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(mpls ldp)
 (router-id) ([^\n]+)
...
 interface ([^\n]+)
 !
 !

      while (@MASK_VARIABLES = $current_cfg =~ /$mask_tmp/s) {
         $MASK_VARIABLES = join(",",@MASK_VARIABLES);
...
         #
         $current_cfg =~ s/$mask_tmp//s;
      }