Magento 2 – How to Use Pattern Validation

I'm using a plugin to validate the street field (based on https://magento.stackexchange.com/a/158101/28803) and I want to use the validation method 'pattern' to test for the following regex:

.*[0-9].*

Complete code:

“`

public function afterProcess(
    \Magento\Checkout\Block\Checkout\LayoutProcessor $subject,
    array  $jsLayout
) {
    $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']['children']
    ['shippingAddress']['children']['shipping-address-fieldset']['children']['street'] = [
        'component' => 'Magento_Ui/js/form/components/group',
        'label' => __('Street Address'),
        'required' => true,
        'dataScope' => 'shippingAddress.street',
        'provider' => 'checkoutProvider',
        'sortOrder' => 60,
        'type' => 'group',
        'additionalClasses' => 'street',
        'children' => [
            [
                'component' => 'Magento_Ui/js/form/element/abstract',
                'config' => [
                    'customScope' => 'shippingAddress',
                    'template' => 'ui/form/field',
                    'elementTmpl' => 'ui/form/element/input'
                ],
                'dataScope' => '0',
                'provider' => 'checkoutProvider',
                'validation' => ['required-entry' => true, 'pattern' => '.*[0-9].*'],
            ],
            [
                'component' => 'Magento_Ui/js/form/element/abstract',
                'config' => [
                    'customScope' => 'shippingAddress',
                    'template' => 'ui/form/field',
                    'elementTmpl' => 'ui/form/element/input'
                ],
                'dataScope' => '1',
                'provider' => 'checkoutProvider',
                'validation' => ['required-entry' => true, 'pattern' => ".*[0-9].*"],
            ]
        ]
    ];
    return $jsLayout;
}

}
“`

However validation' => ['required-entry' => true, 'pattern' => ".*[0-9].*"], doesn't work (it generates a blank page on checkout). What am I doing wrong?

I'm using Magento 2.1.2 with vagrant.