- preg_match: documentation ( source)
<?php
$yourdata = "16:53:41.640 T#4820 PresenceManager: ᥺[NAME]0x366f7cdb9df5a0e9-s-s157.55.56.143:40018-r[IPADDRESS]:44385";
preg_match(".*?((?:(?: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]?)).", $yourdata, $matches);
echo "Ip:".$matches[0];
?>