shopify blog show first available image if no featured image

shopify image blog first available

{% if article.image.size > 0 %}
    # show featured image
{% else %}
    {% if article.content contains "<img" %}
    {% assign src = article.content | split: 'src="' %}
    {% assign src = src[1] | split: '"' | first %}
    <img src="{{ src }}" alt="{{ article.title }}">
    {% endif %}
{% endif %}