Regex从HTML移除带有样式标签的图像 [英] Regex Remove Images with style tag from Html
问题描述
我是Regex的新手，但是我认为这是实现所需操作的最简单方法.基本上，我有一个字符串(在PHP中)，其中包含整个HTML代码负载...我想删除所有具有style = display:none ...
I am new to Regex, however I decided it was the easiest route to what I needed to do. Basically I have a string (in PHP) which contains a whole load of HTML code... I want to remove any tags which have style=display:none...
例如
<img src="" style="display:none" />
<img src="" style="width:11px;display: none" >
等...
到目前为止，我的正则表达式是:
So far my Regex is:
<img.*style=.*display.*:.*none;.* >
但是，这似乎遗留了html的某些内容，并且当在带preg_replace的php中使用时，还会删除下一个元素.
But that seems to leave bits of html behind and also take the next element away when used in php with preg_replace.
推荐答案
Like Michael pointed out, you don't want to use Regex for this purpose. A Regex does not know what an element tag is. <foo> is as meaningful as >foo< unless you teach it the difference. Teaching the difference is incredibly tedious though.
DOM非常方便:
$html = <<< HTML
<img src="" style="display:none" />
<IMG src="" style="width:11px;display: none" >
<img src="" style="width:11px" >
HTML;
以上是我们的(无效)标记.我们像这样将其提供给DOM:
The above is our (invalid) markup. We feed it to DOM like this:
$dom = new DOMDocument();
$dom->loadHtml($html);
$dom->normalizeDocument();
现在，我们在DOM中查询包含样式"属性的所有"IMG"元素，其中样式"属性包含文本显示".我们可以在XPath中查询"display:none"，但是我们的输入标记出现了，中间没有空格:
Now we query the DOM for all "IMG" elements containing a "style" attribute that contains the text "display". We could query for "display: none" in the XPath, but our input markup has occurences with no space inbetween:
$xpath = new DOMXPath($dom);
foreach($xpath->query('//img[contains(@style, "display")]') as $node) {
$style = str_replace(' ', '', $node->getAttribute('style'));
if(strpos($style, 'display:none') !== FALSE) {
$node->parentNode->removeChild($node);
}
}
我们遍历IMG节点，并从其样式属性内容中删除所有空格.然后，我们检查它是否包含"display:none"，如果是，则从DOM中删除该元素.
We iterate over the IMG nodes and remove all whitespace from their style attribute content. Then we check if it contains "display:none" and if so, remove the element from the DOM.
现在我们只需要保存HTML:
Now we only need to save our HTML:
echo $dom->saveHTML();
给予我们
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body><img src="" style="width:11px"></body></html>
螺丝正则表达式！
Addendum: you might also be interested in Parsing XML documents with CSS selectors
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