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Augmented Backus-Naur Form (ABNF) Notation and Rules
RFC 5234

ABNF Core Rules

RFC 5234 – Appendix B.1

OCTET =
%x00-FF
; 8 bits of data
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CHAR =
%x01-7F
; any 7-bit US-ASCII character,
; excluding NUL
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VCHAR =
%x21-7E
; visible (printing) characters
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ALPHA =
%x41‑5A /  %x61‑7A
; A‑Z  /  a‑z
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DIGIT =
%x30‑39
; 0-9
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CTL =
%x00‑1F /  %x7F
; any US-ASCII control character:
; (octets 0 - 31) and DEL (127)
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HTAB =
%x09
; horizontal tab
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LF =
%x0A
; linefeed
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CR =
%x0D
; carriage return
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SP =
%x20
; space
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DQUOTE =
%x22
; " (Double Quote)
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BIT =
"0" /  "1"
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HEXDIG =
DIGIT /  "A" /  "B" /  "C" /  "D" /  "E" /  "F"
; Note: according to the 'char-val' rule,
; letters (A-F) are case insensitive
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CRLF =
CRLF
; Internet standard newline
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WSP =
SP /  HTAB
; white space
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LWSP =
*( WSP /  CRLFWSP )
; linear white space (past newline)
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