module Mail
grammar RFC2045 rule tspecials "(" / ")" / "<" / ">" / "@" / "," / ";" / ":" / '\\' / "<" / ">" / "/" / "[" / "]" / "?" / "=" end rule ietf_token token+ end rule custom_x_token [xX] "-" token+ end rule iana_token token+
# <A publicly-defined extension token. Tokens # of this form must be registered with IANA # as specified in RFC 2048.>
end rule token [\x21-\x27] / # any (US-ASCII) CHAR [\x2a-\x2b] / # except SPACE, [\x2c-\x2e] / # CTLs, [\x30-\x39] / # or tspecials [\x41-\x5a] / [\x5e-\x7e] end end
end