Policies or iRules for Redirection to at least 2 URLs

Hello , 
>>    I see you want to add a /path , so Try this iRule For redirection : 
when HTTP_REQUEST {
  if { ([string tolower [HTTP::host]] eq "host1") and ([string tolower [HTTP::uri]] eq "/path1") } {
        HTTP::redirect "http://host1/path2"
    } elseif { ([string tolower [HTTP::host]] eq "host2") and ([string tolower [HTTP::uri]] eq "/path3") } {
        HTTP::redirect "http://host3/path4"
    }
}
>> For Pool selection , you can add pool Action selection after each Redirection selection "HTTP::redirect "http://host1/path2" . 
Or you can create another iRule for Pool Selection and attach it to the same Virtual server.