rewriterule only for .php files

These are my current rules copied from my .htaccess file:

RewriteRule ([a-z]+) index.php?controller=$1 [QSA,NC]
RewriteRule ([a-z]+)/([a-z]+) index.php?controller=$1&event=$2
[QSA,NC]
RewriteRule ([a-z]+)/([a-z]+)/([a-z]+) index.php?controller=$1&event=
$2&meta=$3 [QSA,NC]

The php application works as intended, no problem there, but I cannot
use <link href="media/css/style.css"> because that is rewritten into
index.php?controller=media

How do I avoid this? The rewrite rules should only apply for .php
files and nothing else.

On Apr 11, 5:37 pm, Michael Daly <MichaelD... DeleteThis @foo.bar> wrote:
> Kris wrote:
> > RewriteRule ([a-z]+)/([a-z]+)/([a-z]+) index.php?controller=$1&event=
> > $2&meta=$3 [QSA,NC]
>
> > media/css/style.css"> because that is rewritten into
> > index.php?controller=media
>
> ([a-z]+) will not match on "style.css" - you have to account for the
> period. Try ([a-z.]+) with meta=$3 or ([a-z]+(.[a-z]+)?) with meta=$4.
> To be more specific on the file extension, you could use ([a-z]+(.css)?)
> with meta=$4.
>
> Google "regexp tester" to find a web-based regular expression tester.
> That will allow you to test the expression with your input and you'll
> see exactly what gets returned.
>
> Mike

But I only want to rewrite URLs where the .php extension is present or
where the index file is being used.
Any thing besides .php files should not be affected.