re.S、 re.M

re.S是代表.可以匹配\n以及“  re.M是多行

 

code

import re
a = '''asdfsafhellopass:
    234455
    worldafdsf
    '''
b = re.findall('hello(.*?)world',a)
c = re.findall('hello(.*?)world',a,re.S | re.M)
print 'b is ' , b
print 'c is ' , c

打印结果

b is []
c is ['pass:\n 234455"\n aaa\n aawaw\n ']