How do you extract IP addresses from files using a regex in a linux shell?

Question

How to extract a text part by regexp in linux shell? Lets say, I have a file where in every line is an IP address, but on a different position. What is the simplest way to e

Answer 1

You could use awk, as well. Something like ...

awk '{i=1; if (NF > 0) do {if ($i ~ /regexp/) print $i; i++;} while (i <= NF);}' file

May require cleaning. just a quick and dirty response to shows basically how to do it with awk.