Question

this is my created php code for Replac a href value to new url

 $string = "<a href='http://example.com/test'>click here</a>
 <a href='http://example.com/test.mp3'>the site</a>";
 $newurl = "http://newurl.com";
 $pattern = "/(?<=href=(\"|'))[^\"']+(?=(\"|'))/";
 $newstring = preg_replace($pattern,$newurl,$string);
 echo $newstring;

now i want if links with .mp3 or .zip extentions not Replacing to new link

example : i want Replacing " http://example.com/post/1＆＃34;的href值到"http://myotherexample.com/test" 如果链接网址为"http://example.com/test.mp3" 不替换并显示genral url

喜欢这个输出

视图源：

<a href='http://myotherexample.com'>click here</a>
    <a href='http://example.com/test.mp3'>the site</a>

Answer 1

使用否定前瞻：

$string = "<p>Please <a href='http://example.com'>click here</a> to go to <a     href='http://example.com/test.mp3'>the site</a></p>";
$newurl = "http://myotherexample.com";

// Edit according to comment
$pattern = "/(?<=href=(\"|'))[^\"']+\.(?!(?:mp3|zip))(?:\/?\?[^\"']*)?(?=(\"|'))/";

$newstring = preg_replace($pattern,$newurl,$string);

echo $newstring;

<强>输出：

<p>Please <a href='http://myotherexample.com'>click here</a> to go to <a     href='http://example.com/test.mp3'>the site</a></p>

Answer 2

(<a[^>]*?href\s*=\s*['"](?![^'"]*mp3))[^'"]*

这将与包含找不到<a...>的{{1}}的{{1}}相匹配。它会将文本捕获到开头的引号，然后匹配到结束引号，这样您就可以将URL更改为您想要的任何内容。

Example您可以使用网站左侧的code generator获取如何匹配/替换此内容的PHP版本。

替换所有<a> elemnts without link with .mp3 extention

2 个答案: