$re = '/^(?:(?<scheme>[^:\/?#\n]+):(?=\D))?(?:(?:\/\/)?(?:(?:(?<user>[^:\n]*)(?::(?<pass>[^@\n]*))?@)?(?:(?<=.)(?<host>[^[\/:?#\n]+|\[[^]\n]+])(?::(?<port>[^\/:?#\n]+)?)?|(?<host2>(?&host)):(?<port2>(?&port)))|(?<=\/\/)\/)?)?(?<path>[^?#\n]*)(?<query>\?[^#\n]*)?(?<fragment>#.*)?$/im';
$str = 'http://user:pass@test.com:8080/example?query#anchor
localhost:8001/test
file:///C:/temp/file.txt
//host:2/path
http://www.foo.com#
scheme:path
ssh://git@github.com';
preg_match_all($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