拆分

split(pattern, string, maxsplit=0, flags=0)

# \s ：空格
import re
str = "China  is a great country"
x = re.split("\s", str)
print(x)

结果：['China', '', 'is', 'a', 'great', 'country']

import re
print(re.split('\d+','a1ab2ccc3d4'))

结果：['a', 'ab', 'ccc', 'd', '']

import re
pattern=re.compile(r'\d+')
m=re.finditer(pattern,'a1b2c3d4')
list1=[x for x in m]
print(list1)

结果：

[<re.Match object; span=(1, 2), match='1'>, <re.Match object; span=(3, 4), match='2'>, <re.Match object; span=(5, 6), match='3'>, <re.Match object; span=(7, 8), match='4'>]

替换

import re
pat=re.compile(r'\d+')
change=re.sub(pat,'!','py1th2on')
print(change)

结果：py!th!on

import re
pat=re.compile(r'\d+')
change=re.sub(pat,'!','py1th2on',count=1)
print(change)

结果：py!th2on

import re
pat=re.compile(r'\d+')
change=re.subn(pat,'!','py1th2on333',count=2)
print(change)

结果：('py!th!on333', 2)

结果是元组