Change URI parameters with a 301 redirect

iRules has a helper function that will do exactly what you want. The findstr command searches a string for a substring and returns that substring up to a terminating character.

This should do it for you:

when HTTP_REQUEST {
  set zoneid [findstr [HTTP::uri] "zoneId=" 0 "&"]
  if { [string length $zoneid] > 0 } {
    HTTP::redirect "http://[HTTP::host][HTTP::path]?$zoneid"
  }
}

The findstr command above looks in the HTTP::uri value for the string "zoneId=" and will return that string including all trailing characters after that string until it hits the termination character of "&" or the end of string. So this sould return "zoneId=624906" for you above example URIs. Then the HTTP::redirect command is issued on a newly built URI with the original path "/example.jsp" appended with a "?" and the found "zoneId=624906"

Keep in mind that this example is not case-sensitive so URIs with "ZONEID=..." will not match. If you want to match for all case examples of "zoneid=", then you with have to do a "string tolower" on the HTTP::uri before the test and only test for a lower case character.

Also, keep in mind that a redirect will only occur for URI's that have the "zoneId=" query string argument in them.

Hope this helps...

-Joe