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 $variabile =~ m/\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b/

Con Grep sembra non andare

==Riferimenti==
*[http://www.regular-expressions.info/examples.html Regular Expression Examples]

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