Ugh, went back to HN to post the same comment. On FF this usually means that the regexp uses `lookbehind`: https://caniuse.com/#feat=js-regexp-lookbehind https

Ugh, went back to HN to post the same comment. On FF this usually means that the regexp uses `lookbehind`: https://caniuse.com/#feat=js-regexp-lookbehind https://caniuse.com/#feat=js-regexp-lookbehind