Selenium+python --使用正则表达式爬取页面的URL链接

follow yoyo

# coding:utf-8
from selenium import webdriver
import re

driver = webdriver.Firefox()
driver.get("http://www.cnblogs.com/yoyoketang/")
page = driver.page_source
print(page)
url_list = re.findall('href="(.*?)"',page,re.S)
url_all = []
for url in url_list:
    if "http" in url:
        print(url)
        url_all.append(url)
print(url_all)

很不理解正则表达式的样式，不明白是什么意思：href="(.*?)"
for...in..循环遍历