about not contain

is that correct?

if-condition looks okay to me but d in drop should be in small letter.

anyway, to make it easier to read, you may code something like this.

e.g.

when HTTP_REQUEST {
  set http_path [string tolower [HTTP::path]]

  if { $http_path contains ".jsp" } {
    if { not ($http_path contains "sample.jsp") } {
      drop
    } else {
       Do something
    }

  } else {
     Do something
  }
}