Question

我无法找到解决此问题的最佳方案。我们的想法是将包含具有preg_replace_callback()的特定域的文本的所有URL更改为base 64编码。网址属于此类型：http://www.domain.com/?fsdf76sf8sf6fds，另一种方式：http://www.otherdomain.com/file/CA60D10F8ACF7CAA

正则表达式的任何想法？

Answer 1

您正在寻找的是

$s = preg_replace_callback('#(([a-z]+://)|([a-z]+://)?[a-z0-9.-]+\.|\b)domain.com[^\s]+#i', function($match) {
    return base64_encode($match[0]);
}, $string);

这个正则表达式可能有点令人困惑，所以让我们分解它：

(  -- domain.com must be preceeded by either
  ([a-z]+://)   -- a protocol such as http://
  |
  ([a-z]+://)?[a-z0-9.-]+\.  -- possibly a protocol and definitely a subdomain
  |
  \b  -- word-break (prevents otherdomain.com from matching!)
)
domain.com  -- the actual domain you're looking for
[^\s]+  -- everything up to the next space (to include path, query string, fragment)

一个非常简单的系统来测试这样的东西：

<?php

$strings = array(
    // positives
    'a http://www.domain.com/?fsdf76sf8sf6fds z' => 'a xxx z',
    'a www.domain.com/?fsdf76sf8sf6fds z' => 'a xxx z',
    'a http://domain.com/?fsdf76sf8sf6fds z' => 'a xxx z',
    'a domain.com/?fsdf76sf8sf6fds z' => 'a xxx z',
    // negatives
    'a http://www.otherdomain.com/file/CA60D10F8ACF7CAA z' => null,
    'a www.otherdomain.com/file/CA60D10F8ACF7CAA z' => null,
    'a http://otherdomain.com/file/CA60D10F8ACF7CAA z' => null,
    'a otherdomain.com/file/CA60D10F8ACF7CAA z' => null,
);

foreach ($strings as $string => $result) {
    $s = preg_replace_callback('#(([a-z]+://)|([a-z]+://)?[a-z0-9.-]+\.|\b)domain.com[^\s]+#i', function($match) {
        return 'xxx';
    }, $string);

    if (!$result) {
        $result = $string;
    }

    if ($s != $result) {
        echo "FAILED: '$string' got '$s'\n";
    } else {
        echo "OK: '$string'\n";
    }
}

（如果您已经进行了单元测试，请使用它，显然......）

Answer 2

此答案仅适用于以“http://www.domain.com/”或“https://www.domain.com/”开头的网址，但更为精简：

$in = 'before http://www.domain.com/?fsdf76sf8sf6fds after';

$domain = 'www.domain.com';
echo preg_replace_callback('/\b(https?:\/\/'.preg_quote($domain).'\/)\?(\w+)/i', function($m) {
    return 'http://www.otherdomain.com/file/'.base64_encode($m[2]);
}, $in);
// outputs "before http://www.otherdomain.com/file/ZnNkZjc2c2Y4c2Y2ZmRz after"

还有一个问题需要解决，“CA60D10F8ACF7CAA”的示例输出显示base64编码的输出与PHP的base64_encode（）返回的输出不同：

echo base64_encode('fsdf76sf8sf6fds'); // outputs ZnNkZjc2c2Y4c2Y2ZmRz

PHP中的域按URL preg_replace

2 个答案: