$re = '/^(?!.*(?:[0-9]{4,5}\.FU|[0-9]{4,5}\.NG|[0-9]{4,5}\.SP|[0-9]{4,5}\.T|JGB[A-Z][0-9]|JNI[A-Z][0-9]|JN4F[A-Z][0-9]|JNM[A-Z][0-9]|JTI[A-Z][0-9]|JTM[A-Z][0-9]|NIY[A-Z][0-9]|SSI[A-Z][0-9]|JNI[A-Z][0-9]-[A-Z][0-9]|JTI[A-Z][0-9]-[A-Z][0-9]|[0-9]{4,5}\.HK|HSI[A-Z][0-9]|HMH[A-Z][0-9]|HCEI[A-Z][0-9]|HCEI[A-Z][0-9]-[A-Z][0-9]|\.SI|SFC[A-Z][0-9])).+/m';
$str = 'HSIT9
8411.ABC
8411.T
HCEIU-A9
8345.SI';
preg_match_all($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