Slashes in routes

Is it possible to do slashes inside a regex match? I want to match

And then have that go into my display function with the string "path/to/something"

I tried this in my routes file, but didn't have any luck.
$route['controller/([A-Z0-9/])'] = 'controller/display/$1';

To do slashes inside regex, prepend the slash like this

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