I am trying to add a rule to my website which will cause the Error 404 "Page not found" for certain requests on the server. I would like any request such as mathsrev.com/?s=types+of+progression+in+math to cause the Error 404 "Page not found", so maybe use regular expressions. mathsrev.com/?s=[A-Z0-9\-] The about url to cause the Error 404 "Page not found" Please help.