in reply to Retrieve an email address of sysadmin only knowing the IP address

Very quick and dirty, assuming your output is in $string and an email address is everything not whitespacey around an @: 

if (/(\S+@\S+)/} {
  $email = $1;
}

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If the output format is always the same and the email is always at the same position then you can get more precise ...

-- Hofmator

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