Regex/DOMDocument-匹配并替换不在链接中的文本

这里有一个UTF-8安全的解决方案,它不仅适用于格式正确的文档,也适用于文档片段。

需要mb_convert_编码,因为loadHtml()似乎有UTF-8编码的错误(请参见 here 和 here ).

<?php
$html = '<p>Match this text and replace it</p>
<p>Don\'t <a href="/">match this text</a></p>
<p>We still need to match this text and replace itŐŰ</p>
<p>This is <a href="#">a link <span>with <strong>don\'t match this text</strong> content</span></a></p>';

$dom = new DOMDocument();
// loadXml needs properly formatted documents, so it's better to use loadHtml, but it needs a hack to properly handle UTF-8 encoding
$dom->loadHtml(mb_convert_encoding($html, 'HTML-ENTITIES', "UTF-8"));

$xpath = new DOMXPath($dom);

foreach($xpath->query('//text()[not(ancestor::a)]') as $node)
{
    $replaced = str_ireplace('match this text', 'MATCH', $node->wholeText);
    $newNode  = $dom->createDocumentFragment();
    $newNode->appendXML($replaced);
    $node->parentNode->replaceChild($newNode, $node);
}

// get only the body tag with its contents, then trim the body tag itself to get only the original content
echo mb_substr($dom->saveXML($xpath->query('//body')->item(0)), 6, -7, "UTF-8");

参考文献:
1. find and replace keywords by hyperlinks in an html fragment, via php dom
2. Regex / DOMDocument - match and replace text not in a link
3. php problem with russian language
4. Why Does DOM Change Encoding?

我读了很多关于这个主题的答案,所以如果我忘记了某个人,我很抱歉(请评论一下,在这个例子中我也会加上你的答案)。

感谢戈登,感谢他继续评论 my other answer .

$dom = new DOMDocument;
$dom->loadHTML($html_content);

function preg_replace_dom($regex, $replacement, DOMNode $dom, array $excludeParents = array()) {
  if (!empty($dom->childNodes)) {
    foreach ($dom->childNodes as $node) {
      if ($node instanceof DOMText && 
          !in_array($node->parentNode->nodeName, $excludeParents)) 
      {
        $node->nodeValue = preg_replace($regex, $replacement, $node->nodeValue);
      } 
      else
      {
        preg_replace_dom($regex, $replacement, $node, $excludeParents);
      }
    }
  }
}

preg_replace_dom('/match this text/i', 'IT WORKS', $dom->documentElement, array('a'));

这是使用DOM树的预顺序遍历的无堆栈非递归方法。

  libxml_use_internal_errors(TRUE);
  $dom=new DOMDocument('1.0','UTF-8');

  $dom->substituteEntities=FALSE;
  $dom->recover=TRUE;
  $dom->strictErrorChecking=FALSE;

  $dom->loadHTMLFile($file);
  $root=$dom->documentElement;
  $node=$root;
  $flag=FALSE;
  for (;;) {
      if (!$flag) {
          if ($node->nodeType==XML_TEXT_NODE &&
              $node->parentNode->tagName!='a') {
              $node->nodeValue=preg_replace(
                  '/match this text/is',
                  $replacement, $node->nodeValue
              );
          }
          if ($node->firstChild) {
              $node=$node->firstChild;
              continue;
          }
     }
     if ($node->isSameNode($root)) break;
     if ($flag=$node->nextSibling)
          $node=$node->nextSibling;
     else
          $node=$node->parentNode;
 }
 echo $dom->saveHTML();

libxml_use_internal_errors(TRUE); 后面的三行代码 $dom=new DOMDocument; 应该能够处理任何格式错误的HTML。

$a='<p>Match this text and replace it</p>
<p>Don\'t <a href="/">match this text</a></p>
<p>We still need to match this text and replace it</p>';

echo preg_replace('~match this text(?![^<]*</a>)~i','replacement',$a);

负lookahead确保只有在下一个标记不是关闭链接时才进行替换。它可以很好地与你的例子,虽然它不会工作,如果你碰巧使用其他标签在你的链接。

你可以用 PHP Simple HTML DOM Parser 下面是与 Netcoder's DomDocument solution

function replaceWithSimpleHtmlDom($html_content, $search, $replace, $excludedParents = array()) {
    require_once('simple_html_dom.php');
    $html = str_get_html($html_content);
    foreach ($html->find('text') as $element) {
        if (!in_array($element->parent()->tag, $excludedParents))
            $element->innertext = str_ireplace($search, $replace, $element->innertext);
    }
    return (string)$html;
}

我刚刚根据我的 DomDocument

<?php
$a = '<p>Match this text and replace it</p>
<p>Don\'t <a href="/">match this text</a></p>
<p>We still need to match this text and replace it</p>
';
$res = preg_replace("#[^<a.*>]match this text#",'replacement',$a);
echo $res;
?>

这样行。希望你要真正的大小写敏感,所以配合小字母。

preg_replace('/match this text/i','replacement text');
preg_replace('/(<a[^>]*>[^(<\/a)]*)replacement text(.*?<\/a)/is',"$1match this text$3");

如果你的 replacement text