Question

我试图创建一个正则表达式来从示例单词中提取所有MP3 / OGG链接，但我不能！这是一个示例词，我正试图从中提取MP3 / OGG文件：

this is a example word http://domain.com/sample.mp3 and second file is https://www.mydomain.com/sample2.ogg. then this is a link for third file <a href="http://seconddomain.com/files/music.mp3" target="_blank">Download</a>

和PHP部分：

$Word = "this is a example word http://domain.com/sample.mp3 and second file is https://www.mydomain.com/sample2.ogg. then this is a link for third file <a href="http://seconddomain.com/files/music.mp3" target="_blank">Download</a>";


$Pattern = '/href=\"(.*?)\".mp3/';
preg_match_all($Pattern,$Word,$Matches);
print_r($Matches);

我也尝试了这个：

$Pattern = '/href="([^"]\.mp3|ogg)"/';
$Pattern = '/([-a-z0-9_\/:.]+\.(mp3|ogg))/i';

所以我需要你的帮助来修复这段代码并从该示例单词中提取所有MP3 / OGG链接。

谢谢你们。

Answer 1

..从该示例单词中提取所有MP3 / OGG链接。

e.g：

(?<=https?://(.+)?)\.(mp3|ogg)

$ 1 - uri
$ 2 - 扩展名

<强>更新

:(是的，在PHP （v5.5测试）上搜索：

(?<=https?://(.+)?)\.(mp3|ogg)

有限制：

编译失败：lookbehind断言在偏移n处固定长度

所以，类似的变种：

(?<=p1(.+)?)p2 - 如果在
p2(?=(.+)p3) - 匹配p2如果匹配p3之后 - 所有工作都没有固定长度〜。+？ for PHP

您的样本：



//p2(?=.*p3)
preg_match_all("#https?://(?=(.+?)\.(mp3|ogg))#im", $Word, $Matches);

/*
[0] => Array
    (
        [0] => http://
        [1] => https://
        [2] => http://
    )

[1] => Array
    (
        [0] => domain.com/sample
        [1] => www.mydomain.com/sample2
        [2] => seconddomain.com/files/music
    )

[2] => Array
    (
        [0] => mp3
        [1] => ogg
        [2] => mp3
    )
 */

//p2(?=.*p3) preg_match_all("#https?://(?=(.+?)\.(mp3|ogg))#im", $Word, $Matches); /* [0] => Array ( [0] => http:// [1] => https:// [2] => http:// ) [1] => Array ( [0] => domain.com/sample [1] => www.mydomain.com/sample2 [2] => seconddomain.com/files/music ) [2] => Array ( [0] => mp3 [1] => ogg [2] => mp3 ) */

Answer 2

要检索所有链接，您可以使用：

((https?:\/\/)?(\w+?\.)+?(\w+?\/)+\w+?.(mp3|ogg))

Demo

((https?:\/\/)?可选http://或https://

(\w+?\.)+?匹配域组

(\w+?\/)+匹配最终域组并转发斜杠

\w+?.(mp3|ogg))匹配以.mp3或.ogg结尾的文件名。

在您提供的字符串中，有几个未转义的引号，经过更正并添加了我的正则表达式：

$Word = "this is a example word http://domain.com/sample.mp3 and second file is https://www.mydomain.com/sample2.ogg. then this is a link for third file <a href=\"http://seconddomain.com/files/music.mp3\" target=\"_blank\">Download</a>";

$Pattern = '/((https?:\/\/)?(\w+?\.)+?(\w+?\/)+\w+?.(mp3|ogg))/im';
preg_match_all($Pattern,$Word,$Matches);
var_dump($Matches[0]);

产生以下输出：

array (size=3)
  0 => string 'http://domain.com/sample.mp3' (length=28)
  1 => string 'https://www.mydomain.com/sample2.ogg' (length=36)
  2 => string 'http://seconddomain.com/files/music.mp3' (length=39)

使用preg_match_all从String中提取所有MP3和OGG链接

2 个答案: