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automate-the-boring-stuff-with-python's Issues

What does ' ?= ' do?

          `passwordRegex = re.compile(r'''(
^(?=.*[A-Z].*[A-Z])                # at least two capital letters
(?=.*[!@#$&*])                     # at least one of these special characters
(?=.*[0-9].*[0-9])                 # at least two numeric digits
(?=.*[a-z].*[a-z].*[a-z])          # at least three lower case letters
.{10,}                              # at least 10 total digits
$
)''', re.VERBOSE)`

What does ' ?=' do?
and shouldn't ' . ' dot and asterisk be used after [A-Z], [a-z] etc. Thank you.

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