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Cookbook: Email regex patch #2591

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Cookbook: Email regex patch #2591

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78d3cfd
Email regex patch
loyer78 Jul 10, 2024
abe7228
Update 00-re.ml
F-Loyer Jul 10, 2024
962b377
Update 00-re.ml
F-Loyer Jul 10, 2024
438542c
Update 00-re.ml
F-Loyer Jul 10, 2024
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30 changes: 22 additions & 8 deletions data/cookbook/regex-validate-email/00-re.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -11,14 +11,24 @@ let emails =
[| "[email protected]"
; "notAnEmail@jkorg"
; "[email protected]"
; "[email protected]"
; "[email protected]"
; "[email protected]"
; "[email protected]"
|]

(* Using the `Re` module from the `re` package, we create a `Perl` flavor
regular expression and `compile` it.*)
let validate_email_re =
Re.Perl.re "[a-zA-Z0-9.$_!]+@[a-zA-Z0-9]+\\.[a-z]{2,3}"
regular expression and `compile` it. The regular expression comes from
http://emailregex.com and is derived from RFC5322 *)
let validate_email_rfc5322_re =
Re.Perl.re "^(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\\\[\x01-\x09\x0b\x0c\x0e-\x7f])*\")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\\])$"
|> Re.no_case
|> Re.compile

(* A simpler regular expression can be used, but may fail to match
valid addresses *)
let validate_email_simple_re =
Re.Perl.re "^[a-zA-Z0-9.$_!+-]+@[a-zA-Z0-9-]+\\.[a-z]{2,3}$"
|> Re.compile

(* Using the `Re.execp` function, we check whether the given `regex` matches
Expand All @@ -29,22 +39,26 @@ let validate_email regex email =
then Printf.printf "%s has a valid email format\n" email
else Printf.printf "%s has an invalid email format\n" email

(* Let's test this by mapping the function returned by `(validate_email validate_email_re)`
(* Let's test this by mapping the function returned by `validate_email` and each regex.
over the `emails` array. *)
let () =
print_endline "Email Verification Results:";
print_endline "Email Verification Results (RFC5322):";
emails
|> Array.iter (validate_email validate_email_rfc5322_re)
let () =
print_endline "Email Verification Results (simple regex):";
emails
|> Array.map (validate_email validate_email_re)
|> Array.iter (validate_email validate_email_simple_re)

(* Now, we check for specific top-level domains in an email.
Notice the `|` operator (regular expression OR) at the end of the pattern *)
let validate_email_domain_re =
Re.Perl.re "[a-zA-Z0-9.$_!]+@[a-zA-Z0-9]+\\.[com|org|edu|io|gov|me]"
Re.Perl.re "^[a-zA-Z0-9.$_!]+@[a-zA-Z0-9]+\\.(com|org|edu|io|gov|me)$"
|> Re.compile

(* Let's test this by mapping the function returned by `(validate_email validate_email_domain_re)`
over the `emails` array. *)
let () =
print_endline "Email Verification Results:";
emails
|> Array.map (validate_email validate_email_domain_re)
|> Array.iter (validate_email validate_email_domain_re)
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