$re = '/jdbc:postgresql:(?=.)(?:(?:/$)|//(?:(?<user>[^:\n\r]+)(?::(?<pass>[^@\n\r]+))@)?(?<host>[^:/\r\n]+)(?::(?<port>\d+))?/)?(?<db>.+)?/m';
$str = 'jdbc:postgresql:database
jdbc:postgresql:/
jdbc:postgresql://host/database
jdbc:postgresql://user:password@host/database
jdbc:postgresql://host/
jdbc:postgresql://host:1234/database
jdbc:postgresql://host:1234/';
preg_match_all($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