single vs multi element classes in irules

If you need to loop through the datagroup to perform an operation with the key or value, you can use a class loop:

    Save a class name to search through
   set class_name t1_http_request_limit_dglxx2

    Save a search ID for the datagroup
   set id [class startsearch $class_name]

    Loop through the class row by row
   while {[class anymore $class_name $id]}{

set element [class nextelement $class_name $id]
log local0. "\[class nextelement $class_name $id\]: $element"

 Perform some operation against the current datagroup key and/or value
scan $element {%[^ ] %d/%d} a b c
log local0. "scanned $element: $a, $b, $c"
   }
    Clean up the search
   class donesearch $class_name $id

This works for a single line or multiple line data group. I think the reason your original rule isn't working as expected is that the name and value returned using class get against a single line data group is interpreted as a two element TCL list: {name} {value}, whereas a multiple line data group is interpreted as {name1 value1} {name2 value2}.

Aaron