Two notes.

One, Python's re engine is not nearly as capable as Perl's. I've only written a tiny amount of Python, but I've already hit its limitations repeatedly. Enough so that I now go straight to Python's regex engine. This one is much closer to Perl's.

Two, Perl's regex engine is famously good at failing fast (i.e. detecting that a pattern can't match). I've always heard of it coming out slower in comparisons otherwise.