$re = '/ (?(DEFINE)
(?<unreserved> [-._~[:alnum:]] )
(?<sub_delims> [!$&\'()*+,;=] )
(?<pct_encoded> %[[:xdigit:]][[:xdigit:]] )
(?<pchar> @|(?&unreserved)|(?&pct_encoded)|(?&sub_delims) )
(?<seg_nz_nc> (?&pchar)+ )
(?<seg_nz> (?::|(?&pchar))+ )
(?<seg> (?::|(?&pchar))* )
(?<rootless> (?&seg_nz)(?:\/(?&seg))* )
(?<noscheme> (?&seg_nz_nc)(?:\/(?&seg)*) )
(?<absolute> \/(?:(?&seg_nz)(?:\/(?&seg))*)? )
(?<abempty> (?:\/(?&seg))* )
)
^(?:(?&rootless)|(?&noscheme)|(?&absolute)|(?&abempty))$
/ix';
$str = '/bla/asd/f.fasdf';
preg_match_all($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