strip liquid image preserve tag

snippet.liquid

If the alt tag is empty...
{% if product.metafields.custom_fields["test_background_image"] contains 'alt=""' %}
  {% assign image_url = product.metafields.custom_fields["test_background_image"] | remove: '<img src="' | remove: '" alt="" typeof="foaf:Image" />' %}
  Image URL: {{ image_url }}
{% else %}
  If the alt tag has a value...
  {% assign v1 = product.metafields.custom_fields["test_background_image"] | remove: '<img alt="' | split: '" src="'%}
  {% assign alt = v1[0] %}
  {% assign image_url = v1[1] | remove: '" typeof="foaf:Image" />'%}
  Image URL: {{ image_url }}
  Alt Tag: {{ alt }}
{% endif %}