Nginx server_name regexp不能用作变量

有谁告诉我为什么我仍然会出现这样的错误？

Restarting nginx: [emerg]: unknown "domain_name" variable
configuration file /etc/nginx/nginx.conf test failed

代码的变量部分如下所示：

server {
    # if you're running multiple servers,instead of "default" you should
    # put your main domain name here
    listen 80 default;

    # you could put a list of other domain names this application answers
    server_name ^~(?<domain_name>[^.]*).(?<tld>[^.]*)$;

    # root defined by domain
    root /home/deployer/apps/$domain_name/current/;

    # access && error && rewrite log
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;
    rewrite_log on;

    # default location
    location / {

...

server_name ^~(?<domain_name>[^.]*).(?<tld>[^.]*)$;

至

server_name ~(?<domain_name>[^.]*).(?<tld>[^.]*)$;

或切换“ ^”和“”.字母“”必须是第一个.

server_name ~^(?<domain_name>[^.]*).(?<tld>[^.]*)$;

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