How to get the SRC previous and next images for use in image.php?

Trying to remove the image from the function previous_image_link () directly through the arguments of this function I do this is not possible. Therefore, try to simply extract the SRC:

<td style="background: url(

<?php

    $html = previous_image_link('full');
    preg_match_all('/<img [^>]*src=["|\']([^"|\']+)/i', $html, $matches);
    foreach ($matches[1] as $key=>$value) {
        echo $value;
    }
?>

) no-repeat center center; background-size: cover;">

However, instead of the expected

<td style="background: url(/wp-content/uploads/2015/03/tiaurus.info_20150323125918.jpg") no-repeat center center; background-size: cover;">

getting

<td height="3166" class="attachment-full" alt="img_alt_text" src="/wp-content/blablabla/20150323125918.jpg" 8176"="">) no-repeat center center;background-size: cover;"&gt;
            </td>
) no-repeat center center;background-size: cover;">

As in my case it is necessary to use preg_match_all?

Or can someone tell me how to get the SRC previous and next images for use in image.php?