Question

我希望将所有以下网址中的文件扩展名仅与问号相匹配。所以URL＃4将匹配＆＃34; file.pdf＆＃34;中的pdf。但不是＆＃34; exe＆＃34; in＆＃34; otherfile.exe＆＃34;。

http://www.someplace.com/directory/file.pdf
http://www.someplace.com/directory/file.pdf?otherstuff=true
http://www.someplace.com/directory/file.pdf?other=true&more=false
http://www.someplace.com/directory/file.pdf?other=true&more=false&value=otherfile.exe

我该怎么做？

我尝试了这个，但它无法正常工作：

([^\.]+)(\?|[^\?]$)+

Answer 1

这将是我将使用的版本

/\w+\.[A-Za-z]{3,4}(?=\?|$)/

这是一个工作版本：

http://regex101.com/r/sY2fR0/1

使用前瞻两种方式？或者字符串(?=\?|$)的结尾然后您可以匹配它背后的内容。

$re = "/\\w+\\.[A-Za-z]{3,4}(?=\\?|$)/"; 
$str = "http://www.someplace.com/directory/file.pdf?other=true&more=false&value=otherfile.exe\n\n"; 

preg_match($re, $str, $matches);

Answer 2

对于匹配尝试这种不区分大小写的函数：

function matchURLs($desiredURL, $compareURL){
  $url = parse_url($compareURL);
  if(preg_match('/^'$url['scheme'].'://'.$url['host'].$url['path'].'$/i', $desiredURL)){
    return true;
  }
  return false;
}
matchURLs('http://www.someplace.com/directory/file.pdf', 'http://www.someplace.com/directory/file.exe'); // false
matchURLs('http://www.someplace.com/directory/file.pdf', 'http://www.someplace.com/directory/file.pdf?value=file.exe'); // true

要在?：

之前获取

function URL_before_query($url){
  $u = parse_url($url);
  return $u['scheme'].'://'.$u['host'].$u['path'];
}
echo URL_before_query('http://www.someplace.com/directory/file.pdf?other=true&more=false&value=otherfile.exe'); // http://www.someplace.com/directory/file.pdf

Answer 3

<?
$str = '
http://www.someplace.com/directory/file1.pdf
http://www.someplace.com/directory/file2.pdf?otherstuff=true 
http://www.someplace.com/directory/file3.pdf?other=true&more=false 
http://www.someplace.com/directory/file4.pdf?other=true&more=false&value=otherfile.exe
';
$regex= '~.*/\K[^?\n]+~';

preg_match_all($regex, $str, $out, PREG_SET_ORDER);
print_r($out);
?>

<强>输出

Array ( 
   [0] => Array ( 
                 [0] => file1.pdf 
                ) 
   [1] => Array ( 
                 [0] => file2.pdf 
                ) 
   [2] => Array ( 
                 [0] => file3.pdf 
                ) 
   [3] => Array ( 
                 [0] => file4.pdf 
                 ) 
  )

如何匹配可以以查询字符串结尾的URL中的文件扩展名？

3 个答案: