ABNF.qcontent Field

[This is preliminary documentation and subject to change.]

RFC 2822 Section 3.2.5

public const string qcontent = "(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x7F\x21\x23-\x5A\x5B\x5D-\x7E]|[\x5C][\x01-\x09\x0B\x0C\x0E-\x7F])";