This library uses Mozilla's Public Suffix List to reliably parse domain names in Rust. It will reliably check if a domain has valid syntax. It also checks the length restrictions for each label, total number of labels and full length of domain name.
```rust use addr::{DnsName, DomainName};
fn main() -> addr::Result<()> { // You can find out the root domain // or extension of any given domain name let domain = DomainName::parse("www.example.com")?; asserteq!(domain.root(), Some("example.com")); asserteq!(domain.suffix(), "com");
let domain = DomainName::parse("www.食狮.中国")?;
assert_eq!(domain.root(), Some("食狮.中国"));
assert_eq!(domain.suffix(), "中国");
let domain = DomainName::parse("www.xn--85x722f.xn--55qx5d.cn")?;
assert_eq!(domain.root(), Some("xn--85x722f.xn--55qx5d.cn"));
assert_eq!(domain.suffix(), "xn--55qx5d.cn");
let domain = DomainName::parse("a.b.example.uk.com")?;
assert_eq!(domain.root(), Some("example.uk.com"));
assert_eq!(domain.suffix(), "uk.com");
let name = DnsName::parse("_tcp.example.com.")?;
assert_eq!(name.root(), Some("example.com."));
assert_eq!(name.suffix(), Some("com."));
// In any case if the domain's suffix is in the list
// then this is definately a registrable domain name
assert!(domain.has_known_suffix());
} ```
For those who work with domain names the use cases of this library are plenty. publicsuffix.org/learn lists quite a few. For the sake of brevity, I'm not going to repeat them here. I work for a domain registrar so we make good use of this library. Here are some of the ways this library can be used:
domain.has_known_suffix() you can be absolutely sure this is a valid domain name. A regular expression is simply not robust enough.