Python 正则表达式 re.match与re.search

#!/usr/bin/python
# # -*- coding: UTF-8 -*-

import re

str = "hazy is very happy"

m = re.match(r'(.*) is (.*?) .*',str,re.M|re.I)
s = re.search(r'(.*) is (.*?) .*',str,re.M|re.I)

if m:
    print("测试 ",m.group())
    print("测试 1", m.group(1))
    print("测试 2", m.group(2))
else:
    print("空")

if s:
    print("测试 ",s.group())
    print("测试 1", s.group(1))
    print("测试 2", s.group(2))
else:
    print("空")

#re.match与re.search的区别
ms = re.match( r'happy', str, re.M|re.I)
if ms:
   print ("match --> ms.group() : ", ms.group())
else:
   print ("No match!!")

ms = re.search( r'happy', str, re.M|re.I)
if ms:
   print ("search --> ms.group() : ", ms.group())
else:
   print ("No match!!")

re.match只匹配字符串的开始，如果字符串开始不符合正则表达式，则匹配失败，函数返回None；而re.search匹配整个字符串，直到找到一个匹配。