define("REGEXP_MULTIPLE_NAMES", "/^[a-zA-Zs-]+$/i");

//Expression to check Dutch phone numbers. Number must start with zero and number of digits should be 10. Different area and country codes are allowed.
define("REGEXP_PHONE_NL", "/(^+[0-9]{2}|^+[0-9]{2}(0)|^(+[0-9]{2})(0)|^00[0-9]{2}|^0)([0-9]{9}$|[0-9-s]{10}$)/");

$data = array(
    'city' => 'The hague',
    'telephonenr' => '0701234567'
);
$args = array(
    'city' => array(
        'filter' => FILTER_VALIDATE_REGEXP,
        array(
            "options" => array(
                "regexp" => REGEXP_MULTIPLE_NAMES
            )
        )
    ),
    'telephonenr' => array(
        'filter' => FILTER_VALIDATE_REGEXP,
        array(
            'options' => array(
                "regexp" => REGEXP_PHONE_NL
            )
        )
    )
);

$myinputs = filter_var_array($data, $args);
print_r($myinputs);

$args = array(
'city' => array(
    'filter' => FILTER_VALIDATE_REGEXP,
    'options' => array(
        "regexp" => REGEXP_MULTIPLE_NAMES
    )
),
'telephonenr' => array(
    'filter' => FILTER_VALIDATE_REGEXP,
    'options' => array(
        "regexp" => REGEXP_PHONE_NL
    )
  )
);