正则表达式（python3）

#

import re

##########.的使用###############

q = 'a'

w = 'A'

e = '_'

r = '\n'

pattern = '.'

q1 = re.match(pattern,q)

w1 = re.match(pattern,w)

e1 = re.match(pattern,e)

r1 = re.match(pattern,r)

print(q1,'\n',w1,'\n',e1,'\n',r1)

#########\d的使用###########

q = '0123'#由结果看只能匹配一个

w = '5'

e = 'a'

r = ' 9'

pattern = '\d'

q1 = re.match(pattern,q)

w1 = re.match(pattern,w)

e1 = re.match(pattern,e)

r1 = re.match(pattern,r)

print(q1,'\n',w1,'\n',e1,'\n',r1)

##########\s的使用#############

q = ' '

w = '\n'

e = '\t'

r = '_'

pattern = '\s'

q1 = re.match(pattern,q)

w1 = re.match(pattern,w)

e1 = re.match(pattern,e)

r1 = re.match(pattern,r)

print(q1,'\n',w1,'\n',e1,'\n',r1)

##############[]的使用#############

q = '2'

w = '3'

e = '4'

pattern = '[2468]'

q1 = re.match(pattern,q)

w1 = re.match(pattern,w)

e1 = re.match(pattern,e)

print(q1,'\n',w1,'\n',e1)

#################测试结果#########################################

 

 

 None

 

 None

 None

 

 

 None

 None

 

Process finished with exit code 0

泽一匹配符（|）和列表

import re

#泽一和列表的相同点

pattern = '[xyz]'

pa1 = 'x|y|z'

s = 'z'

o = re.search(pattern,s)

o1 = re.search(pa1,s)

print(o,'\n',o1)

print('#########不同点#######')

#泽一和列表的不同点

pattern = '[ab][cd]'

pa1 = 'ab|cd'

s1 = 'bc'

s2 = 'ab'

o1 = re.search(pattern,s1)

o2 = re.search(pattern,s2)

a1 = re.search(pa1,s1)

a2 = re.search(pa1,s2)

print(o1,'\n',o2,'\n',a1,'\n',a2)

################结果##############################

 

#########不同点#######

 None

 None

 

Process finished with exit code 0