[gurcha]

OK, i have messed up my library pretty badly and need some help please.

I had used both import list and jobspy before to upload metadata from a csv to a custom field so thought I could plough ahead without a backup of my library.

However, it seems that while this is a fairly easy process for custom fields, it is not so easy for standard, in-built, fields like Identifiers.

I created a catalog with my ID's so I could work on them outside of calibre, but now I am ready to re-import them, i am stuck.

Import list plugin is a no go as it only works with custom fields.

Jobspy says it can do it, but i spent half a day getting my csv into what i believe is the correct format - 'type':'value' separated by commas, but I cannot get it to work.

I have now imported the ID's to a custom field - #identifierimport - and looking for a way to simply copy the data from this field into the identifier field verbatim.

This can be achieved one by one without any problem, but can someone please either tell me how to do this for my entire library or write a REGEX that accomplishes this in the search and replace function.

To clarify, I simply want to copy the exact data from a custom column to the Identifier field. I have over 10,000 books and can't face going one by one.

Thanks for any help provided.