# -*- coding: UTF-8 -*-

import re
print(re.match('www', 'www.runoob.com').span())  # 在起始位置匹配
print(re.match('com', 'www.runoob.com'))         # 不在起始位置匹配

line = "Cats are smarter than dogs";

matchObj = re.match(r'dogs', line, re.M|re.I)
if matchObj:
    print("match --> matchObj.group() : ", matchObj.group())
else:
    print("No match!!")

matchObj = re.search(r'dogs', line, re.M|re.I)
if matchObj:
    print("search --> searchObj.group() : ", matchObj.group())
else:
    print("No match!!")

phone = "2004-959-559 # 这是一个国外电话号码"

# 删除字符串中的 Python注释
num = re.sub(r'#.*$', "", phone)
print("电话号码是: ", num)

# 删除非数字(-)的字符串
num = re.sub(r'\D', "", phone)
print("电话号码是 : ", num)