Simple RegEx question

I'm learning regular expressions, and trying to figure out what's possible and what's not. Any ideas of how to create a preg_match expression to parse following three lines: Calgary, AB T2A6C1

Toronto, ON     T4M 0B0
Saint John,  NB    E2L 4L1

...such that it splits each line into City, Province and Postalcode (irrespective of occasional white space), e.g.: Array ( [city] => "Calgary", [prov] => "AB", [postal] => "T2A 6C1" ) Array ( [city] => "Toronto", [prov] => "ON", [postal]=> "T4M 0B0" ) Array ( [city] => "Saint John", [prov] => "NB", [postal]=> "E2L 4L1" )