添加-正则表达式链接

Author: Kr1s77

README.md

@@ -16,6 +16,7 @@
 - [03 - requests模块的使用](https://github.com/CriseLYJ/Python-crawler-tutorial-starts-from-zero/blob/master/%E7%BD%91%E7%BB%9C%E8%AF%B7%E6%B1%82%E6%A8%A1%E5%9D%97%E7%9A%84%E4%BD%BF%E7%94%A8.md)
 - [04 - 数据提取概念和数据的分类](https://github.com/CriseLYJ/Python-crawler-tutorial-starts-from-zero/blob/master/%E6%95%B0%E6%8D%AE%E6%8F%90%E5%8F%96%E6%A6%82%E5%BF%B5%E5%92%8C%E6%95%B0%E6%8D%AE%E7%9A%84%E5%88%86%E7%B1%BB.md)
 - [05 - JSON](https://github.com/CriseLYJ/Python-crawler-tutorial-starts-from-zero/blob/master/JOSN%20%E6%95%B0%E6%8D%AE%E6%8F%90%E5%8F%96.md)
+- [06 - re 正则表达式提取数据](https://github.com/CriseLYJ/Python-crawler-tutorial-starts-from-zero/blob/master/06%20-%20%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%20%E6%8F%90%E5%8F%96%E6%95%B0%E6%8D%AE.md)
 
 
 # 实例目录