Sokil\Mongo\Expression::whereLike PHP Method

    public function whereLike($field, $regex, $caseInsensitive = true)
    {
        // regex
        $expression = array('$regex' => $regex);
        // options
        $options = '';
        if ($caseInsensitive) {
            $options .= 'i';
        }
        $expression['$options'] = $options;
        // query
        return $this->where($field, $expression);
    }