I was trying to make a second regex to account for ISBNs with spaces/dashes. Did I make a mistake with the regex or the search syntax here?
https://regex101.com/r/vJUZpu/1
Code:
identifiers:"=isbn:~\d{1}(-|\s)\d{3}(-|\s)\d{5}(-|\s)\d{1}"
(I also need to figure out how to account for the X check digit)