I'm trying to get my article url's to just have the domain name, article title and article id e.g. www.mydomin.com/article-title-1.

I can do this with the following:

RewriteRule ([A-Za-z0-9-]+)-([0-9]+) dynamic/index.php?dynamic_url=$1&id=$2

but this seems to interfere with any file in the entire site that ends in the format of a string/number-number e.g. www.mydomain.com/images/image-1

Is their a way of specifying this rewrite condition on to files appearing directly after the domain name?