php preg_replace用于html标签内的属性 [英] php preg_replace for property inside html tags

问题描述

我的问题是如何在字符串中替换<script>标记的src值，如本示例中所示(嗯，在标记属性的更一般情况下，我需要此值):

My problem is how to replace the src value of a <script> tag inside a string like in this example (well, I need this in a more general scenario of properties inside tags):

$data = <<<EOD
<script language="javascript" src= "../tests/ajax-navigation.js"></script>
...
<img src="../404.jpg" alt="404">
...
EOD;

我在php中使用了此功能:

I used this function in php:

class Search{
 public static function replaceProperty($data, $start, $end, $property, $alias, $limit = -1){
   //get blocks formed as: $start $property = "..." $end or $start $property = '...' $end
   $pattern = "!(".$start."){1}(.*?)".$property."\s*=\s*[\"\'](.*?)[\"\'](.*?)(".$end."){1}!s";
   $data = \preg_replace($pattern, "{$start}\${2}{$property}=\"{$alias}\"\${4}{$end}", $data, $limit);
   return $data;
 }
}

我这样称呼:

 $data = Search::replaceProperty($data, "<script", ">", "src", $alias);

真正奇怪的是，标签<script>和<img>都被更改了！ 我当然可以这样称呼

What is really strange is that both tags <script> and <img> get changed! Of course I can call it like

 $data = Search::replaceProperty($data, "<script", "</script>", "src", $alias);

但这不能回答一般情况！

but this doesn't answer the general case!

只需使用正则表达式来阐明几点:

i.要搜索的实际字符串是:

i. the actual string to search for is:

$data = <<<EOD
<script language="javascript" src= "../tests/ajax-navigation.js"></script>
...
<script language="javascript" type="text/javascript">
...
<img src="../404.jpg" alt="404">
...
EOD;

ii.正则表达式$pattern = "!(".$start."){1}(.*?)".$property."\s*=\s*[\"\'](.*?)[\"\'](.*?)(".$end."){1}!s";或最简单的形式$pattern = "%".$start."(.*?)".$property."\s*=\s*[\"\'](.*?)[\"\'](.*?)".$end."%s";(仅3个子模式)按预期标识了第一个<script>，但是...它占用了第二个<script>并终止于第一个<img>的>更改两者之间找到的任何src属性！

ii. the regex $pattern = "!(".$start."){1}(.*?)".$property."\s*=\s*[\"\'](.*?)[\"\'](.*?)(".$end."){1}!s"; or in the simplest form $pattern = "%".$start."(.*?)".$property."\s*=\s*[\"\'](.*?)[\"\'](.*?)".$end."%s"; (just 3 subpatterns) identifies the first <script> as expected but...it takes the second <script> and terminates at the > of the first <img> changing whatever src property it finds in between!

iii.通过删除模式末尾的s元字符，导致$pattern = "%".$start."(.*?)".$property."\s*=\s*[\"\'](.*?)[\"\'](.*?)".$end."%";的行为符合预期，但当使用Enter键破坏标签时失败:

iii. by deleting the s metacharacter at the end of the pattern resulting in $pattern = "%".$start."(.*?)".$property."\s*=\s*[\"\'](.*?)[\"\'](.*?)".$end."%"; behaves as expected but fails when the tags are broken with enters:

<script language="javascript" src= "../tests/ajax-navigation.js"
></script>

iv.当然，我的意图是替换而不是删除src属性中的值.

iv. and, of course my intention is to replace and not to delete the value at src property.

希望这些可以澄清我的问题.

Hope these clarify my question.

推荐答案

正如我所说，我将使用DOMDocument()，但这是使用正则表达式的答案:

As I said I'll use DOMDocument() but here is an answer with regex:

class Search{

public function __construct(){}

public static function replaceProperty($data, $tag, $property, $alias, $limit = -1){
   //get blocks formed as: <$tag...$property=["|']...["|']...[/>|>]
   $pattern = '%<\s*'.$tag.'(\s+(\w+)(\s*\=\s*(\'|"|)(.*?)\\4\s*)?)*\s*(\/>|>)%s';
   $result = \preg_match_all($pattern, $data, $matches, PREG_PATTERN_ORDER);
   if(!empty($result)){
      $search = array();
      $replace = array();
      //found them at index = 0!
      foreach($matches[0] as $i=>$found){
         if(($limit >= 0) && ($i >= $limit))
            break;
         if(isset($matches[2]) && isset($matches[5]) && $matches[2][$i] == $property){
            $search[] = $found;
            $replace[] = \str_replace($matches[5][$i], $alias, $found);
         }
      }
      $data = \str_replace($search, $replace, $data);
   }
   return $data;
}
}

并这样称呼:

$data = Search::replaceProperty($data, "script", "src", $alias);

我从使用了Emanuele Del Grande的答案.此帖子，可能是此！
谢谢.

I used Emanuele Del Grande's answer from this post which might is a reproduction of posts like this!
Thanks.

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