Function is_domain_name 

pub fn is_domain_name(host: &str) -> bool

Check if the given host is a domain name (not an IP address or special value)

Returns true for domain names like example.com, api.backend.internal, localhost Returns false for IP addresses, unix sockets, variables, or upstream names without dots

Examples

use nginx_lint_plugin::helpers::is_domain_name;

// Domain names
assert!(is_domain_name("example.com"));
assert!(is_domain_name("api.example.com"));
assert!(is_domain_name("localhost"));
assert!(is_domain_name("backend.internal"));
assert!(is_domain_name("example.com:8080"));

// Not domain names
assert!(!is_domain_name("127.0.0.1"));
assert!(!is_domain_name("127.0.0.1:8080"));
assert!(!is_domain_name("[::1]"));
assert!(!is_domain_name("[::1]:8080"));
assert!(!is_domain_name("$backend"));
assert!(!is_domain_name("unix:/var/run/app.sock"));
assert!(!is_domain_name("backend")); // upstream name without dots