htaccess文件将/ stringa重定向到/index.php?action=stringb

Question

我有以下.htaccess文件，我需要将/stringa重定向到/index.php?action=stringb

<IfModule mod_rewrite.c>
   RewriteEngine On
   RewriteBase /app/
   RewriteRule ^model/(.*)$ /app/index.php [R=301,NC,L]
   RewriteRule ^view/(.*)$ /app/index.php [R=301,NC,L]
   RewriteRule ^util/(.*)$ /app/index.php [R=301,NC,L]
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteCond %{REQUEST_FILENAME} !-l
   RewriteRule ^stringa$ /app/index.php?action=stringb [L,R=301]
   RewriteRule ^ /app/index.php [L,R=301]
</IfModule>