regex_matches.py

>>> pattern = re.compile(r'\w+')
>>> pattern.findall('This is a test')
['This', 'is', 'a', 'test']
>>> pattern = re.compile(r'(\w+)')
>>> pattern.findall('This is a test')
['This', 'is', 'a', 'test']


>>> pattern = re.compile(r'\W+')
>>> pattern.split("This is a test")
['This', 'is', 'a', 'test']
>>> pattern = re.compile(r'(\W+)')
>>> pattern.split("This is a test")
['This', ' ', 'is', ' ', 'a', ' ', 'test']

>>> pattern = re.compile(r'(\w+)')
>>> pattern.search('This is a test')
<_sre.SRE_Match object at 0x104cf2cd8>

=====================================================

>>> re.search(r'\w+', "this is a test")
<_sre.SRE_Match object at 0x104cf71d0>
>>> re.findall(r'\w+', "this is a test")
['this', 'is', 'a', 'test']
>>> re.split(r'\W+', "this is a test")
['this', 'is', 'a', 'test']
>>> re.split(r'(\W+)', "this is a test")
['this', ' ', 'is', ' ', 'a', ' ', 'test']
>>> re.sub(r'[0-9]+','===','this is a number test 44 66 . will it work')
'this is a number test === === . will it work'

=======================================================
>>> matchobj=re.search(r'(\w+) (\w+)',"hello world. This is test")
>>> matchobj.group()
'hello world'
>>> matchobj.group(1)
'hello'
>>> matchobj.group(2)
'world'

>>> matchobj=re.search(r'(?P<first>\w+) (?P<second>\w+)',"hello world. This is test")
>>> matchobj.groups()
('hello', 'world')
>>> matchobj.group()
'hello world'
>>> matchobj.group('first')
'hello'

>>> matchobj.groupdict()
{'second': 'world', 'first': 'hello'}

=====================================================
>>> matchobj=re.search(r'\w+ (\w+)',"hello world. This is test")
>>> matchobj.group()
'hello world'
>>> matchobj.start(1)
6
>>> matchobj.start()
0
>>> matchobj.start(2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: no such group
>>> matchobj.span()
(0, 11)
>>> matchobj.span(1)
(6, 11)

===================================
>>> itrobj=re.finditer(r'\w+ (\w+)',"hello world. This is test")
>>> m1=itrobj.__next__()
>>> m1.group()
'hello world'
>>> m1.group(1)
'world'
>>> m1.group(2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: no such group
>>> m2=itrobj.__next__()
>>> m2.group()
'This is'
>>> m2.group(1)
'is'
>>> m2.group(2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: no such group
>>> m3=itrobj.__next__()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration
>>>