Set variable with value = substring of another variable

Question

Can I use regexps or functions when creating variables? For example, I want to redirect some ports range (e.g., 7xxx -> 5xxx), but I would like do not create many servers - just one like this:

server {
    listen 127.0.0.1:7000-7200;
    listen 7000-7200;
    auth_basic "Restricted Content";
    auth_basic_user_file /etc/nginx/.htpasswd;

    location / {

        set $port 5${server_port:2};
        # or any substring function:
        set $port 5${substring($server_port,2)};
        proxy_pass http://0.0.0.0:$port/;
    }
}

i.e. $port is equal $server_port replacing the first character to symbol '5'. Can I do this?

Thank you for advance/

Ivan Shatsky · Accepted Answer · 2019-11-13 06:18:19Z

1

You can use map directive for this:

map $server_port $port {
    ~^.(.+)$ 5$1;
}

server {
    ...
    location / {
        proxy_pass http://0.0.0.0:$port/;
    }
}

answered Nov 13, 2019 at 6:18

Ivan Shatsky

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