- Select all the books you wish to affect, and open Bulk Metadata Edit. Make sure you are using regex mode.
- Search for...
Code:
Search field: identifiers
Identifier type: isbn
Search for: (.*)
Replace with: \1
Destination field: <anything you can spare. I used "comments">
Apply the edit.
- Search for...
Code:
Search field: comments
Search for: (.*)
Replace with: isbn:\1
Destination field: identifiers
Identifier type: *
Apply the edit.
The reason this works is because, while there is no way to replace an identifier with a subset of itself, you can use * to replace all the identifiers IF AND ONLY IF the search field is
not "identifiers". So by temporarily storing the isbn in another field, you can have the isbn overwrite the whole identifiers field.
(I used the comments field, because I used a test book created by importing another book from the same library.
)
See screenshots.