Method for escaping dot syntax

[golee]

In case of data array key has dot, the validator broke.

Example

$phpArray = [
  'google.com' => 'google',
  'youtube.com' => 'youtube'
];

$rules = [
  'required' => ['google.com', 'youtube.com']
];

$v = new \Valitron\Validator($phpArray);
$v->rules($rules);

echo $v->validate() ? "passed\n" : "failed\n";
print_r($v->errors());

Result

failed
Array
(
    [google.com] => Array
        (
            [0] => Google.com is required
        )

    [youtube.com] => Array
        (
            [0] => Youtube.com is required
        )

)

The reason validation failed is that valitron recognize google.com as array like ...

['google' => ['com' => null]]

So I need a method to distinguish between dot syntax and normal dot. Such as google\.com {google.com}