Irule to Analize traffic

Can you be a bit more specific on what you want the iRule to do? If all you want to do is look for URI's that contain rodrigo you could do so with a simple string comparison and log the results to the system log

when HTTP_REQUEST {
  if { [HTTP::uri] contains "rodrigo" } {
    log local0. "URI rodrigo match: '[HTTP::uri]'"
  }
}

This will put a timestamped entry in the log file with the full URI of each request that has a rodrigo in it.

If you were looking for more than this, let me know more details and we'll see what we can come up with.

-Joe