How to get all overlapping matches in python regex that may start at the same location in a string?

How do I get all possible overlapping matches in a string in Python with multiple starting and ending points.

I’ve tried using regex module, instead of default re module to introduce overlapped = True argument, but still it is missing some matches.

Trying to describe my problem via a simpler illustration:

Find all possible combinations in the string (axaybzb) starting with a and ending with b

Tried following codes:

import regex

print(regex.findall(r'a\w+b','axaybzb', overlapped=False))

['axaybzb']

print(regex.findall(r'a\w+?b','axaybzb', overlapped=False))

['axayb']

print(regex.findall(r'a\w+b','axaybzb', overlapped=True))

['axaybzb', 'aybzb']

print(regex.findall(r'a\w+?b','axaybzb', overlapped=True))

['axayb', 'ayb']

Expected output to be

['axayb', 'axaybzb', 'ayb', 'aybzb']