Shopify blog sub-menu using tags

blog.liquid

<!--
Create a sub-menu for the blog based on specific tags, grouped by a prefix. 

Example menu: "Yamaha | Suzuki | Harley-Davidson etc"
Method: Tag a blog post with "specificPrefix_Yamaha"
-->

{% assign brandedBlogTagList = '' %}

{% for blogTag in blog.all_tags %}
  {% if blogTag contains "specificPrefix_" %}
    {% assign brandedBlogTagList = brandedBlogTagList | append: ',' | append: blogTag %}
  {% endif %}
{% endfor %}

{% assign brandedBlogTagList = brandedBlogTagList | remove_first: ',' | split: ',' %}
        
{% for brand in brandedBlogTagList %}
  <a href="/blogs/blog/tagged/{{ brand | handleize }}">{{ brand | split: 'specificPrefix__' | last }}</a>
{% endfor %}