php中正则表达式对斜杠的处理
斜杠需要加两个反斜杠 \\ 进行转义.
$key = "https://file.ipadown.com/tophub/assets/images/media/appinn.com.png";
$key = preg_replace('/https:\\/\\/file.ipadown.com\\/tophub\\/assets\\/images\\/media\\//','',$key);
$key = preg_replace('/.png/','',$key);
echo $key;
完美解决.