I have implemented a set of mitigations that, together, seem to mitigate this (still ongoing) attack. If you notice any odd behavior, please do reach out to me, as I don't want any legitimate users to be negatively impacted by this change.

@regex101 Couple of days back clicking on a regex101 saved link redirected to the home page. I was alarmed but a few minutes later it worked fine. Thank you for an incredibly useful, simple, and clever system. :-)