正則表達式匹配與查找

import re

datepat = re.compile(r'(\d+)/(\d+)/(\d+)')

m = datepat.match('11/27/2012')

print(m)

print(m.group(0))

print(m.group(1))

print(m.group(2))

print(m.group(3))

print(m.groups())

month, day, year = m.groups()

text = 'Today is 11/27/2012. PyCon starts 3/13/2013.'

datepat.findall(text)

for month, day, year in datepat.findall(text):

    print('{}-{}-{}'.format(year, month, day))

輸出：

<_sre.SRE_Match object; span=(0, 10), match='11/27/2012'>

11/27/2012

11

27

2012

('11', '27', '2012')

2012-11-27

2013-3-13

  

text = '@$python@$python'

m = re.search(r"\w+", text)

if m: 

    print(m.group(0))  #python

else:

    print('not match')

def test_findall_search():  

    str1 = '456abc789abc8910abc'  

  

    re_str = re.compile(r'\d+')  

    re_findall = re_str.findall(str1)  

  

    print(re_findall)    #['456','789','8910'] 

    re_search = re_str.search(str1)  

    print(re_search)    #<_sre.SRE_Match object; span=(0, 3), match='456'>

    print(re_search.group(0))   #456

test_findall_search()