$validator = new \Sirius\Validation\Validator;

// add a validation rule
$validator->add('title', 'required');

// add a rule that has a list of options
$validator->add('title', 'length', array('min' => 10, 'max' => 100));
// or use JSON
$validator->add('title', 'length', '{"min": 10, "max": 100}');
// or a URL query string
$validator->add('title', 'length', 'min=10&max=100');
// or, if you know that the validator can CORECTLY parse (ie: understand) the options string
$validator->add('title', 'length', '10,100');

// add a rule with a custom error message
$validator->add('title', 'maxlength', 'max=100', 'Article title must have less than {max} characters');

// add a rule with a custom message and a label (very handy with forms)
$validator->add('title:Title', 'maxlength', 'max=100', '{label} must have less than {max} characters');

// add multiple rules at once (separate using [space][pipe][space])
$validator->add('title:Title', 'required | maxlength(255) | minlength(min=10)');

// add all your rules at once
$validator->add([
        'title:Title' => 'required | maxlength(100)',
        'content:Content' => 'required',
        'source:Source' => 'website'
    ], [
        'content.required' => 'The content field should have a velue'
    ]);

// add nested rules
$validator->add('recipients[*]:Recipients', 'email'); //all recipients must be valid email addresses
$validator->add('shipping_address[city]:City', 'MyApp\Validator\City'); // uses a custom validator to validate the shipping city