PURPOSE
Test that the format option can be used to define custom validation criteria.
AUTHOR
Toby Inkster <tobyink@cpan.org>.
COPYRIGHT AND LICENCE
Copyright 2011-2012 Toby Inkster.
This file is tri-licensed. It is available under the X11 (a.k.a. MIT) licence; you can also redistribute it and/or modify it under the same terms as Perl itself.