Need an iRule to redirect site http://mysite/projects/test for redirect to http://mysite/sites/testforredirect

the problem is if someone has bookmarked a location for instance for redirect/shared documents/document1. It needs to go to documents/document1.

e.g.

 configuration

[root@ve11a:Active:In Sync] config  tmsh list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 19
}
[root@ve11a:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  if { [HTTP::uri] starts_with "/projects/test_for_redirect/" } {
    set newuri [string map {/projects/test_for_redirect/ /sites/testforredirect/} [HTTP::uri]]
    HTTP::redirect "http://[HTTP::host]$newuri"
  }
}
}

 test

[root@ve11a:Active:In Sync] config  curl -I http://172.28.24.10/projects/test_for_redirect/shared_documents/document1
HTTP/1.0 302 Found
Location: http://172.28.24.10/sites/testforredirect/shared_documents/document1
Server: BigIP
Connection: Keep-Alive
Content-Length: 0