如何使用preg_match从两个HTML Div中获取数据？

Question

我正在尝试在这两个div之间获取数据：

--<div id="p_tab4" class="p_desc" style="display: block;">
--<div id="p_top_cats" class="p_top_cats">

我正在使用下面的正则表达式，但是并没有给我任何东西：

/<div id=\"p_tab4\" class=\"p_desc\" style=\"display: block;\">(.*?)<div id=\"p_top_cats\" class=\"p_top_cats\">/

我如何更正此正则表达式？

Answer 1

似乎您的正则表达式没有问题，但是您需要打开点播模式s，以便正则表达式中的点也将与换行符（

换行符匹配。]

~<div id=\"p_tab4\" class=\"p_desc\" style=\"display: block;\">(.*?)<div id=\"p_top_cats\" class=\"p_top_cats\">~s

代码：
$re = '~<div id=\"p_tab4\" class=\"p_desc\" style=\"display: block;\">(.*?)<div id=\"p_top_cats\" class=\"p_top_cats\">~s';
$str = "--<div id=\"p_tab4\" class=\"p_desc\" style=\"display: block;\">\n--<div id=\"p_top_cats\" class=\"p_top_cats\">";
preg_match($re, $str, $matches);
echo $matches[1];

DEMO

Answer 2

假设您的HTML格式正确，如下所示：

<div id="p_tab4" class="p_desc" style="display: block;">...</div>
some stuff in between
<div id="p_top_cats" class="p_top_cats">
</div>

您可以使用DOMDocument和XPath：
$html = <<<'EOS'
<div id="p_tab4" class="p_desc" style="display: block;">
some stuff in between
<div id="p_top_cats" class="p_top_cats">
</div>
</div>
EOS;

$doc = new DOMDocument;
$doc->loadHTML($html);
$xpath = new DOMXPath($doc);

$query = '//node()[preceding-sibling::div[@id="p_tab4"] and following-sibling::div[@id="p_top_cats"]]';

foreach ($xpath->query($query) as $node) {
    echo $node->textContent, PHP_EOL;
}