Using half a dozen Doctor Who Series's I selected 880 files then pressed "E" and selected the "Search and Replace" tab. Changed to "Character Match".
Selected "#genre", entered "Search For:" as "Adult Fiction" and "Replace with:" as "SciFi" and I got what is displayed in the attachment.
I tried several times. I tried naming the search and replace. I came out of Calibre and in again. All sorts....
Thank God I didn't press "Okay" as it would have ruined the field on the 880 books.
I tried the "Test Text" and that was fine (not in attachment)
What am I doing wrong?
I have noticed something like this a few times before but it seemed to come good.