https://github.com/auraphp/Aura.Filter/blob/2.x/docs/custom.md
こちらのカスタムルールを追加するためのModuleです。
$config = require dirname(dirname(__DIR__)) . '/var/conf/validate.php';
$this->install(new ExtraAuraFilterModule($config));
$config = [
'mbstrlen-max' => \Satomif\ExtraAuraFilterModule\Filter\MbStrlenMax::class
];
return $config;
use ValidationInject;
$mbString = 'こんにちは!世界2!';
$this->filter->validate('var_name')->is('mbstrlen-max', 9);
$data = ['var_name' => $mbString];
$fail = $this->filter->apply($data);
if (! $fail) {
$msgs = (string) $this->errorString;
}