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$ pwd: C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/mail-2.7.1/lib/mail/parsers/
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File: C:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/mail-2.7.1/lib/mail/parsers/rfc2045_mime.rl
%%{
  # RFC 2045 MIME
  # https://tools.ietf.org/html/rfc2045
  machine rfc2045_mime;
  alphtype int;

  include rfc5322_lexical_tokens "rfc5322_lexical_tokens.rl";

  # 4. MIME-Version Header Field
  # https://tools.ietf.org/html/rfc2045#section-4
  mime_version = CFWS?
            (DIGIT+ >major_digits_s %major_digits_e)
            comment? "." comment?
            (DIGIT+ >minor_digits_s %minor_digits_e)
            CFWS?;
}%%
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