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#
# email_address_parser.py
#
# email address parser based on RFC 5322 BNF segments
# - see https://datatracker.ietf.org/doc/html/rfc5322#section-3.4.
#
# The returned parse results include named fields 'account' and 'domain'
# for emails of the form `account@domain`.
#
# Copyright 2024, by Paul McGuire
#
from pyparsing import Regex
email_address = Regex(
# RFC5322 email address
r"""(?P<account>(?:(?:\"[\w\s()<>[\].,;:@"]+\")|[!#-'*+\-/-9=?A-Z\^-~.]+))"""
"@"
r"""(?P<domain>(?:(?:(?!-)[!#-'*+\-/-9=?A-Z\^-~]{1,63}(?<!-)\.)+[A-Za-z0-9]{2,6})|(?:\[[!-Z^-~]+\]))(?:\b|$)"""
).set_name("email address")
def main():
success, _ = email_address.run_tests(
"""\
email@example.com
firstname.lastname@example.com
email@subdomain.example.com
firstname+lastname@example.com
email@123.123.123.123
email@[123.123.123.123]
"email"@example.com
1234567890@example.com
email@example-one.com
_______@example.com
email@example.name
email@example.museum
email@example.co.jp
firstname-lastname@example.com
"""
)
assert success
if __name__ == "__main__":
main()
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