Search for ISBN-10s

[ownedbycats]

I also figured out how to get ISBNs that use X for a check digit. It even accounts for case sensitivity.

identifiers:"=isbn:~^\d{9}(\d{1}|(X|x))$"
OR identifiers:"=isbn:~^\d{1}(-|\s)\d{3}(-|\s)\d{5}(-|\s)(\d{1}|(X|x))$"

[theducks]

Originally Posted by ownedbycats

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

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)

replace the last term with [0-9X]
FWIW \d{1} is redundant. \d is a single DIGIT

Also: Your pattern is way to tight for small presses
0-1234567-8-X is valid (check digit is incorrect )
1-2-3456789-0 is valid, and any 8 digit combination in between the language and check

[capink]

Another approach that gives you more control:

• create a stored template called isbn_count (preferences > template functions > stored templates). Use the following template:
  

  program:
  	isbn = select(field('identifiers'),'isbn');
  	isbn = re(isbn, '[^\d]', '');
  	strlen(isbn)

• You can now use the above stored template in the search bar (thanks to the newly added template search by chaley):
  

  template:"program: isbn_count()#@#:n:=10"

Note: If you want to remove leading and trailing zeros, modify the stored template as follows:

program:
	isbn = select(field('identifiers'),'isbn');
	isbn = re(isbn, '[^\d]', '');
	isbn = re(isbn, '^0', '');
	isbn = re(isbn, '0$', '');
	strlen(isbn)

This way it does not matter where the dashes appear since they are removed before counting.

Edit: For people who know python, you can replace the stored template with a custom template function.

Edit2: Add modifications suggested by chaley in the post below.

Edit3: You can skip the first step of creating a stored template, and directly use the followin search:

template:"program: strlen(re(select(field('identifiers'),'isbn'), '[^\d]', ''))#@#:n:=10"

I just think that using a stored template makes it cleaner and more readable.

[chaley]

Originally Posted by capink

program:
	isbn = select(field('identifiers'),'isbn');
	isbn = re(isbn, '[^\d]', '');
	isbn = re(isbn, '(\d)', '\1,');
	count(isbn,',')

Without going too deeply into the previous posts to see if the answer is already there, it seems that this template is equivalent to the above, but faster.

program:
	isbn = select(field('identifiers'),'isbn');
	isbn = re(isbn, '[^\d]', '');
#	isbn = re(isbn, '(\d)', '\1,');
#	count(isbn,',')
	strlen(isbn)

[capink]

Definitely better. Was not aware of the strlen function. That was I meant by replacing with python (using len() in custom template function). I will edit my post to include your modifications.