I am looking to redirect url's in a multi-lingual site if it doesn't contain a language string. For example, if the url comes in as:
http://www.example.com/overview/features
I would like to redirect it to
http://www.example.com/en/overview/features
... i.e. insert the 'en' language string into the url. If it does contain the string then it is left alone.
I hazard a guess this is using negative look backs/forwards, but my .htaccess skills don't seem to be up to the above scenario.
Any ideas?