$re = '/^
(?:
(?:(?=\D*\d)(?=[^a-z]*[a-z]))
|
(?:(?=\D*\d)(?=[^!?€%&]*[!?€%&]))
|
(?:(?=\D*\d)(?=[^A-Z]*[A-Z]))
|
(?:(?=[^a-z]*[a-z])(?=[^!?€%&]*[!?€%&]))
|
(?:(?=[^a-z]*[a-z])(?=[^A-Z]*[A-Z]))
|
(?:(?=[^!?€%&]*[!?€%&])(?=[^A-Z]*[A-Z]))
)
.+
$/mx';
$str = '
1 digit
1 lowercase character
1 special character (!?€%&, etc)
1 uppercase character
1A';
preg_match_all($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