I personally have run into breaking changes in Python's regex module, which is pretty fundamental to such uses as mentioned above. If I recall correctly, they

I personally have run into breaking changes in Python's regex module, which is pretty fundamental to such uses as mentioned above. If I recall correctly, they changed how `re.escape` worked between Python 3.6 and 3.8 (I'm not sure which minor change exactly) in terms of which symbols received a backslash before them, thereby breaking my code.