htaccess URL重写不适用于子文件夹

I'm trying to create a URL rewrite. I've looked all around on the net for a generator create a rewrite for this URL, but can't find anything that I'm looking for specifically. This is what I've come up with so far, though obviously, it isn't working.

Options +FollowSymLinks
RewriteEngine on
RewriteRule index/html/(.*)/ index.php?html=$1

The URL rewrite that I'm looking for would look like this.

No rewrite: http://example.com/asysc/code/index.php?html=some-text-here-

Rewrite: http://example.com/asysc/code/html/some-text-here

I've someone would be as so kind and helping me with the right rewrite would look like, it would be greatly appreciated.

Thanks, Jon