nginx之rewrite规则未加引号导致检查nginx语法报错
在nginx的站点配置文件中使用了rewrite，检查rewrite规则确定是没问题，但是在rewrite中带有"{}"时，此时检查nginx语法报错rewrite规则：
# grep rewrite /usr/local/nginx/conf/vhost/img.test.conf rewrite ^/.{4}{4}{8}/(.*)$ /uploads/picture/$1 last;
检查语法报错：
# /usr/local/nginx/sbin/nginx -t
nginx: directive "rewrite" is not terminated by ";" in /usr/local/nginx/conf/vhost/img.test.conf:8
nginx: configuration file /usr/local/nginx/conf/nginx.conf test failed
错误原因：这是由于规则里有大括号“{ }”的符号，Nginx误以为这是规则的结尾，产生错误
解决的办法：把规则段使用单引号或者是双引号引起来
# grep rewrite /usr/local/nginx/conf/vhost/img.test.conf rewrite '^/.{4}{4}{8}/(.*)$' /uploads/picture/$1 last;
或者：
# grep rewrite /usr/local/nginx/conf/vhost/img.test.conf rewrite "^/.{4}{4}{8}/(.*)$" /uploads/picture/$1 last;
# /usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
此规则简单说明：
.{4}指的是任意4个字符，{4}任意4个数字，{8}任意8个数字
应用环境说明：
此服务器充当图片服务器，由nginx来提供服务，应用配置环境如下：
# grep root /usr/local/nginx/conf/vhost/img.test.conf root/data/www/images;
# ll /data/www/images/uploads/picture/2016/07/28/1469696883.jpeg
-rw-r--r--. 1 root root 65824 Jul 282016 /data/www/images/uploads/picture/2016/07/28/1469696883.jpeg
# ll /data/www/images/uploads/picture/2016/07/28/1520924032.png
-rw-r--r--. 1 root root 89032 Mar 13 14:53 /data/www/images/uploads/picture/2016/07/28/1520924032.png
#
浏览器请求图片，此时图片正常显示：
http://img.test.com/MTEy114512345678/2016/07/28/1469696883.jpeg
http://img.test.com/MTEy114512345678/2016/07/28/1520924032.png
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