# phpman > perldoc > DateTime::Format::Builder::Parser::Dispatch

## NAME
    [DateTime::Format::Builder::Parser::Dispatch](https://www.chedong.com/phpMan.php/perldoc/DateTime%3A%3AFormat%3A%3ABuilder%3A%3AParser%3A%3ADispatch/markdown) - Dispatch parsers by group

## VERSION
    version 0.83

## SYNOPSIS
        package SampleDispatch;
        use [DateTime::Format::Builder](https://www.chedong.com/phpMan.php/perldoc/DateTime%3A%3AFormat%3A%3ABuilder/markdown) (
            parsers => {
                parse_datetime => [
                    {
                        Dispatch => sub {
                            return 'fnerk';
                        }
                    }
                ]
            },
            groups => {
                fnerk => [
                    {
                        regex  => qr/^(\d{4})(\d\d)(\d\d)$/,
                        params => [qw( year month day )],
                    },
                ]
            }
        );

## DESCRIPTION
    "Dispatch" adds another parser type to "Builder" permitting dispatch of parsing according to
    group names.

## SPECIFICATION
    "Dispatch" has just one key: "Dispatch". The value should be a reference to a subroutine that
    returns one of:

    *   "undef", meaning no groups could be found.

    *   An empty list, meaning no groups could be found.

    *   A single string, meaning: use this group

    *   A list of strings, meaning: use these groups in this order.

    Groups are specified much like the example in the SYNOPSIS. They follow the same format as when
    you specify them for methods.

## SIDE EFFECTS
    Your group parser can also be a Dispatch parser. Thus you could potentially end up with an
    infinitely recursive parser.

## SEE ALSO
    "<datetime@perl.org>" mailing list.

    <http://datetime.perl.org/>

    perl, DateTime, [DateTime::Format::Builder](https://www.chedong.com/phpMan.php/perldoc/DateTime%3A%3AFormat%3A%3ABuilder/markdown)

## SUPPORT
    Bugs may be submitted at <<https://github.com/houseabsolute/DateTime-Format-Builder/issues>>.

    I am also usually active on IRC as 'autarch' on "irc://irc.perl.org".

## SOURCE
    The source code repository for DateTime-Format-Builder can be found at
    <<https://github.com/houseabsolute/DateTime-Format-Builder>>.

## AUTHORS
    *   Dave Rolsky <<autarch@urth.org>>

    *   Iain Truskett <<spoon@cpan.org>>

## COPYRIGHT AND LICENSE
    This software is Copyright (c) 2020 by Dave Rolsky.

    This is free software, licensed under:

      The Artistic License 2.0 (GPL Compatible)

    The full text of the license can be found in the LICENSE file included with this distribution.