framework/validators/EmailValidator.php
public function getClientOptions($model, $attribute)
    {
        $options = [
            'pattern' => new JsExpression($this->pattern),
            'fullPattern' => new JsExpression($this->fullPattern),
            'allowName' => $this->allowName,
            'message' => $this->formatMessage($this->message, [
                'attribute' => $model->getAttributeLabel($attribute),
            ]),
            'enableIDN' => (bool) $this->enableIDN,
        ];
        if ($this->skipOnEmpty) {
            $options['skipOnEmpty'] = 1;
        }

        return $options;
    }
public function getClientOptions($model, $attribute)
    {
        $options = [
            'pattern' => new JsExpression($this->pattern),
            'fullPattern' => new JsExpression($this->fullPattern),
            'allowName' => $this->allowName,
            'message' => $this->formatMessage($this->message, [
                'attribute' => $model->getAttributeLabel($attribute),
            ]),
            'enableIDN' => (bool) $this->enableIDN,
        ];
        if ($this->skipOnEmpty) {
            $options['skipOnEmpty'] = 1;
        }

        return $options;
    }
{@inheritdoc}