@chriso -- proposing this revert on #1167 as a stop-gap measure for now; since quite a number of users have been affected with the 13.1.0 release. If this okay, you can merge; as we wait for @MladenZeljic to send in a fix.

Apologies, this was an oversight from my end.

13.1.1 is now available. Thanks for determining the issue so quickly and submitting a patch.

Apologies, this was an oversight from my end.

No probs! I had no idea about the lookbehind incompatibility either. It'd be great to somehow test the browser version against various browsers/platforms, but not sure how feasible that is with the current CI setup.

We're discussing with @tux-tn about the easiest way we could add some form of browser tests. #1354 (comment)

I noticed that the same commit was regressing on Node v6.17.1, so I'm adding this version on the list of our builds for the time being. This could act as a proxy for old/not-so-progressive browsers.