利用re模块分割含有多种分割符的字符串：

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

import re
a='Beautiful, is; better*than\nugly'
# 四个分隔符为：,  ;  *  \n
x= re.split(',|; |\*|\n',a)
print(x)

网页地址解析：

#coding=utf-8

str="http://www.runcodex.com/python/att-string-split.html"
print("0:%s"%str.split("/")[-1])
print("1:%s"%str.split("/")[-2])
print("2:%s"%str.split("/")[-3])
print("3:%s"%str.split("/")[-4])
print("4:%s"%str.split("/")[-5])

print("5:%s"%str.split("/",-1))
print("6:%s"%str.split("/",0))
print("7:%s"%str.split("/",1))
print("8:%s"%str.split("/",2))
print("9:%s"%str.split("/",3))
print("10:%s"%str.split("/",4))
print("11:%s"%str.split("/",5))

结果是：

0:att-string-split.html
1:python
2:www.runcodex.com
3:
4:http:
5:['http:', '', 'www.runcodex.com', 'python', 'att-string-split.html']
6:['http://www.runcodex.com/python/att-string-split.html']
7:['http:', '/www.runcodex.com/python/att-string-split.html']
8:['http:', '', 'www.runcodex.com/python/att-string-split.html']
9:['http:', '', 'www.runcodex.com', 'python/att-string-split.html']
10:['http:', '', 'www.runcodex.com', 'python', 'att-string-split.html']
11:['http:', '', 'www.runcodex.com', 'python', 'att-string-split.html']

配合 join 实现，replace 重写:

astr = "hello world ,hhhh world heihei"
def myreplace (astr,oldstr,newstr):
    result=astr.split(oldstr)
    return newstr.join(result)
print(myreplace(astr,"world","job"))

结果:

hello job ,hhhh job heihei