nginx rewite 规则，官方文档：http://wiki.nginx.org/NginxHttpRewriteModule
nginx rewrite规则格式：rewrite regex replacement flag
其中flag标记有四种格式：
可以放在server, location 和 if 模块中。
匹配判断：
~ 为区分大小写匹配; !~为区分大小写不匹配
~* 为不区分大小写匹配；!~为不区分大小写不匹配
例如，设定nginx在用户使用ie的使用重定向到/nginx-ie目录下：
附，常用nginx Rewrite 规则配置代码。
1、只使用一个网址，比如主力网址设为www.plchome.org。
访问plchome.org时，会自动跳转到www.plchome.org。
2、防盗链
盗链时则返回403错误，允许的域名可以直接跟在第二行的域名后面。
3、wordpress的Rewrite
目前，代码收藏上就是使用的这段代码。
4.bo-blog在nginx下nginx rewrite 规则
if (!-e $request_filename) {
rewrite ^/post/([0-9]+)/?([0-9]+)?/?([0-9]+)?/?$ /read.php?entryid=$1&page=$2&part=$3 last;
rewrite ^/page/([0-9]+)/([0-9]+)/?$ /index.php?mode=$1&page=$2 last;
rewrite ^/starred/([0-9]+)/?([0-9]+)?/?$ /star.php?mode=$1&page=$2 last;
rewrite ^/category/([^/]+)/?([0-9]+)?/?([0-9]+)?/?$ /index.php?go=category_$1&mode=$2&page=$3 last;
rewrite ^/archiver/([0-9]+)/([0-9]+)/?([0-9]+)?/?([0-9]+)?/?$ /index.php?go=archive&cm=$1&cy=$2&mode=$3&page=$4 last;
rewrite ^/date/([0-9]+)/([0-9]+)/([0-9]+)/?([0-9]+)?/?([0-9]+)?/?$ /index.php?go=showday_$1-$2-$3&mode=$4&page=$5 last;
rewrite ^/user/([0-9]+)/?$ /view.php?go=user_$1 last;
rewrite ^/tags/([^/]+)/?([0-9]+)?/?([0-9]+)?/?$ /tag.php?tag=$1&mode=$2&page=$3 last;
rewrite ^/component/id/([0-9]+)/?$ /page.php?pageid=$1 last;
rewrite ^/component/([^/]+)/?$ /page.php?pagealias=$1 last;
#Force redirection for old rules
rewrite ^/read.php/([0-9]+).htm$ http://$host/post/$1/ permanent;
rewrite ^/post/([0-9]+).htm$ http://$host/post/$1/ permanent;
rewrite ^/post/([0-9]+)_([0-9]+).htm$ http://$host/post/$1/$2/ permanent;
rewrite ^/post/([0-9]+)_([0-9]+)_([0-9]+).htm$ http://$host/post/$1/$2/$3/ permanent;
rewrite ^/index_([0-9]+)_([0-9]+).htm$ http://$host/page/$1/$2/ permanent;
rewrite ^/star_([0-9]+)_([0-9]+).htm$ http://$host/starred/$1/$2/ permanent;
rewrite ^/category_([0-9]+).htm$ http://$host/category/$1/ permanent;
rewrite ^/category_([0-9]+)_([0-9]+)_([0-9]+).htm$ http://$host/category/$1/$2/$3/ permanent;
rewrite ^/archive_([0-9]+)_([0-9]+).htm$ http://$host/archiver/$1/$2/ permanent;
rewrite ^/archive_([0-9]+)_([0-9]+)_([0-9]+)_([0-9]+).htm$ http://$host/archiver/$1/$2/$3/$4/ permanent;
rewrite ^/showday_([0-9]+)_([0-9]+)_([0-9]+).htm$ http://$host/date/$1/$2/$3/ permanent;
rewrite ^/showday_([0-9]+)_([0-9]+)_([0-9]+)_([0-9]+)_([0-9]+).htm$ http://$host/date/$1/$2/$3/$4/$5/ permanent;
#Filename alias
rewrite ^/([a-zA-Z0-9_-]+)/?([0-9]+)?/?([0-9]+)?/?$ /read.php?blogalias=$1&page=$2&part=$3 last;
}