Regular expression to return all keys in a Bibtex file

A Bibtex file is a structured file (I have shown an example of two records at the end).

I would like to extract the 'keys', which is the text between an '@' and a comma but only get the text AFTER the '{'

So, in the line

@Article{m2023a,

it would return 'm2023a'

.. failing that, I could just get all those lines and then do another regex to further refine.

The best I have come up with so far is:

/@([^,]*)\,/

but I can't help feeling that there is a better way, and even this is not quite right.


An example of a Bibtex file is (this is two records, there could be hundreds):

@Article{m2023a,
  author  = {S. Macdonald},
  journal = {Social Science Information},
  title   = {The gaming of citation and authorship in academic journals: a warning from medicine},
  year    = {2023},
  doi     = {10.1177/05390184221142218},
  issue   = {In Press},
}

@Misc{b2017a,
  author  = {S. Buranyi},
  title   = {Is the staggeringly profitable business of scientific publishing bad for science?},
  year    = {2017},
  journal = {The Guardian, 27 June 2017},
  url     = {https://www.theguardian.com/science/2017/jun/27/profitable-business-scientific-publishing-bad-for-science},
}