Enhance Customer example with read validation

[joe-mojo]

Validate AdressNumber and PostalCode with regex so that a badly formated address JSON couldn't be parsed as Address.
Example : AdressNumber must be parsed from "3", "3 Bis", "3-10" but not "Your tiny bikini"
and so on for PostalCode (use a rather general regex, because the reallity is more complex : each country has its own format)