Help with nodejs module

Question

I'm making this nodejs module that reminds a little bit of django.
It's a library to make dynamic sites with express easier.
And without need of ajax calls.

You can choose a port and start a web server.
After that you can specify routes using .get and .post methods.
You can also return a view of your html file that uses html templating engine so you can pass arguments into your document.

server.get("/index", function(request) {
return server.view("index.html", {
"title": "Home page"
});
});

All of this is working great. I need help with URL rewriting.
The first parameter is the path where the content is returned to.
I want somehow to include url parameters on it.
I was thinking something like this

server.get("/index/<user>", function(request) {
return server.view("index.html", {
"title": "Home page"
});
}).regex({
"user": "[a-zA-Z0-9]"
});

The "<user>" could be replaced with any value that matches the regex.
Values for those parameters should be stored in a object and passed into the callback
{"user": "value"};

Currently the routes are stored in a object like this

const routes = {
"get": {
"/index/<user>": function(request) {
return "Hello World";
}
},
"post": {}
}

If the server returns a path like "/index/toni".
It should know that "/index/<user>" is the right callback for it.

Answer 1

To make it clearer, imagine the task like this.

const routes = {
"get": {
"/index/<id>/<user>" {
"callback": function(query) {
return query.user;
},
"params": {
"id": "[0-9]",
"user": "[a-zA-Z0-9]"
}
}
},
"post": {}
}

function regex(path) {
//Return the right function from routes object
}

console.log(regex("/index/1/toni")());

Edit the routes object as much as you like to store the regex expressions for each parameter.