Sorry,
but I was so stupid to tell you this redirect could work. It is not possible at all!
This is the reason. You just need to add the fragment to the URL, but the fragment is just an anchor to a point in the page. When a browser must follow an URL with the fragment part, drop it from the request. I mean, when you say to the browser to call the link:
www.francois-rosenbaum.com/component/content/article/28-euratechnologies-laboratoire-des-nouvelles-technos#ancre_blog
It calls always:
www.francois-rosenbaum.com/component/content/article/28-euratechnologies-laboratoire-des-nouvelles-technos
And then search for anchor in the page. You can test it by yourself.
So, there's no way to stop loop in the redirect. And this is the reason why I don't create a macro for the fragment part (I already knew that was not needed, now I just forgot it, maybe I need an holyday).
You should create your page links with the fragment you need. Maybe you could find a plugin that does this.
Regards,
Luigi