Cookbook & regex

[F-Loyer]

The cookbook gets ideas from the Rust Cookbook... but there are 2 ideas which are questionable.

email... a regex compatible with the RFC822 is rather complex (see https://pdw.ex-parrot.com/Mail-RFC822-Address.html) and doesn't compile with OCaml Re.Perl or Re.Pcre. The one proposed by the Rust cookbook is wrong. It doesn't match my address (because of the tiret in "club-internet` !). But The Emile parser can be a good alternative (and perhaps outside regex ?).

phone number. The Rust recipe is very US centric since there are no international phone rules. (And its regex hardcode the +1 country code).