$re = '/.+[\/-](.+)\.png/m';
$str = 'https://stardewvalleywiki.com/mediawiki/images/thumb/b/b1/Dandelion.png/24px-Dandelion.png
https://stardewvalleywiki.com/mediawiki/images/8/8a/Spring_Foraging_Bundle.png
https://stardewvalleywiki.com/mediawiki/images/thumb/9/94/Speed-Gro.png/24px-Speed-Gro.png';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php