how to write a batch file which can identify value from a text file and store that value in some other text file -

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i have text file have number content , string content,i want write batch can identify number content , store number content each line in other text file.

this example work integer numbers between spaces.

special caution must put in text file, behaviour ", <, |, > , & may unpredictable.

some optimizations may made having more information text file.

for /f "tokens=*" %%i in (textfile.txt) call :getnumber %%i goto :eof  :getnumber if "%~1"=="" goto :eof set number= set /a "number=1*%~1" if "%number%" == "%~1" call :storenumber %number% shift goto :getnumber  :storenumber echo %number%>number.txt

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