如果文本包含某个单词，如何从文本文件中删除字符串

问题描述：

I am trying to figure out how to remove everything between and including in a text file.

So far I have this that removes a whole urlset from a file.

$myFile = "/here/it/is/sitemap.xml"; 

$stringdata = file_get_contents($myFile);

$stringdata = preg_replace('#(<urlset.*?>).*?(</urlset>)#', '$1$2', $stringdata);

$stringdata = str_replace('<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:video="http://www.google.com/schemas/sitemap-video/1.1"></urlset>', '', $stringdata);

$fh = fopen($myFile, 'w') or die("can't open file");

fwrite($fh, $stringdata);
fclose($fh);

return;

The problem is I have several urlsets in the text file but I only want one of the urlsets to be removed, which is the one that matches a certain variable, so something like this (which doesn't work) :

$stringdata = preg_replace('#(<urlset.*?>).*? . $thisvariableisintheurlset . (</urlset>)#', '$1$2', $stringdata);

Does anyone know what I need to add to this to remove the targeted urlset, or even a better way if this looks like a bad way to attack the problem?

Thanks

我试图找出如何删除文本文件之间的所有内容。 p>

到目前为止，我有一个从文件中删除整个urlset。 p>

  $ myFile =“/ where / it / is / sitemap”;  
 
 $ stringdata = file_get_contents（$ myFile）; 
 
 $ stringdata = preg_replace（'＃（＆lt; urlset。*？＆gt;）。*？（＆lt; / urlset＆gt;）＃'，'$ 1 $ 2  '，$ stringdata）; 
 
 $ stringdata = str_replace（'＆lt; urlset xmlns =“http://www.sitemaps.org/schemas/sitemap/0.9”xmlns：video =“http://www.google  .com / schemas / sitemap-video / 1.1“＆gt;＆lt; / urlset＆gt;'，''，$ stringdata）; 
 
 $ fh = fopen（$ myFile，'w'）或die（”不能 打开文件“）; 
 
fwrite（$ fh，$ stringdata）; 
 nclclose（$ fh）; 
 
return; 
  code>  pre> 
 
 问题是我 在文本文件中有几个urlset，但我只想删除其中一个urlsets，这是一个匹配某个变量的urlsets，所以这样的东西（不起作用）： p> 
 
   $ stringdata = preg_replace（'＃（＆lt; urlset。*？＆gt;）。*？。$ thisvariableisintheurlset。（＆lt; / urlset＆gt;）＃'，'$ 1 $ 2'，$ stringdata）; 
   code>  pre> 
 
 
有没有人知道我需要添加什么来删除目标urlset，或者更好的方法，如果这看起来像是一种不好的方法来解决问题？  p> 
 
 

感谢  p> 
  div>

答

try to use http://php.net/manual/en/function.preg-quote.php

$stringdata = preg_replace('#(<urlset.*?>).*?' . preg_quote($thisvariableisintheurlset, '#') . '.*?(</urlset>)#', '$1$2', $stringdata);

also make sure that the things before and after the quoted variable are matched (I added .*?, but that might be not correct for your case)

如果文本包含某个单词，如何从文本文件中删除字符串

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