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Grep for valid ip address
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| grep -oE "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" file.txt | |
| # for 0.0.0.0 to 999.999.999.999 | |
| # grep -oE "([0-9]{1,3}[\.]){3}[0-9]{1,3}" |
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