How to search for an empty field e.g. an entry not containing DOI

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1

Hi,
I am trying to search for a non existence of an entry. In detail, I want to filter all entries which does not contain DOI entries. Any idea how to search for this? (I already tried to do it with regex, but I think this is not purposeful as the “doi” is not in the bibtex file and not an empty entry).
Thanks!

2

Could be that there are more solutions than just these, but those are the ones that came to my mind

  • You could add the doi field to the entry table and sort by doi.
    image

  • Another solution is to use regular expression search:
    use doi!=.*

    image
    image853×35 1.35 KB

Edit:

doi denotes is the doi field
! = not
= = equals
. = any character
* = matches the preceeding character (in this case any character) zero or more times

Documentation and examples for RegEx syntax can be found in the java and jabref docs

edit2:

doi!=.+ might be better.

+ means one or more times

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3

AArgh! Thanks a lot.
The first suggested solution is so obvious, that I completely missed it :slight_smile:

The regex one is my favourite one. Thanks a lot!

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