url > anchor routing

[eluser]Slowcheetah[/eluser]
How is it possible to route/redirect the following...

/product/4/

to

/product#4

I tried to use the # symbol in the routes.php but that didn't worked.

[eluser]pistolPete[/eluser]
Routes are internal, I guess you need a real redirect.
Have a look at the user guide: url helper

Code:

$this->load->helper('url');
redirect('/product#4');