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Zotonic standard library

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zotonic_stdlib src z_email_utils.erl
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src/z_email_utils.erl 

%% @author Marc Worrell

%% @copyright 2013 Marc Worrell

%% @doc Useful routines for e-mail address handling.



%% Copyright 2013 Marc Worrell

%%

%% Licensed under the Apache License, Version 2.0 (the "License");

%% you may not use this file except in compliance with the License.

%% You may obtain a copy of the License at

%%

%%     http://www.apache.org/licenses/LICENSE-2.0

%%

%% Unless required by applicable law or agreed to in writing, software

%% distributed under the License is distributed on an "AS IS" BASIS,

%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

%% See the License for the specific language governing permissions and

%% limitations under the License.



-module(z_email_utils).



-author("Marc Worrell <marc@worrell.nl>").



-export([

	is_email/1,

	extract_emails/1

]).





%% @doc Check if the argument is an e-mail address (without any extras like name, comments, etc.)

-spec is_email(iodata()) -> boolean().

is_email(Email) ->

    case re:run(Email, [$^|re()]++"$", [extended]) of

        nomatch   -> false;

        {match,_} -> true

    end.





%% @doc Extract e-mail addresses from a text. All e-mail addresses are lower cased, doubles are removed.

-spec extract_emails(iodata()) -> [ binary() ].

extract_emails(Text) ->

	Text1 = iolist_to_binary([32, Text, 32]),

	Re = "[^a-zA-Z0-9\\.@\\-\\+]("++re()++")",

    case re:run(Text1, Re, [extended, global, {capture, all, binary}]) of

        nomatch ->

        	[];

        {match, Match} ->

            lists:usort([ z_string:to_lower(E) || [_,E|_] <- Match ])

    end.





%% @doc Regular expression to match e-mail addresses.

re() ->

    "(

            (\"[^\"\\f\\n\\r\\t\\v\\b]+\")

        |   ([\\w\\!\\#\\$\\%\\&\\'\\*\\+\\-\\~\\/\\^\\`\\|\\{\\}]+

                (\\.[\\w\\!\\#\\$\\%\\&\\'\\*\\+\\-\\~\\/\\^\\`\\|\\{\\}]+)*

            )

    )

    @

    (

        (

            ([A-Za-z0-9\\-])+\\.

        )+

        [A-Za-z\\-]{2,}

    )".