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package Input::Validator::Constraint::Email;
use strict;
use warnings;
use base 'Input::Validator::Constraint';
use constant NAME_MAX_LENGTH   => 64;
use constant DOMAIN_MAX_LENGTH => 255;
sub is_valid {
    my ($self, $value) = @_;
    return unless length $value <= NAME_MAX_LENGTH + 1 + DOMAIN_MAX_LENGTH;
    my ($name, $domain) = split /@/ => $value;
    return 0 unless defined $name && defined $domain;
    return 0 if $name eq '' || $domain eq '';
    return unless length $name <= NAME_MAX_LENGTH;
    return unless length $domain <= DOMAIN_MAX_LENGTH;
    my ($subdomain, $root) = split /\./ => $domain;
    return unless $subdomain && $root;
    return 1;
}
1;
__END__
HideShow 26 lines of Pod
=head1 NAME
Input::Validator::Constraint::Email - Email constraint
=head1 SYNOPSIS
    $validator->field('email')->email;
=head1 DESCRIPTION
Checks whether a value looks like an email address. This is a very simple yet
correct validation. It checks if an email has a correct length (name and domain) and
has at least one dot in the domain.
=head1 METHODS
=head2 C<is_valid>
Validates the constraint.
=head1 SEE ALSO
L<Input::Validator>, L<Input::Constraint>
=cut