正则表达式的问题

$ptn="/<tr +bgcolor=\"#ffffff\">.*?<\/tr>/is";
$str=preg_replace($ptn,"",$str);

解决方案 »

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$ptn="/<tr +bgcolor=\"#ffffff\">[\s\S]*<\/tr>/is";
$str=preg_replace($ptn,"",$str);试试呢？
好像"."不匹配回车什么的
$search = "/<tr(.*?)<iframe (.*?)<\/tr>/is";
preg_replace($search,'------------',$str);
$search = "/<tr(.*?)<iframe (.*?)<\/tr>/is";
$y =  preg_replace($search,'',$str);
<?php
$str = '<html>
<head/>
<body>
<table   width="520"   cellspacing="1"   cellpadding="5"   border="0"   bgcolor="#cccccc"   align="center"   bordercolordark="#ffffff">
<tbody>
<tr   bgcolor="#e9f8d7">
<td   align="center"   colspan="4"> 身份证号码查询解读、验证和升级结果 </td>
</tr>
<tr   bgcolor="#ffffff">
<td   colspan="4">
<script   type="text/javascript">
</script>
<script   src="http://images.sohu.com/cs/jsfile/js/cpc.js"   type="text/javascript"   language="JavaScript">
</script>
<iframe   width="468"   scrolling="no"   height="42"   frameborder="0"   src="http://sogou.com/cpc_ads?pid=123cha&fmt=h_468_60&iw=468&ih=42&charset=gb2312&c_bo=FFFFFF&c_bg=FFFFFF&c_li=0055E5&c_te=000000&c_bt=000000&c_hl=FF0900&sv=0&sl=1&hl=0&tnt=0&sohuurl=http://localhost/index_test.php"   allowtransparency="true"   marginheight="0"   marginwidth="0">
</iframe>
</td>
</tr>
<tr>
<td   width="120"   bgcolor="#f6f6f6"   align="center"> 出生日期 </td>
<td   width="240"   bgcolor="#ffffff"   align="center"> 1982   年   02   月   13   日 </td>
<td   width="80"   bgcolor="#f6f6f6"   align="center"> 性别 </td>
<td   width="80"   bgcolor="#ffffff"   align="center"> 男 </td>
</tr>
<tr>
</tr>
<tr>
</tr>
<tr>
</tr>
<tr>
</tr>
<tr>
</tr>
<tr   height="28">
</tr>
</tbody>
</table>
</body>
</html> ';
$search = "/<tr(.*?)<iframe (.*?)<\/tr>/is";
$result =  preg_replace($search,'',$str);
echo htmlspecialchars($result);?>
<?php
$handle = fopen("http://www.123cha.com/idcard/352601198202134013/", "rb");
$contents = stream_get_contents($handle);$contents = eregi_replace(".*<table id=\"tb\"", "<table", $contents);
$contents = eregi_replace("</table>.*", "", $contents);
//$contents = eregi_replace("<tr +bgcolor=\"#ffffff\">(.*?)<\/iframe><\/td><\/tr>", "", $contents);
//$ptn = "/<tr +bgcolor=\"#ffffff\">(.*?)<\/iframe><\/td><\/tr>/is";
//$contents=preg_replace($ptn,"",$contents);
echo $contents;
?>
可能是我没说清楚，不好意思，我会适当加分
代码如上，我要去掉那个广告