How do I access classes and get a dir() of available actions?

In Python 3.7, re.Match is the type of the objects returned by re.match. See bpo30397.

In previous versions, re.Match is not defined. If you wanted a reference to the type of match objects you could get it with

Match = type(re.match('',''))

You can use dir on either the Match type or on a match object to list its attributes and methods.