irule stream::exporession and data group list

Another option would be to store the expressions each as a single entry in the string data group

class stream_expressions {
   {
      "@five@six@"
      "@nine@ten@"
      "@one@two@"
      "@seven@eight@"
      "@three@four@"
   }
}

Then you could do something like this to pull each one out and append it to a string and use that for the expression

set expressions [class get stream_expressions]
  set se ""
  foreach {re} $expressions {
    append se [lindex $re 0]
  }
  if { [llength se] > 0 } {
    STREAM::expression $se;
  } else {
    STREAM::disable;
  }
}

Of course, you could just store the entire concatenated string as a single entry as well and that would save on some string allocations. The class would look something like this

class stream_expressions {
   "@one@two@@three@four@@five@six@@seven@eight@@nine@ten@"
}

And the iRule could be like

  set se [lindex [class element 0 stream_expressions] 0];
  if { [llength se] > 0 } {
    STREAM::expression $se;
  } else {
    STREAM::disable;
  }
}

Hope this helps...

-Joe