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fix: reject MAC addresses with mixed separators by iCasture · Pull Request #432 · python-validators/validators · GitHub

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fix: reject MAC addresses with mixed separators #432

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Merged
nandgator merged 1 commit into from
Oct 3, 2025
+4 −0
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fix: reject MAC addresses with mixed separators #432

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4 changes: 4 additions & 0 deletions src/validators/mac_address.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,4 +29,8 @@ def mac_address(value: str, /):
(Literal[True]): If `value` is a valid MAC address.
(ValidationError): If `value` is an invalid MAC address.
"""
# Check for mixed separators: MAC addresses cannot use both ':' and '-' simultaneously
if ":" in value and "-" in value:
return False

return re.match(r"^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$", value) if value else False
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