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<?php
$str = '<iframe data-src="https://v.qq.com/iframe/preview.html?vid=d0524jysj5w&width=500&height=375&auto=0"> ';
echo '<pre>';
echo (preg_replace('/<iframe.*?data-src=".+?vid=([^&"]+).+?".*?>/', '<iframe src="https://v.qq.com/iframe/player.html?vid=\1">', $str));
echo '</pre>';
?>
<?php
$str = '<iframe data-src="https://v.qq.com/iframe/preview.html?vid=d0524jysj5w"> ';
echo '<pre>';
print_r(preg_replace('/<iframe.*?data-src=".+?vid=(.+?)".*?>/', '<iframe src="https://v.qq.com/iframe/player.html?vid=\1">', $str));
echo '</pre>';
?>