txt file in set, i'm getting troubles in writing cycle batch-scan each txt in given folder.

through this, wrote following code scan a specific file. works fine:

setlocal enabledelayedexpansion cd "myfolder" if exist myoutput.csv del myoutput.csv  /f "delims=:" %%a in ('findstr /b /n /c:"mycriteria" "myfile.txt"') ( set /a linebelow=%%a+2 set "linebelow=!linebelow!: " ) (for /f "tokens=1* delims=:" %%a in ('findstr /n "^" "myfile.txt" ^| findstr /b "%linebelow%"') ^ echo %%b>>myoutput.csv)  start myoutput.csv  endlocal 

when tried generalize code in cycle scan each txt in myfolder got error in findstr: !linebelow! happens empty variable...

here's flawed cycle:

setlocal enabledelayedexpansion cd "myfolder" if exist myoutput.csv del myoutput.csv  %%f in ("*.txt") ( ( /f "delims=:" %%a in ('findstr /b /n /c:"mycriteria" "%%f"') ( set /a linebelow=%%a+2 set "linebelow=!linebelow!: " )) (for /f "tokens=1* delims=:" %%a in ('findstr /n "^" "%%f" ^| findstr /b "!linebelow!"') ^ echo %%b>>myoutput.csv))  start myoutput.csv  endlocal 

could me in correcting code? thanks

@echo off     setlocal enableextensions enabledelayedexpansion      cd "myfolder"      > myoutput.csv (         /f "tokens=1,2 delims=:" %%a in ('             findstr  /b /n /c:"mycriteria" *.txt         ') (             set /a "line=%%b+2"             /f "tokens=1,* delims=:" %%c in ('                 findstr /n "^" "%%a" ^| findstr /b /c:"!line!:" 2^>nul             ') echo(%%d         )     ) 

this uses findstr directly enumerate lines matching mycriteria , include in output name of file (%%a) , number of line (%%b). information used retrieve final line (%%d) matching files.