techGetLxExtractLayers does not work as intended

 Hi,

 I need to extract the layer names defined in the validLayers section of virtuosoDefaultExtractorSetup constraint group in the techfile. I was using techGetLxExtractLayers function for this purpose and it was working fine when the  format of the virtuosoDefaultExtractorSetup constraint group for validLayers did not include layer purposes. 

Now that layer purposes are also included as shown below, the function returns only ("CONT" "VIAS1"). My intention is to get the routing layer names or all the layer names defined in the validLayers section. Is techGetLxExtractLayers function not intended for this purpose ? Is there any new function available to do this task ? Could you hlp me out?

virtuosoDefaultExtractorSetup(

( interconnect ( (vaildLayers ( (METAL1 drawing)

                                            (METAL1 pin)

                                            (CONT drawing)

                                            (VIAS1 drawing)

                                            (METAL2 drawing)

                                            (METAL2 pin)

                                              so on ))

)))

Thanks,

Veena