I´m in the process of transferring my pages from html to php.
For SEO, I would like to move all the pages ending with -en.php to a subdirectory /English/ and all those ending with -fr.php to /French/.

I would also need to redirect the old html pages to the new ones.

I tried RewriteRule ^English/(.*?)-en.php$ /home-en.php and the pages seem to be located under /English/ but all the pages are there, not just the ones ending with -en.php.

I can´t work out what the code should be like.

you need to escape special characters in your pattern
RewriteRule ^English/(.*?)-en\.php$ /home-en.php

besides you need to specify which page was clicked in the target url

I think it would be
RewriteRule ^English/(.*?)-en\.php$ /$1-en.php

Thanks for your answer, nayes84. I tried the code you suggested but still it moves all the pages in that subdirectory, not just those with -en.php. I tried also to put an escape character in front of the dot in $1-en\.php but it made no difference.