17 lines
632 B
Python
17 lines
632 B
Python
from re import IGNORECASE
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from re import compile as re_compile
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HOST_REGEX = re_compile(
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# max length for domain name labels is 63 characters per RFC 1034
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r'((?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+)' +
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r'(?:[A-Z0-9-]{2,63}(?<!-))\Z', IGNORECASE)
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LITERAL_REGEX = re_compile(
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# literal form, ipv4 or ipv6 address (SMTP 4.1.3)
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r'\[([A-f0-9:\.]+)\]\Z', IGNORECASE)
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USER_REGEX = re_compile(
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# dot-atom
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r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*\Z" +
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# quoted-string
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r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-\011\013' +
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r'\014\016-\177])*"\Z)', IGNORECASE)
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