Python 正则表达式

#!/usr/bin/env python
#-*- coding:utf-8 -*-
import re

#match 从开头匹配
a = re.match("abc","abcdef")
print(a)
print(a.group())

a = re.match("abc","cabcdef")
print(a)

c = re.match("[0-9][0-9]","78d6ef")
print(c)
print(c.group())

c = re.match("[0-9]{0,10}","78d6ef")#匹配0到10次
print(c.group())

c = re.match("[0-9]{2}","7890d6ef")#匹配两次
print(c.group())

#findall 匹配所有
d = re.findall("[0-9]{1,10}","123abcde45eg")
print(d)

d = re.findall("[a-zA-Z]{1,10}","123abcde45eg")
print(d)

#匹配任意字符
e = re.findall(".*","123456abcde")
print(e)

#搜索
f = re.search("d+","75_46.5 4a~bc6@def")
print("f is {0}".format(f.group()))
 
f = re.search("^d+$","752343445")#匹配以数字开头和以数字结尾
print("f is {0}".format(f.group()))

#替换
g = re.sub("d+","|","adf75_46.5 4a~bc6@def",count=2)#将匹配的数字替换成|，替换两个，若没有count则全部替换
print('g is {0}'.format(g))

<_sre.SRE_Match object; span=(0, 3), match='abc'>
abc
None
<_sre.SRE_Match object; span=(0, 2), match='78'>
78
78
78
['123', '45']
['abcde', 'eg']
['123456abcde', '']
f is 75
f is 752343445
g is adf|_|.5 4a~bc6@def