What is the meaning of "Empty matches are included in the result."?

Question

I am referring to the documentation of the re.findall function:

What is the meaning of "Empty matches are included in the result."?

Answer 1

This happen when you use groups that matches empty string , example:

 print(re.findall(r'(\w)(\d?)(\w)', "bc"))

OUPUT:

[('b', '', 'c')]

Here group (\d?) matches '' and is included in the result.