preg_match以文件扩展名顺序获取mp3和mp4文件名，然后从外部网页按文件名顺序获取？

Question

我是PHP的新手。我已经尝试了很多次，并且无法提出搜索模式来从外部HTML获取所有mp3和mp4文件名。文件列表的文件扩展名顺序不是文件名顺序。如果有任何帮助，我将不胜感激。

$file = 'http://70.123.0.111//lrs/35/';
$searchfor = '<a herf';
echo $searchfor;

// the following line prevents the browser from parsing this as HTML.
header('Content-Type: text/plain');

// get the file contents, assuming the file to be readable (and exist)
$contents = file_get_contents($file);

// escape special characters in the query
$pattern = preg_quote($searchfor, '/');

// finalise the regular expression, matching the whole line
$pattern = "/^.*$pattern.*\$/";

// search, and store all matching occurences in $matches
if(preg_match_all($pattern, $contents, $matches)){
   echo "Found matches:\n";
   echo implode("\n", $matches[0]);
}
else{
   echo "No matches found";
}   

HTML代码

70.123.0.111 - /lrs/35/

70.123.0.111 - / lrs / 35 /

---

[To Parent Directory]

 7/17/2008  9:02 PM    178899264 0102.mp3
 7/18/2008 12:30 AM    558244970 0102.mp4
 7/17/2008  9:38 PM    186016896 0304.mp3
 7/18/2008  1:44 AM    580476123 0304.mp4
 7/17/2008 10:13 PM    186478272 0506.mp3
 7/18/2008  2:59 AM    581455848 0506.mp4
 7/17/2008 10:44 PM    166862592 0708.mp3
 7/18/2008  4:02 AM    520139478 0708.mp4
 7/17/2008 11:19 PM    188616096 0910.mp3
 7/18/2008  5:16 AM    590308801 0910.mp4
12/11/2008  8:15 PM       688347 qfm_hetu_vidya.pdf
12/11/2008  2:08 PM       421978 ym_notes.pdf

---

Answer 1

我认为如果你是regex的新手，那么www.rubular.com应该是你的新朋友。

假设文本文档总是像你一样，并且文件名中没有任何空格，那么这个正则表达式将执行：“/（\ w + .mp [34]）/”

下面的代码对我有用（不确定$ searchfor变量的用途）。希望这会有所帮助。

$file = 'test.html';
//$searchfor = '<a herf';
//echo $searchfor;

// the following line prevents the browser from parsing this as HTML.
header('Content-Type: text/plain');

// get the file contents, assuming the file to be readable (and exist)
$contents = file_get_contents($file);

// finalise the regular expression, matching the whole line
$pattern = "/(\w+\.mp[34])/";

// search, and store all matching occurences in $matches
if(preg_match_all($pattern, $contents, $matches)){
   echo "Found matches:\n";
   echo implode("\n", $matches[0]);
}
else{
   echo "No matches found";
}   

Answer 2

也许您的问题出现在代码的第二行： $ searchfor ='herf';

（使用href代替herf）