You can parse dates like this:
from dateutil.parser import parse
d = parse("2015-01-13T16:12:04.000Z")
Now d is a datetime.datetime(2015, 1, 13, 16, 12, 4, tzinfo=tzutc()). This can be printed like
import datetime
print("{d.month}/{d.day}/{d.year}".format(d=datetime.datetime.now()))
strptime, not a regular expression.