请问怎么用正则式匹配指定的<div>

Question

假如有这样一段代码：<div class="a" id="a"><img src="a.gif"><div class="b"><h1>bbb</h1></div></div><div class="c">ccc</div>请问要想得到<div class="a" id="a"><img src="a.gif"><div class="b"><h1>bbb</h1></div></div>正则式应该怎样写呢？

Answer 1

(?is)<div \s?.*>.*\s?<div\s?.*>.*\s?</div></div>

Answer 2

 var reg = /<div \s?.*>.*\s?<div\s?.*>.*\s?<\/div><\/div>/gi;
        alert(reg.exec("<div class=\"a\" id=\"a\"><img src=\"a.gif\"><div class=\"b\"><h1>bbb</h1></div></div><div class=\"c\">ccc</div>"));