Not sure if this is a bug or not, but it looks like google is finding some weird dead links to crawl in the portal. I came across this on a google search:
Here's the link: https://nf.synapse.org/Explore/10.1212/WNL.0000000000002927
(10.1212/WNL.0000000000002927 is a Publication DOI of one of the publciations on the portal, so I'm guessing that has something to do with it).
Anyway, not clear to me if this is just a one off weirdness, or if this is systematic across the NF Portal or across all portals, but wanted to mention it while I saw it.
The issue is that the DOI "10.1212/WNL.0000000000002927" isn't getting matched by our DOI regular expression. As a result its not getting the right hyperlink format and instead appending to the portal url. I'll have to find a better regular expression!
Fixed our DOI regex, it wasn't ignoring case before. Can validate here -
Looks good to me, thanks for the fix !