Bugfix/article ID parsing issue

[KevinZonda]

Refer to gijswobben/pymed#30

[jannisborn]

Hi @KevinZonda,
Thanks for your interest and this PR. You need to provide a bit more context here, ideally a test or MWE that fails with the old version and works with your fix. E.g., you're pointing to gijswobben/pymed#30 which updates article.py but your change is in book.py. When testing your code with the original query from the example, nothing changes, so I dont see any reason to merge the PR as is.

Also gijswobben/pymed#31 provides an alternative solution to the original issue (gijswobben/pymed#22) and we need to understand which is better.

We can fix the original issue in this library, but if we do it, we do it once and in a clean way. Thanks for your support!

[jannisborn]

See above comment

[jannisborn]

@KevinZonda I opened #7 to fix the issue you mention by changing article.py (rather than book.py). Let me know if you have any thoughts on this, otherwise #7 will be merged soon instead of this PR.
Thx for raising this issue

[jannisborn]

Superseded by #7