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$str = "http://www.aaa.com/aa/aa/aa/aa.rar/.page";
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  $str = "http://www.aaa.com/aa/aa/aa/aa.rar/.page";
  ÄãÏëµÃµ½aa.rar,
  1. ¿ÉÒÔÓÃ×Ö·û´®´¦Àíº¯Êý£¬explode('/')£¬ÕâÑù·µ»ØµÄÊý×éµÄµ¹ÊýµÚ¶þ¸öÖµ£¬ÊÇÄãÏëµÃµ½µÄ£»
  2. aa.rarÊdzöÏÖÔÚ¡®/¡¯×Ö·û֮ǰºÍÖ®¼äµÄ£¬ËùÒÔ¿ÉÒÔÀûÓá®/¡¯×Ö·ûµÄλÖ㬽ØÈ¡aa.rar£»
  3. ÀûÓÃÕýÔò±í´ïʽ
      $reg = '/[\:\/\.\w\d]+\/([\w]{1}[\w\d]*\.rar)\/.+/';
    $replaceMent = '\${1}\';
    $fileName = preg_replace(reg,$replaceMent,$str);
    $fileName ΪÄãÒªµÄÖµ
     


$pat = '#(.*)/((.*).rar)/.page$#';

$str0 = "sdfsdfsdfaa.com/aa/aa/aa/aa.rar/.page";
$str1 = "http://wwsdfsdfm/aa/aa/aa/aa.rar/.page";
$str2 = "Òª¿É¸ûµØµØ.com/aa/aa/aa/aa.rar/.page";

preg_match($pat,$str2,$matches);
echo $matches[2];          //Èý¸östr¶¼Êä³ö aa.rar£¬ Èç¹ûÖ»ÒªaaµÄÃû×ÖÔòÈ¡echo $matches[3];


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