$matches = array();
$log = file_get_contents('your-text-file');
$match = preg_match_all("/[a-z0-9!_{|}~-]+(?:\.[a-z0-9?^_{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/", $log, $matches, PREG_PATTERN_ORDER);
file_put_contents('out.csv', implode(PHP_EOL, array_unique($matches[0])));
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