正则截取html中的一段
<br /> <html><br /> <body><br /> .........<br /> .........<br /> <ul class="style5"><br /> <li><a href="/profiles/83291221"><img src="/images/252754752" alt="标题标题" />标题标题</a></li><br /> <li><a href="/profiles/83291221"><img src="/images/252754752" alt="标题标题" />标题标题</a></li><br /> <li><a href="/profiles/83291221"><img src="/images/252754752" alt="标题标题" />标题标题</a></li><br /> </ul><br /> ........<br /> ........<br /> <br /> </body><br /> <br /> </html><br /> <br /> <br />