I had the same issue. It turns out one of the test cases is 'a #b \n c \n d $e f g', with # and $ as markers.
As you probably know, the $ symbol has a special meaning in Regex.

Thanks, that was good to know.

This is done to rule out e.g. leading 0's.
It's first turned into a number, then into a string and finally compared to the original.
String(Number("01")) is "1", which is not equal to "01".

Thanks for the explanation, I made the same mistake.

Thanks for this explanation.

Thank you.