Created
July 10, 2012 01:07
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RFC822 Email Validation Regex in Ruby
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# RFC822 Email Address Regex | |
# -———————————- | |
# Originally written by Cal Henderson | |
# c.f. http://iamcal.com/publish/articles/php/parsing_email/ | |
# | |
# Translated to Ruby by Tim Fletcher, with changes suggested by Dan Kubb. | |
# | |
# Licensed under a Creative Commons Attribution-ShareAlike 2.5 License | |
# http://creativecommons.org/licenses/by-sa/2.5/ | |
module RFC822 | |
EmailAddress = begin | |
qtext = '[^\\x0d\\x22\\x5c\\x80-\\xff]' | |
dtext = '[^\\x0d\\x5b-\\x5d\\x80-\\xff]' | |
atom = '[^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-' + '\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+' | |
quoted_pair = '\\x5c[\\x00-\\x7f]' | |
domain_literal = "\\x5b(?:#{dtext}|#{quoted_pair})*\\x5d" | |
quoted_string = "\\x22(?:#{qtext}|#{quoted_pair})*\\x22" | |
domain_ref = atom | |
sub_domain = "(?:#{domain_ref}|#{domain_literal})" | |
word = "(?:#{atom}|#{quoted_string})" | |
domain = "#{sub_domain}(?:\\x2e#{sub_domain})*" | |
local_part = "#{word}(?:\\x2e#{word})*" | |
addr_spec = "#{local_part}\\x40#{domain}" | |
pattern = /\A#{addr_spec}\z/ | |
end | |
end |
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