$re = '~motive="(.+?)" res="(\d+/\d+)/(\d+)"~m';
$str = '<ok date="1578334440" motive="1.5.4. Невыплата штрафа" res="21/8000/1214657702" udo="0/0" />';
preg_match_all($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