Express.JS - Dynamic Route Alias - regex

Question

I am designing a community site that will allow users to login and befriend others, and their account will be accessible via the following routes:
https://domain.com/en/community/id/:userid AND
https://domain.com/en/community/users/:username
However I want to always want users to use the first URL as it looks more aesthetically pleasing. I could just redirect straight from the ID route, but with the planned friends and groups, I will end up with URLS such as:
https://domain.com/en/community/id/:userid/friends
https://domain.com/en/community/users/:username/friends
https://domain.com/en/community/id/:userid/groups
https://domain.com/en/community/users/:username/groups
How can I always redirect from /id/:userid to /users/:username but keep the rest of the URL?
The first task is matching all URLs with /id/:userid to use the same route callback.
The second task is to replace the /id/:userid with /users/:username.
Can these two tasks be achieved with Regular Expressions?
Thank you very much.

Answer 1

Okay, it turns out it was very simple to allow the user ID alias.
I can use an asterisk to capture all the other URLs, and then use a simple RegExp replace call to replace the ID with the Username.
app.get('/:lang/community/id/:id/*', function(req, res){
var id = req.params.id;
User.getByID(id, function(err, result, user){
var url = req.url.replace(new RegExp('/id/'+id, 'g'), '/users/'+user.name);
res.redirect(url);
}
});
This is the best solution I could think of. I hope it helps other people.