Html Tag set classes

Hello,

i convert my page to other static generator which understand not liquid
template language and i can not convert in ruby template language. So 
i ask me i can fix my problem maybe with sed. 

Seeking a way to a particular term inside the head of a article (webpage)
and then in footer want set active to class. It goes with tags and years. 

For example in head, the tag is example together have five tags. 

<span class="time">02.05.2015</span>
<span class="tags"><a href="/blog/tags/society/">society</a>

In  Header should search year and tag. 

Then in footer stand...

<aside class="blog">
<ul>
    <li><a href="/blog/tag/computer/">computer (3)</a></li>
    <li><a href="/blog/tag/society/">society (11)</a></li>
    <li><a href="/blog/tag/state/">state (10)</a></li>
    <li><a href="/blog/tag/media/">media (3)</a></li>
    <li><a href="/blog/tag/network/">network (2)</a></li>
</ul>
 
<ul>
    <li><a href="/blog/2015/">2015 (7)</a></li>
    <li><a href="/blog/2014/">2014 (14)</a></li>
    <li><a href="/blog/2013/">2013 (4)</a></li>
    <li><a href="/blog/2012/">2012 (4)</a></li>
</ul>
</aside>

This is footer should then set class="active" when year and tag is matched. 

Has someone an idea? This should work recursive, because middleman want me 
not set this chance and my coding expierence is limited. 

Thank You & Nice Day
----------------
Silvio Siefke


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