Regex Pick shortcode from html

gistfile1.txt

$pattern = '/(?(?=<\S*>)<\S*>|)\s*(\[[a-z|A-Z|-|\/|\s|\"|\=]*\])\s*(?(?=<\/\S*>)<\/\S*>|)/';

$html = '<p>
    [highlight type="note"]You and your confinement nanny are bound by the basic Work Permit conditions. For example, the nanny cannot work for other employers in an occupation other than that stated in the Work Permit.[/highlight]</p>';
  
  
$filtered = preg_replace($pattern, '$1', $html);

// Returns
/*
[highlight type="note"]You and your confinement nanny are bound by the basic Work Permit conditions. For example, the nanny cannot work for other employers in an occupation other than that stated in the Work Permit.[/highlight]

Now use WP shortcode parser to process it
*/