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替换前：http://www.163.com/cc/替换前内容/
替换后http://www.163.com/cc/替换后内容/
认证高级PHP讲师
$str="http://www.163.com/cc/content before replacement/";$preg = "/cc/(.+)//";$after = preg_replace($preg, "To Replacement content", $str);
$subject = preg_replace('//替换前内容\//', '/替换后内容/', 'http://www.163.com/cc/替换前内容/'); var_dump($subject);
$url = preg_replace('/替换前内容/', '替换后内容', 'http://www.163.com/cc/替换前内容/'); 或者 $url = preg_replace('#替换前内容#', '替换后内容', 'http://www.163.com/cc/替换前内容/');
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
$str="http://www.163.com/cc/content before replacement/";
$preg = "/cc/(.+)//";
$after = preg_replace($preg, "To Replacement content", $str);