postgreSQL update set only where cast is possible and ignore error?

Question

I have 2 columns in a PostgreSQL table. The mac_address_temp column is for migration from character type to MAC-address type:

mac_address      | macaddr               |
mac_address_temp | character varying(17) |

I want to migrate data from mac_address_temp to mac_address, but there is some data that can't be cast as macaddr type.

mac_address | mac_address_temp
-------------+------------------
            | AAB5:4f27:e299
            | AAB54f27e299

UPDATE mactable SET mac_address = CAST(mac_address_temp as macaddr);
ERROR:  invalid input syntax for type macaddr: "AAB5:4f27:e299"

Is there a way to ignore where CAST doesn't work and still update rest of the table?