.htaccess mod rewrite directory index

Question

I would like to remap index.php file as a directory..

Im real url, it is simply: localhost/app/index.php?app=my-app

I am new in mod_write and I know how it really works. I tried to use this:

RewriteRule ^app/(.*)/?$ index.php?app=$1 [QSA]

And it only works with localhost/app/my-app.. now how can I make it work on with or without slashes at the end and also with a filename index.php..

I want something like this:

• localhost/app/my-app
• localhost/app/my-app/
• localhost/app/my-app/index.php (if other filename then error)

Answer 1

RewriteRule ^app/([^/]*)(?:|/|/index\.php)$ index.php?app=$1 [QSA]

See Regex101.

EDIT: Fixes (see comments)