Canada postal code /^((:<FSA>[ABCEGHJKLMNPRSTVXY][0-9][ABCEGHJKLMNPRSTVWXYZ])) ?(:<LDU>[0-9][ABCEGHJKLMNPRSTVWXYZ][0-9])$/i, $FSA $LDU A Canadian postal code is a postal code that pertains to a geographic region of Canada. Note that a Canadian postal code can cover multiple communities. Secondly, postal codes can be retired, and then reintroduced elsewhere. Historical data associations may need to take the date of postal code mapping into account. Postal Code Zip Code requires discussion