$filter public property Additional filter to be applied to the DB query used to check the existence of the attribute value. This can be a string or an array representing the additional query condition (refer to yii\db\Query::where() on the format of query condition), or an anonymous function with the signature function ($query), where $query is the Query object that you can modify in the function. public string|array|Closure $filter = null

$allowArray public property Whether to allow array type attribute. public boolean $allowArray = false

validateValue() protected method Validates a value. A validator class can implement this method to support data validation out of the context of a data model. protected array|null validateValue ( $value )$value mixed The data value to be validated. return array|null The error message and the parameters to be inserted into the error message. Null should be returned if the data is valid. throws yii\base\NotSupportedException if the validator does not supporting data validation withou

init() public method Initializes the object. This method is invoked at the end of the constructor after the object is initialized with the given configuration. public void init ( )

clientValidateAttribute() public method Returns the JavaScript needed for performing client-side validation. You may override this method to return the JavaScript validation code if the validator can support client-side validation. The following JavaScript variables are predefined and can be used in the validation code: attribute: an object describing the the attribute being validated. value: the value being validated. messages: an array used to hold the validation error messages for the

$pattern public property The regular expression used to validate the attribute value. See also http://www.regular-expressions.info/email.html. public string $pattern = '/^[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?$/'

$fullPattern public property The regular expression used to validate email addresses with the name part. This property is used only when $allowName is true. See also $allowName. public string $fullPattern = '/^[^@]*<[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?>$/'

$enableIDN public property Whether validation process should take into account IDN (internationalized domain names). Defaults to false meaning that validation of emails containing IDN will always fail. Note that in order to use IDN validation you have to install and enable intl PHP extension, otherwise an exception would be thrown. public boolean $enableIDN = false

$checkDNS public property Whether to check whether the email's domain exists and has either an A or MX record. Be aware that this check can fail due to temporary DNS problems even if the email address is valid and an email would be deliverable. Defaults to false. public boolean $checkDNS = false

$allowName public property Whether to allow name in the email address (e.g. "John Smith john.smith@example.com"). Defaults to false. See also $fullPattern. public boolean $allowName = false