Having trouble understand how rewrite works

[António P. P. Almeida]

On 19 Out 2011 17h51 WEST, noagbodjivictor at gmail.com wrote:

> Thanks again. I understand the map solution. Here's another issue,
> you see, the links below all map to the index page (there are other
> pages too, that have those PageID, ParentPageID, etc.. parameters).
>
> /index.cfm?PageID=1
> /index.cfm?resetCache=yes
> /index.cfm?PageID=1&ParentPageID=1&NavID=1
> /index.cfm?PageID=22&ParentPageID=1&NavID=22
> /index.cfm?PageID=14&ParentPageID=38&NavID=38&ReferringPage=1
>
> all map to / (index)

Taking the lead from Denis, try:

map $request_uri $is_old {
   default 0;
   ~/index\.cfm\?PageId=\d+ 1;
   ~/index\.cfm\?PageID=\d+&ParentPageID=\d+&NavID=\d+ 1;
   ~/index\.cfm\?PageID=\d+&ParentPageID=\d+&NavID=\d+&ReferringPage=\d+ 1;
}

> /index.cfm?PageID=35&ParentPageID=26&NavID=26
> /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=8&PageText=off
> /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=9&PageText=off
> /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=10&PageText=off
> /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=15&PageText=off
> /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=16&PageText=off
> /index.cfm?PageID=35&ParentPageID=26&NavID=35&ProductID=11&PageText=off

map $request_uri $is_old_also {
   default 0;
   ~/index\.cfm\?PageID=\d+&ParentPageID=\d+&NavID=\d+&ProductID=\d+&PageText=off 1;
}  

Then you use the same type of if in location like exemplified by Denis
before. Just also a test for $is_old_also.

...

if ($is_old_also) {
  return 301 <uri to new page here>;
}

> and these for example would map to another unique page.
>
> The parameters specify the actual page that must be mapped to. And
> since I now know I can't use regex on query parameters, is there a
> way to handle this situation?

See above. Try it.

--- appa