re模块

#! /usr/bin/python3
# -*-coding:UTF-8-*-

import re

print(re.match("hello","hello my world").span())       #在起始位置匹配，只匹配字符串开始部分，失败就返回None

print(re.match("hi","hi 你好"))

print(re.search("apple","banana orange apple").span())      #随意位置匹配，直到找到匹配对象，否则没有返回None
print(re.search("banana","banana orange apple").span())     #在起始位置匹配

#由于正则会消耗一定的资源，所以要用预编译
re_phone = re.compile(r'^(\d{3})-(\d{3,8})$')
print(re_phone.search('020-12345678').group())