Yoast highligh custom search result

Maybe someone in the WordPress community can help me with this.

I am using Genesis with WordPress and I have created some functions with the help from others on the internet to make custom search results in WordPress. With these functions the search results have the Meta title and description from the Yoast SEO plug-in.

I also made a function to hightlight the keywords that somebody used in the searchresults but it only is applying to the title and not to the excerpt that is created with the Yoast Meta description.

This is the function for hightlight the keywords in the results:

I already tried to use this filter to make the highlight work in the excerpt:

But that did not work either.

This are the functions I found to use Yoast in the search results:

How can I also highlight the excerpt of the search results in this function? If someone has an idea that would be great.