http://blog.linuxchina.net/2016/10/20/nginx-rewrite%e4%bb%8e%e4%b8%80%e4%b8%aaurl%e8%b7%b3%e8%bd%ac%e5%88%b0%e5%8f%a6%e5%a4%96%e4%b8%80%e4%b8%aaurl/
nginx 常见正则匹配符号表示
【Nginx用法】nginx location正则表达式写法，详解Nginx location 匹配规则
