问个 nginx 配置问题

抄来的 nginx 配置，第 1 个 location 的正则表达式不太确定是否正确。按照 AI 的解答，用于匹配下面这几种路径。实测下来，http git clone 也是失败的，未匹配第 1 个 location 。有几个疑点：

1. 类似这种多行的正则，每一行之间是什么关系？按照 AI 的解答看上去是或的关系，但是没找到正则规则的依据。
2. 每一行正则结尾是 空格 + 单引号，这个不知道又是什么规则？

• /git/xxx/HEAD （获取仓库的 HEAD 文件）
• /git/xxx/info/refs （获取仓库引用信息）
• /git/xxx/objects/...（处理 Git 对象）
• /git/xxx/git-upload-pack

 location ~ "(?x)^/git(?<path>/.*/(?:HEAD ' info/refs ' objects/(?:info/[^/]+ ' [0-9a-f]{2}/[0-9a-f]{38} ' pack/pack-[0-9a-f]{40}\.(?:pack ' idx)) ' git-upload-pack))$" { error_page 491 = @auth; if ($query_string = service=git-receive-pack) { return 491; } client_max_body_size 0; fastcgi_param SCRIPT_FILENAME /usr/lib/git-core/git-http-backend; include fastcgi_params; fastcgi_param GIT_HTTP_EXPORT_ALL ""; fastcgi_param GIT_PROJECT_ROOT /srv/git; fastcgi_param PATH_INFO $path; fastcgi_param REMOTE_USER $remote_user; fastcgi_pass unix:/var/run/fcgiwrap.socket; } location ~ "^/git(?<path>/.*/git-receive-pack)$" { error_page 491 = @auth; return 491; } location @auth { auth_basic "Git write access"; auth_basic_user_file /srv/git/.htpasswd; client_max_body_size 0; fastcgi_param SCRIPT_FILENAME /usr/lib/git-core/git-http-backend; include fastcgi_params; fastcgi_param GIT_HTTP_EXPORT_ALL ""; fastcgi_param GIT_PROJECT_ROOT /srv/git; fastcgi_param PATH_INFO $path; fastcgi_param REMOTE_USER $remote_user; fastcgi_pass unix:/var/run/fcgiwrap.socket; } location ~ ^/git(?<path>/.*)$ { alias /usr/share/cgit; try_files $1 @cgit; } location @cgit { include fastcgi_params; fastcgi_param SCRIPT_FILENAME /usr/lib/cgit/cgit.cgi; fastcgi_param PATH_INFO $path; fastcgi_param QUERY_STRING $args; fastcgi_param HTTP_HOST $server_name; fastcgi_param CGIT_CONFIG /srv/git/.cgitrc; fastcgi_pass unix:/var/run/fcgiwrap.socket; }