$str = '<div class="float_l"><img class="linkImg lazy" src="/static/imghwm/default1.png" data-src="www.baidu.com" style="max-width:90%" link=abc" / alt="IMG_URL地址获取,正则解决思路" ></div>';<br />preg_match("/<img src=\"([^\"]+)\"/i", $str,$match);<br / alt="IMG_URL地址获取,正则解决思路" >var_dump($match[1]);