- preg_match: documentation ( source)
- print_r: documentation ( source)
<?php
$content = '<a href="http://www.amazon.com/dp/B004JKDN3I/?tag=longshan07-20" target="_blank">Amazon</a>上目前价格降至$160.59';
preg_match('@".*?/(dp|product)/(.*?)(/|%3F|\?)"@',$content,$m);
print_r($m);