Finds match for valid Canadian postal code
Instructions: Implementation will vary between programming languages. Please note that the reason [A-Z] was not used in finding an uppercase letter is that there are letters that are not used in postal codes.
Regex matches B4P 2N9 but not Z2Q 3R1, which is how it should work, as the latter is not a valid postal code. see the wikipedia page for more info.
[ABCEFGHJKLMNPRSTVXY][0-9][ABCEFGHJKLMNPRSTVWXYZ] [0-9][ABCEFGHJKLMNPRSTVWXYZ][0-9]