preg_match_all | U | is 正则匹配url
$str= <<<EOF
<div class="page-content clear" style="margin-top:5px" >
<div class="chlsnav">
<div class="btt">zz列表</div>
<a href="/a/DFMV"><div class="plst"><b>东方电影zz</b></div></a><div class="pbar"><b>zz</b></div><ul class="r" ><li><b>东方卫视</b><span></span></li><li><a href="/a/b-TOONMAX1-w4.html">炫动卡通卫视</a><span></span></li><li><a href="/a/b-b1-w4.html">新闻</a><span></span></li><li><a href="/a/b-b2-w4.html">第一财经</a><span></span></li><li><a href="/a/b-b3-w4.html">星尚</a><span></span></li><li><a href="/a/b-b4-w4.html">电视剧</a><span></span></li><li><a href="/a/b-b5-w4.html">体育</a><span></span></li><li><a href="/a/b-b6-w4.html">纪实</a><span></span></li><li><a href="/a/b-b7-w4.html">娱乐</a><span></span></li><li><a href="/a/b-b8-w4.html">艺术人文</a><span></span></li><li><a href="/a/b-b9-w4.html">外语</a><span></span></li><li><a href="/a/b-b10-w4.html">东方购物</a><span></span></li><li><a href="/a/b-b11-w4.html">哈哈少儿</a><span></span></li></ul><a href="/a/SHEDU"><div class="plst"><b>教育zz</b></div></a><a href='/a/SITV'><div class='plst'><b>SITVzz</b></div></a>
</div>
EOF;
$reg = '/<a(.*)href=[\"\'](.*)[\"\'][^>]*><div class=\"plst\"><b>(.*)<\/b><\/div><\/a>/U';
$reg = '/<a[^href]*href=[\"\']([^\"|\']*)[\"\'][^>]*><div class=[\"\']plst[\"\']><b>(.*?)<\/b><\/div><\/a>/is';
//$reg = '/<a[^href]*href="([^"]+)"[^>]*><div class=\"plst\"><b>(.*?)<\/b><\/div><\/a>/is';
//$reg = "|<a href=\"([^>]+)\"><div class=\"plst\"><b>(.*?)</b></div></a>|is";
preg_match_all($reg, $str, $match);
print_r($match);
//preg_match('/.+(<a.+?class="plst".+?a>)/is', $str, $match);
//$reg = "/<a(.*)href=[\"\'](.*)[\"\']><div class=\"plst\"><b>(.*)<\/b><\/div><\/a>/isU";
//$reg = "|<a href=\"([^>]+)\"><div class=\"plst\"><b>(.*?)</b></div></a>|U";
exit;
