re.compile

详情见

>>> import re
>>> s = "adfad asdfasdf asdfas asdfawef asd adsfas "

>>> reObj1 = re.compile('((w+)s+w+)')
>>> reObj1.findall(s)
[('adfad asdfasdf', 'adfad'), ('asdfas asdfawef', 'asdfas'), ('asd adsfas', 'asd')]

>>> reObj2 = re.compile('(w+)s+w+')
>>> reObj2.findall(s)
['adfad', 'asdfas', 'asd']

>>> reObj3 = re.compile('w+s+w+')
>>> reObj3.findall(s)
['adfad asdfasdf', 'asdfas asdfawef', 'asd adsfas']