mod rewrite - mod_rewrite not redirecting for multilingual site when trailing slash missing -

I am currently developing a multilingual website. User URL can be used on the front page with the following format:

  http://example.com/en/ http://example.com/fr/

The problem is here

  Rewriteum ^ /? ([^. /] +) / (. *) $ $ 2? Lang = $ 1 [L, QSA]

Try it out:

< Pre> revwrite ^ /? ([Az] {2}) (/ (. *))? $$ 3? Lang = $ 1 [L, QSA]

Another option would be to redirect if the trailing slash is missing:

  RewriteRule ^ /? [Az] {2} $% {REQUEST_URI} / [L, R = 301]

Com