Confused about auto adding tags

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This is a question about the free plugin as still investigating if it will do what I want.
I have a site about cooking with Thermomix and some of the posts will have videos in them.
I want to add the tag: Thermomix videos

to all posts that have Youtube or Vimeo videos embedded in them.
Reading your documentation and blog post it seems that the tag to be added has to match the content – eg it will find Youtube to add Youtube as a tag.
What I am after is the ability to enter a search term and match that with a tag to be added to the post:

Youtube = Thermomix videos
Vimeo = Thermomix videos

so the text being searched for does not match the tag to be added.
I cannot find anywhere to enter the search term and an accompanying tag.
Is this possible with the free plugin? Do I need Pro or the plugin can’t do this at all yet?

Thanks,
Dale.

 

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