如何使用PHP，更改维基小照片地址为大照片地址？

Question

维基照片的格式大多是
“http://upload.wikimedia.org/wikipedia/commons/thumb/照片名.jpg(png等)/多少像素-照片名.jpg(png等)求一个PHP正则,DOM,或者其他方法，可以更改维基小照片地址变成大照片地址。
去掉thumb部分，截取到第一个 .jpg(png等)。谢谢。比如原始小照片地址：
http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.png/250px-Shanghai_montage.png
大照片地址
http://upload.wikimedia.org/wikipedia/commons/d/de/Shanghai_montage.png

Answer 1

<?php function getBigpicSrc($smallPicsrc){
    $regx = "/^(http:\/\/.+\.(png|gif|jpg|jpeg|bmp))(\/[0-9]+px\-[^\/]+)?$/";
    if (preg_match($regx,$smallPicsrc,$out)) {
        return $out[1];
    }
    return FALSE;
}$arr = array(
"http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.png/250px -Shanghai_montage.png",
"http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.png/250px -Shanghai_montage.pn g",
"http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.pn g/250px -Shanghai_montage.png",
"http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.pn g/250px -Shanghai_montage.pn g",
"http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.gif/250px -Shanghai_montage.gif"
);foreach ($arr as $url){
    $bigsrc = getBigpicSrc($url);
    if ($bigsrc) {
        echo "Ok!";
    }else{
        echo "No!";
    }
    echo "\r\n\t".$url."\r\n\t=> \r\n\t".$bigsrc."\r\n-------------------------\r\n";    
}
/*
X-Powered-By: PHP/5.2.0
Content-type: text/htmlOk!
http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.png/250px -Shanghai_montage.png
=> 
http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.png/250px -Shanghai_montage.png
-------------------------
No!
http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.png/250px -Shanghai_montage.pn g
=> 

-------------------------
Ok!
http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.pn g/250px -Shanghai_montage.png
=> 
http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.pn g/250px -Shanghai_montage.png
-------------------------
No!
http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.pn g/250px -Shanghai_montage.pn g
=> 

-------------------------
Ok!
http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.gif/250px -Shanghai_montage.gif
=> 
http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.gif/250px -Shanghai_montage.gif
-------------------------*/

Answer 2

多写了一个+号， //$regx = "/^(http:\/\/.+\.(png|gif|jpg|jpeg|bmp))(\/[0-9]+px\-[^\/]+)?$/";
$regx = "/^(http:\/\/.+\.(png|gif|jpg|jpeg|bmp))(\/[0-9]+px\-[^\/]+)?$/"; //这个

Answer 3

$url="http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Shanghai_montage.png/250px-Shanghai_montage.png";
$match="#^(.*)(\/thumb)(.*)(\/.*\.(png|gif|jpg|jpeg|bmp))(\/)(.*)$#";
$url=preg_replace($match,"\\1\\3\\4",$url);
echo $url

Answer 4

。function getBigpicSrc($smallPicsrc){
    $regx = "/^(http:\/\/.+\.(jpg|png|bmp|gif|jpeg))(\/[0-9]+px\-[^\/]+\.(jpg|png|bmp|gif|jpeg))?$/isU";
    if (preg_match($regx,$smallPicsrc,$out)) {
        return $out[1];
    }
    return FALSE;
}