‘nosubreq|NS' (used only if no internal sub-request)如果是内部子请求则跳过
‘nocase|NC' (no case)忽略大小
‘qsappend|QSA' (query string append)附加查询字符串
‘noescape|NE' (no URI escaping of output)禁止URL中的字符自动转义成%[0-9]+的形式。
‘passthrough|PT' (pass through to next handler)将重写结果运用于mod_alias
'skip|S=num' (skip next rule(s))跳过下面几个规则
‘env|E=VAR:VAL' (set environment variable)添加环境变量
实战
例子：
RewriteEngine on
RewriteCond %{HTTP_USER_AGENT} ^MSIE [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^Opera [NC]
RewriteRule ^.* - [F,L] 这里”-”表示没有替换，浏览器为IE和Opera的访客将被禁止访问。
例子：
RewriteEngine On
RewriteBase /test
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ([^/]+)$ /test/$1.php
#for example: /test/admin => /test/admin.php
RewriteRule ([^/]+).html$ /test/$1.php [L]
#for example: /test/admin.html => /test/admin.php
限制目录只能显示图片
< IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !^.*.(gif|jpg|jpeg|png|swf)$
RewriteRule .*$ - [F,L]
< /IfModule>
