title: URLRewrite in .htaccess - convert last "-" in a "/"
body: <p>I'm migrating a website to a new CMS, and I had to provide custom redirects for old permalink.
  I solved the classic "pageId=x" rewrite+redirect with a custom PHP script that reads in a key-value store the new slug given the old id.</p>
  
  <p>But, I also have various articles that already have a rewritten URL like: <code>/my-slug-page/</code>. Most of them should not be rewritten, except for multipage articles that have a structure like: <code>/my-multipage-article/</code>, <code>/my-multipage-article-2/</code>, <code>/my-multipage-article-3/</code>, etc. (the last digit after the last <code>-</code> is the page number).</p>
  
  <p>I have to rewrite these links to: <code>/my-multipage-article/2/</code>, <code>/my-multipage-article/3/</code> etc.
  Can I do this directly in the .htaccess with a standard regex parsing? </p>