i need to get just the id from a youtube link using an oembed field from advanced custom fields

videolink id

<?php
  $vf = get_sub_field( 'videolink' );
  preg_match('/src="(.+?)"/', $vf, $matches);
  $vf = end(explode('/', reset(explode('?', $matches[1]))));
?>
<?php if($vf): ?>
  <a class="button button__play js-modal-btn" href="#" data-video-id="<?php echo $vf; ?>">Watch</a>
<? endif; ?>