DomainStr fails to validate punycode (IDN) TLDs such as xn--... #326
Description
The DomainStr type fails to accept valid punycode domain names with internationalized TLDs, such as:
xn--7-7sbirhro.xn--80ahmohdapg.xn--80asehdb
This domain is technically valid, but DomainStr raises a validation error due to the regex pattern used:
_domain_re_pattern = r'(?=^.{1,253}$)(^((?!-)[a-zA-Z0-9-]{1,63}(?<!-)\.)+[a-zA-Z]{2,63}$)'The final [a-zA-Z]{2,63} segment disallows punycode TLDs like xn--p1ai, xn--80asehdb, etc., which are valid ASCII representations of internationalized domain names (IDNs).
Expected behavior
DomainStr should allow punycode-based TLDs that conform to valid IDN formats (e.g., those starting with xn--).
Suggested fix
Adjust the regex to support both regular TLDs and punycode (e.g. ([a-zA-Z]{2,63}|xn--[a-zA-Z0-9]{2,59})).
Environment
- pydantic-extra-types version: 2.10.5
- Python version: 3.12
- Platform: (Linux/Windows/Mac)