REBOL 3 Datatypes: Email!

Contents

Concept

An email address is a datatype. The email! datatype allows for easy expression of email addresses:

send luke@rebol.com {some message}

emails: [
    john@keats.dom
    lord@byron.dom
    edger@guest.dom
    alfred@tennyson.dom
]
mesg: {poetry reading at 8:00pm!}
foreach email emails [send email mesg]

Email is also one of the series datatypes, so the same rules that apply to series apply to emails:

probe head change/part jane@doe.dom "john" 4
john@doe.dom

Format

The standard format of an email address is a name, followed by an at sign (@), followed by a domain. An email address can be of any length, but must not include any of restricted characters, such as square brackets, quotes, braces, spaces, newlines, etc..

The following email! datatype formats are valid:

info@rebol.com
123@number-mail.org
my-name.here@an.example-domain.com

Upper and lower cases are preserved in email addresses.

Access

Refinements can be used with an email value to get the user name or domain. The refinements are:

• '/user - Get the user name.
• '/host - Get the domain.

Here's how these refinements work:

email: luke@rebol.com
probe email/user
luke

probe email/host
rebol.com

Creation

The to-email function converts data to the email! datatype:

probe to-email "info@rebol.com"
info@rebol.com

probe to-email [info rebol.com]
info@rebol.com

probe to-email [info rebol com]
info@rebol.com

probe to-email [user some long domain name out there dom]
user@some.long.domain.name.out.there.dom

Related

Use email? to determine whether a value is an email! datatype.

probe email? luke@rebol.com
true

As emails are part of the series! typeset, use series? to determine whether the value is a series:

probe series? luke@rebol.com
true

probe pick luke@rebol.com 5
#"@"