grep for ip address code example

Example 1: grep ip address

grep -oE "\b([0-9]{1,3}\.){3}([0-9]{1,3})\b" $file

Example 2: ip address regex validate cmd

echo off
:start
cls

set /p localWireless=input wireless ip address ? &
echo %localWireless% | findstr /i /r [0-9].*.[.].*.[0-9].*.[.].*.[0-9]

if %errorlevel% equ 0  (
  goto installLocalWireless
) else (
  msg %username% 'ip address is not valid'
  goto start
)

:installLocalWireless
cls
echo Hello Wordl
pause
goto start