Extract an image src from an article excerpt
{% comment %}
This include requires you to pass in the an article excerpt
which contains a single image.
Example: {% include 'excerpt_image' with article.excerpt %}
{% endcomment %}
{% assign src = excerpt_image | split: 'src="' %}
{% assign src = src[1] | split: '"' %}
{% assign src = src[0] %}
{{ src }}