hex is not working in 4.0.x

hex conversion of mac address used to work previously, (0) EXPAND 0x%{hex:%{DHCP-Client-Hardware-Address}} (0) EXPAND %{DHCP-Client-Hardware-Address} (0) --> 00:a0:bc:6c:7e:4e (0) EXPAND %{hex:%{DHCP-Client-Hardware-Address}} (0) (%{hex:00:a0:bc:6c:7e:4e}) (0) --> 00a0bc6c7e4e (0) --> 0x00a0bc6c7e4e Now it is broken, (0) EXPAND 0x%{hex:%{DHCP-Client-Hardware-Address}} (0) EXPAND %{DHCP-Client-Hardware-Address} (0) --> 00:a0:bc:6c:7d:3a (0) EXPAND %{hex:%{DHCP-Client-Hardware-Address}} (0) (%{hex:00:a0:bc:6c:7d:3a}) (0) --> 000000000000 (0) --> 0x000000000000 Regards, Nagamani Chinnapaiyan