Как правильно настроить preg_replace для full_story?

  $row['full_story'] = preg_replace( "'text-align:right;'si", "righttt", $row['full_story'] );
  $row['full_story'] = preg_replace( "'text-align:left;'si", "lefttt", $row['full_story'] );
  $row['full_story'] = preg_replace( "'text-align:center;'si", "centerrr", $row['full_story'] );
  $row['full_story'] = preg_replace( "'<img'si", "<amp-img layout=\"responsive\" width=\"1080\" height=\"610\"", $row['full_story'] );
  $row['full_story'] = preg_replace( "'<!--dle_image_end-->'si", "</amp-img>", $row['full_story'] );
  $row['full_story'] = preg_replace( "'<iframe'si", "<amp-iframe layout=\"responsive\" sandbox=\"allow-scripts allow-same-origin allow-popups\"", $row['full_story'] );
  $row['full_story'] = preg_replace( "'</iframe>'si", "</amp-iframe>", $row['full_story'] );