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Reject an underscore in the last domain label - #485
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The last label allowed "_" with or without rfc_2782, so foo.ba_r validated.
This was referenced Oct 10, 2026
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Thanks for merging this. An underscore in the last label is no longer accepted as a domain. |
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domain("foo.ba_r")returned True, anddomain("example.co_uk")did too.hostname("foo.ba_r")andemail("a@foo.ba_r")did too.An underscore is allowed in a service label when
rfc_2782is set.example_.comand_sip._tcp.example.comstill need that flag, and they still pass with it. The last label allowed_either way.example.com,xn----gtbspbbmkef.xn--p1ai, anda.costill pass.Fixes #484.
Test plan
pytest tests/test_domain.py tests/test_hostname.py tests/test_email.py(119 passed)