re module

group

Returns group by the number.

m = re.match(r"(\w+).(\d+)", "www.222") 
 
m.group(1) # 'www'
m.group(2) # '222'

groups

Returns a tuple of groups found.

m = re.match(r"(\w+).(\d+)", "www.222") # gives matches
m.groups() # ('www', '222')

groupdict

Returns a dictionary of named groups.

m = re.match(r"(?P<words>\w+).(?P<numbers>\d+)", "www.222") 
m.groupdict()
# {'word': 'www', 'number': '222'}