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Perl Perl6
branch: master

qcontent could be empty in quoted-string

so "" is valid too.

rfc says:

    quoted-string   =       [CFWS]
                        DQUOTE *([FWS] qcontent) [FWS] DQUOTE
                        [CFWS]
latest commit 6a42da3fac
@sunnavy sunnavy authored

README

NAME
    Email::Address::List - RFC close address list parsing

SYNOPSIS
        use Email::Address::List;

        my $header = <<'END';
        Foo Bar <simple@example.com>, (an obsolete comment),,,
         a group:
          a . weird . address @
          for-real .biz
         ; invalid thingy, <
         more@example.com
         >
        END

        my @list = Email::Address::List->parse($header);
        foreach my $e ( @list ) {
            if ($e->{'type'} eq 'mailbox') {
                print "an address: ", $e->{'value'}->format ,"\n";
            }
            else {
                print $e->{'type'}, "\n"
            }
        }

        # prints:
        # an address: "Foo Bar" <simple@example.com>
        # comment
        # group start
        # an address: a.weird.address@forreal.biz
        # group end
        # unknown
        # an address: more@example.com

DESCRIPTION
    Parser for From, To, Cc, Bcc, Reply-To, Sender and previous prefixed
    with Resent- (eg Resent-From) headers.

REASONING
    Email::Address is good at parsing addresses out of any text even
    mentioned headers and this module is derived work from Email::Address.

    However, mentioned headers are structured and contain lists of
    addresses. Most of the time you want to parse such field from start to
    end keeping everything even if it's an invalid input.

METHODS
  parse
    A class method that takes a header value (w/o name and :) and a set of
    named options, for example:

        my @list = Email::Address::List->parse( $line, option => 1 );

    Returns list of hashes. Each hash at least has 'type' key that describes
    the entry. Types:

    mailbox
        A mailbox entry with Email::Address object under value key.

        If mailbox has obsolete parts then 'obsolete' is true.

        If address (not display-name/phrase or comments, but
        local-part@domain) contains not ASCII chars then 'not_ascii' is set
        to true. According to RFC 5322 not ASCII chars are not allowed
        within mailbox. However, there are no big problems if those are used
        and actually RFC 6532 extends a few rules from 5322 with
        UTF8-non-ascii. Either use the feature or just skip such addresses
        with skip_not_ascii option.

    group start
        Some headers with mailboxes may contain groupped addresses. This
        element is returned for position where group starts. Under value key
        you find name of the group. NOTE that value is not post processed at
        the moment, so it may contain spaces, comments, quoted strings and
        other noise. Author willing to take patches and warns that this will
        be changed at some point without additional notifications, so if you
        need groups info then you better send a patch :)

        Groups can not be nested, but one field may have multiple groups or
        mix of addresses that are in a group and not in any.

        See skip_groups option.

    group end
        Returned when a group ends.

    comment
        Obsolete syntax allows one to use standalone comments between
        mailboxes that can not be addressed to any mailbox. In such
        situations a comment returned as an entry of this type. Comment
        itself is under value.

    unknown
        Returned if parser met something that shouldn't be there. Parser
        tries to recover by jumping over to next comma (or semicolon if
        inside group) that is out quoted string or comment, so "foo, bar,
        baz" string results in three unknown entries. Jumping over comments
        and quoted strings means that parser is very sensitive to unbalanced
        quotes and parens, but it's on purpose.

    It can be controlled which elements are skipped, for example:

        Email::Address::List->parse($line, skip_unknown => 1, ...);

    skip_comments
        Skips comments between mailboxes. Comments inside and next to a
        mailbox are not skipped, but returned as part of mailbox entry.

    skip_not_ascii
        Skips mailboxes where address part has not ASCII characters.

    skip_groups
        Skips group starts and end elements, however emails within groups
        are still returned.

    skip_unknown
        Skip anything that is not recognizable. It still tries to recover as
        described earlier.

AUTHOR
    Ruslan Zakirov <ruz@bestpractical.com>

LICENSE
    Under the same terms as Perl itself.

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