I have an URL rewrite that I've been using successfully for years:
RewriteRule ^([^/]*)/([^/]*)/([^/]*)/articles/([^/]*)/([^/]*)/$ /articles.php?a=$1&b=$2&c=$3&d=$4&e=$5 [L]

I developed a un-related new feature on our site that had unintentional conflicts with this re-write. I allowed members to dynamically create directory-styled URLs on their pages for better organization and SEO-friendly URLs:

One directory that a member created was: "articles", which fires off the re-write above and screws up the page. It's an extremely rare coincidence that a member named the 4th level directory of their page: "articles", which is the only thing that could conflict with my rewrite script.

What can I do in my top re-write script to ignore rewriting if the 1st level directory is "memberpage", because this word will always be fixed for all members