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My understanding is that you want to process tag that are ISBNs, grab the value, and then put it into the identifiers field. This can be done with edit metadata search/replace. However ...
Assigning a 'multiple' column (tags) to a non-multiple column (isbn) can lead to unexpected behavior. Because the source field is multiple, search/replace processes each tag individually. The search & replace expressions alter the individual values before copy, then each tag value is added to the non-multiple identifier. This isn't what you want. Instead, you want the tags to be processes as a non-multiple so that the search, replace, and copy happens once per book. To do this, convert tags to a non-multiple column using the template feature, then extract the ISBN, then assign that extraction to the identifier.
See the attached screen capture.
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