python正则表达式贪婪匹配和零宽断言

贪婪匹配reference：
https://www.cnblogs.com/yizhenfeng168/p/6985020.html
https://blog.csdn.net/m0_37852369/article/details/79101892
零宽断言reference：
https://blog.csdn.net/yj1556492839/article/details/79420014
https://blog.csdn.net/magictong/article/details/5332423