<?php
$p = '/<img class="img lazy" src="/static/imghw/default1.png" data-src="http://usr.im/200x60?bg=3498DB&text=tool.lu" .*?src=[\'|\"](.+?)[\'|\"].*? alt="PHP提取页面第一张图为缩略图的代码" >/i';
preg_match_all($p,$str,$match);
print_r($match[1][0]);
?>
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<img class="img lazy" src="/static/imghw/default1.png" data-src="http://usr.im/200x60?bg=3498DB&text=tool.lu" alt="" />
结果为：http://usr.im/200x60?bg=3498DB&text=tool.lu
<img class="img lazy" src="/static/imghw/default1.png" data-src="http://img.mukewang.com/user/55c877240001291602790279-80-80.jpg" alt="" />
结果为：http://img.mukewang.com/user/55c877240001291602790279-80-80.jpg
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