Ruby on Rails

  match "/*path", to: redirect { |params, request|

    # Add your logic here or delegate the work to a specific class

    # Proof of concept

    slug = 'jazz' # You get the slug from the params

    price_category = true # You deduce if the slug matches any of your tags

    if price_category

      "/#{slug}?price=cheap"

    else

      slug

    end

  }, via: :all