php - 使用 PHP 和 Regex 替换所有域，包括子域名

Question

我在 PHP 中使用 preg_replace 或 str_replace 来替换所有域名，包括 www

$string = ' https://example.com, https://www.example.com, https://subdomain.example.com ';
$olddomain= "example.com";
$newdomain = "stackoverflow.com";

$output = str_replace($olddomain, $newdomain, $string);
$output = preg_replace('#(www[.])?[.]' . $olddomain. '#', $newdomain, $body);

echo $output;

我的期望:

https://example.com -> https://stackoverflow.com

https://www.example.com -> https://stackoverflow.com

https://subdomain.example.com -> https://subdomain.example.com

Answer 1

preg_replace 为正则表达式。

$string = ' https://example.com, https://www.example.com, https://subdomain.example.com ';
$olddomain= "example.com";
$newdomain = "stackoverflow.com";

$output = preg_replace('#(https://(www\.)?)' . $olddomain. '#', '$1' . $newdomain, $string);

echo $output;

输出:

https://stackoverflow.com, https://www.stackoverflow.com, https://subdomain.example.com