Application error: a client-side exception has occurred on official React.dev site

[emthaa]

When accessing react.dev website on iPhone SE and multiple different browsers it loads the website for a split second then this message pops up:

[itsjohncs]

I can reproduce this on Safari Desktop 16.0 with extensions disabled. In the console I get a regex error (see below) and links to error codes 418 and 423.

The regex error is SyntaxError: Invalid regular expression: invalid group specifier name. Looking at the traceback leads me to the regex (in the minified code): ((?<!\\+)https?:\\/\\/(?:www\\.)?(?:[-\\w.]+?[.@][a-zA-Z\\d]{2,}|localhost)(?:[-\\w.:%+~#*$!?&/=@]*?(?:,(?!\\s))*?)*)

[vvtommy]

lookbehind is only supported on Safari(and wkwebview of course) 16.4(ios 16.4) and above. 🤷🏻‍♂️

[rickhanlonii]

Thanks for reporting, this was broken last week with #6214

Fixed in #6571

[rickhanlonii]

Confirmed that the fix is live, thanks again!