Online PHP editor | refs for UkX38

<?php $strings = [ 'attachment;filename="unnamed.jpg";filename*=UTF-8\'\'unnamed.jpg\'', 'attachment;filename="unnamed.jpg"', 'attachment;filename=unnamed.jpg;filename*=UTF-8\'\'unnamed.jpg\'', 'attachment;filename=unnamed.jpg' ]; foreach ($strings as $string) { preg_match('/^.*?filename="?\K[^";]+/m', $string, $matches); print_r($matches); }