How to parse custom params from a given URL inside a controller?

How can I parse the params from a custom URL?

Lets say I have a User class that implements a to_param and a from_param method and I have a backend admin where a "customer" can insert an URL from a user (profile) page (e.g. http://localhost:3000/users/JohnDoe-123security456-123 where 123 is the ID).

Is it possible to generate a custom params object or something similar to parse the id from the url? My goal is to reuse the existing logic instead of creating another regex.

I know I could do something like: "http://localhost:3000/users/JohnDoe-123security456-123/custom_action?abc=def".gsub(/^.*\/users\//, '').gsub(/\/.*$/,'') (or something more suffisticated) to get the id.

Here is the pseudocode of what I try to achieve.

class User < ActiveRecord::Base
  def to_param
    "#{name}-#{security-token}-#{id}"
  end

  def self.id_from_param(param_id)
    param_id.to_s.gsub(/.*-/,'')
  end
end

class AdminUserController < ActionController::Base
  def search
    url = params[:url]
    parsed_params = some_method_that_extracts_the_params_from_url(url) # (1)
    user_id = User.id_from_param(parsed_params[:id])
  end
end