regsub failing

Give this a try:

when HTTP_REQUEST {
  HTTP::version 1.0
}
when HTTP_RESPONSE {
  HTTP::collect 4294967295
}
when HTTP_RESPONSE_DATA {
  set find ":8088"
  set replace ""
  log local0. "payload: [HTTP::payload]"
  if {[regsub -all $find [HTTP::payload] $replace new_response] > 0} {
    log local0. "Match found - regsub returned greater than zero!"
    log local0. "New Response: $new_response"
    HTTP::payload replace 0 [HTTP::payload len] $new_response
  } else {
    log local0. "No match found - regsub returned zero!"
  }
}

All the "log" statements will put the strings into the /var/log/ltm file.

*Note1 : that I removed the $payload variable to avoid an unnecessary copy of the entire payload value.

*Note2 : Make sure you remove the log commands before moving this rule into production.

*Note3 : If you have it available, I would still highly recommend using the Stream profile for this if you can. It has much less overhead on the system.

-Joe