my %validate = (
        int  => sub { my($v)=@_; $v=~/^[0-9]+$/; },
        date => sub { my($v)=@_; $v=~/^[12]\d\d\d\-[01]?\d\-[0123]?\d/; },
);

foreach my $value (qw [ 24 140 510 2001-04-14 3014-30-55 ])
{
        print "$value\n";
        foreach my $type (sort keys %validate)
        {
                print "\tIs '$type'\n" if ($validate{$type}($value));
        }
}

##</code><code>##

$validate{$new_type}
     = eval "sub { my(\$v)=\@_; \$v=~$regex; }";