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#!/bin/bash
echo '192.168.1.1 foobar' | grep -E '([0-9]{1,3}\.?){4}'
echo '192.168.1.1 foobar' | grep '\([0-9]\{1,3\}\.\{0,1\}\)\{4\}'

Success #stdin #stdout 0s 19632KB

stdin

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Standard input is empty

stdout

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192.168.1.1 foobar
192.168.1.1 foobar

https://ideone.com/j1M0dd

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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