Hello I've this rewrite Rule inside my Wordpress

RewriteRule ^trip/(.*)/$ /index.php?page_id=143&trip=$1 [L]

Its working however i have this issue.. after i enter page known as -

http://example.com/trip/22/?lang=en

the $_GET['lang'] does not work. I guess the url has become something similar to

/index.php?page_id=143&trip=22?lang=en

which does not work.. Can someone advice me how you can replace the question mark from ?lang=en with &lifier ..

I believe you simply need the QSA flag.