Python and regex where is the error?

Question

Python

data = re.findall(r'[A-Z]([a-z])[A-Z]', 'aaaaBBzDDvSbG')

According to my idea, all small letters that are surrounded by large ones (''zvb") should be collected, if the pattern intersects with another pattern, then the letter is skipped, this should not happen. I don’t understand how to make it work with intersections, tell me the code and if you can advise something on regular expressions, I just can't understand them.

Answer 1

data = re.findall(r'(?<=[AZ])([az])[AZ]', 'aaaaBBzDDvSbG')