I'm working together with IcepickD on same problem, he is not able to answer your questions this week.
First, IcepickD made one mistake, rewrite rules aren't defined in .htaccess file but in httpd.conf file (more precisely in another config file (eg. xyz.cong) which is included in httpd.conf).
@lucy24 asked what "everything from" means:
It means everything that begins with "www.example.net/tece"
@JD_Toims, I have tried your rewrite rule but it won't work :(
Could it be that the fact that '/tece' folder doesn't exist makes a problem?
Also, maybe it is important to know that there is a redirection in root folder index.jsp page:
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
This redirection redirects all "www.example.com" requests to "www.example.com/fr/index.jsp". Could it be that this is messing with redirect rulles defined in Apache's confs files?