求一个正责表达式，我写的不知道为啥不行 打印$d 里包含]*>([\s\S]*)<\/dd>之间的类容

[xiachao2008]

        $a = '<dl class="info_l">
                    <dd class="__r_c_" pan="M14_Movie_Overview_BaseInfo"><strong>导演：</strong>
                        <a href="http://people.mtime.com/1654943/" target="_blank" rel="v:directedBy">杨庆</a>
                    </dd>
                    <dd  class="__r_c_" pan="M14_Movie_Overview_BaseInfo"><strong>编剧：</strong>
                        <a href="http://people.mtime.com/1654943/" target="_blank">杨庆</a>
                    </dd>
                    <dd  class="__r_c_" pan="M14_Movie_Overview_BaseInfo">
                        <strong>国家地区：</strong>
                            <a href="http://movie.mtime.com/movie/search/section/?nation=China" target="_blank">中国</a>
                    </dd>
                  <dd  class="__r_c_" pan="M14_Movie_Overview_BaseInfo">
                    <strong>发行公司：</strong>
                    <a href="http://movie.mtime.com/company/121271/" target="_blank">五洲电影发行有限公司</a>
                    <a href="http://movie.mtime.com/229813/details.html#company" target="_blank">...</a>
                  </dd>
                    <dt class="__r_c_" pan="M14_Movie_Overview_PlotsSummary">
                        <h4 class="px14 mt12">
                            剧情：</h4>
                        <p class="mt6 lh18">在布满防空洞的重庆，三个从初中就“厮混”在一起的好兄弟合伙开着一家火锅店，名为“老同学洞子火锅”。由于经营不善，几人落得只能转让店铺还债。为了店铺能“卖个好价钱”，三人打起了“扩充门面”的主意，自行往洞里开挖。没想到，..</p>
                            <p class="tr mt9"><a href="http://movie.mtime.com/229813/plots.html">更多剧情 <i class="gt"></i></a></p>
                    </dt>
            </dl>
';
        preg_match_all("<dd[^>]*>([\s\S]*)<\/dd>/isU",$a,$d);

        print_r($d);

[果酱很好吃]

preg_match_all("/<dd[^>]*>([\s\S]*?)<\/dd>/is",$a,$d);

[一起混吧]

正则没问题，只是少了起始分割符 preg_match_all("/<dd[^>]*>([\s\S]*)<\/dd>/isU",$a,$d);

[xuzuning]

$a = '<dl class="info_l">
                    <dd class="__r_c_" pan="M14_Movie_Overview_BaseInfo"><strong>导演：</strong>
                        <a href="http://people.mtime.com/1654943/" target="_blank" rel="v:directedBy">杨庆</a>
                    </dd>
                    <dd  class="__r_c_" pan="M14_Movie_Overview_BaseInfo"><strong>编剧：</strong>
                        <a href="http://people.mtime.com/1654943/" target="_blank">杨庆</a>
                    </dd>
                    <dd  class="__r_c_" pan="M14_Movie_Overview_BaseInfo">
                        <strong>国家地区：</strong>
                            <a href="http://movie.mtime.com/movie/search/section/?nation=China" target="_blank">中国</a>
                    </dd>
                  <dd  class="__r_c_" pan="M14_Movie_Overview_BaseInfo">
                    <strong>发行公司：</strong>
                    <a href="http://movie.mtime.com/company/121271/" target="_blank">五洲电影发行有限公司</a>
                    <a href="http://movie.mtime.com/229813/details.html#company" target="_blank">...</a>
                  </dd>
                    <dt class="__r_c_" pan="M14_Movie_Overview_PlotsSummary">
                        <h4 class="px14 mt12">
                            剧情：</h4>
                        <p class="mt6 lh18">在布满防空洞的重庆，三个从初中就“厮混”在一起的好兄弟合伙开着一家火锅店，名为“老同学洞子火锅”。由于经营不善，几人落得只能转让店铺还债。为了店铺能“卖个好价钱”，三人打起了“扩充门面”的主意，自行往洞里开挖。没想到，..</p>
                            <p class="tr mt9"><a href="http://movie.mtime.com/229813/plots.html">更多剧情 <i class="gt"></i></a></p>
                    </dt>
            </dl>
';
        preg_match_all("/<dd[^>]*>([\s\S]*)<\/dd>/isU",$a,$d);
 
        print_r($d[1]);

Array
(
    [0] => <strong>导演：</strong>
                        <a href="http://people.mtime.com/1654943/" target="_blank" rel="v:directedBy">杨庆</a>
                    
    [1] => <strong>编剧：</strong>
                        <a href="http://people.mtime.com/1654943/" target="_blank">杨庆</a>
                    
    [2] => 
                        <strong>国家地区：</strong>
                            <a href="http://movie.mtime.com/movie/search/section/?nation=China" target="_blank">中国</a>
                    
    [3] => 
                    <strong>发行公司：</strong>
                    <a href="http://movie.mtime.com/company/121271/" target="_blank">五洲电影发行有限公司</a>
                    <a href="http://movie.mtime.com/229813/details.html#company" target="_blank">...</a>
                  
)

preg_match_all("/<dd[^>]*>([\s\S]*)<\/dd>/isU",$a,$d);