php - html标签之间的PHP preg_match图像

Question

我有一个这样的html模板：

    <div class="cont">
    <div class="...">
    <p>...<p>
    <img alt="" class="popup" src="DESIRED IMAGE LINK" style="..." /></p><p>...</p>
    ....

我想在“”标签中提取“DESIRED IMAGE LINK”，目前我正在使用这个：

$pattern = '<div class="cont">.*?src=["\']?([^"\']?.*?(png|jpg|jpeg|gif))["\']?/i';
if (preg_match($pattern, $content, $image))
     .....

但它不起作用，错误是：

    warning: preg_match() [function.preg-match]: Unknown modifier '.' 

我该如何解决？谢谢

Answer 1

答案是，不要使用正则表达式。

$contents = <<<EOS
<div class="cont">
    <div class="...">
    <p>...<p>
    <img alt="" class="popup" src="DESIRED IMAGE LINK" style="..." /></p><p>...</p>
EOS;

$doc = new DOMDocument;
libxml_use_internal_errors(true);
$doc->loadHTML($contents);
libxml_clear_errors();

$xp = new DOMXPath($doc);

// get first image inside div.cont
foreach($xp->query('//div[@class="cont"]//img[1]') as $node) {
        // output the src attribute
        echo $node->getAttribute('src'), PHP_EOL;
}

参见：DOMDocument DOMXPath

Answer 2

If you're planning on parsing html try using DOM with xpath.

Answer 3

$pattern = '/<div class="cont">.*?src=["\']?([^"\']?.*?(png|jpg|jpeg|gif))["\']?/i

您缺少前导分隔符/。