php - How can I show only tags in The Loop?

Is there a way to force The Loop to show only

tags from the content of a post, while ignoring all other tags (h2, p, hr... )?

  

    $hm_intro = new WP_query(array(
  'p' => 375,
  'post_type' => 'any',
  'posts_per_page' => 1
  ));
  if($hm_intro->have_posts()) : while($hm_intro->have_posts()) : $hm_intro->the_post();

  //Here I want display only the 
 from the_content().

  endwhile;
  wp_reset_postdata();
  endif;
  ?>
  

Answer

You can parse all the H1s out of the post content with domDocument:

if($hm_intro->have_posts()) : while($hm_intro->have_posts()) : $hm_intro->the_post();

    $dom = new domDocument;
    $dom->loadHTML(get_the_content());

    $headings = $dom->getElementsByTagName('h1');

    foreach ($heading as $h){
        echo '
' . $h->textContent . '
';
    }

endwhile;