$re = '/^"\d+\/\d+\/\d+\s+\d+:\d+:\d+\s+-\s+(?<name>[^\(]+)\s+\(/m';
$str = '"18/10/2018 03:44:35 - Joneil Englis (Additional comments) Hi All, this is now being investigated. We\'ll keep you updated on our progress. 16/10/2018 04:40:51 - David Jinn Hong Chia (Additional comments) Hi team Another Shipment Cost Document has the same issue in E1P today. 563638 15/10/2018 02:21:06 - Christian Espinosa (Additional comments) Hi All, this is now being investigated. We\'ll keep you updated on our progress. "';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php