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    Email::Valid->rfc822($value);
  return '';
}

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=head2 date

Returns I<invalid> if the field value seems to be incompatible to
common date formats or the date doesn't exist in the Gregorian
calendar.  The following formats are allowed:

dd.mm.yyyy dd-mm-yyyy dd/mm/yyyy yyyy-mm-dd yyyy/mm/dd yyyy.mm.dd

The C<check_date> method of the I<Date::Pcalc> package is used to
prove the dates existence.

=cut

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