Best way to do this?

[eluser]Agustín Villalba[/eluser]
I think your problem it's not related with enable_query_strings, I think your problem is this line

redirect('/reader/search/'.urlencode($search_string));

because the CI function redirect does the urlencode for you, so you are doing a double urlencode, and that raises the error. Try this:

redirect('/reader/search/'.$search_string);