martin's ABNF

martin.abnf

; Current ABNF
; non-special is VCHAR minus DQUOTE, ";", "(", ")", and "\".
non-special = %x21 / %x23-27 / %x2A-3A / %x3C-5B / %x5D-7E
; non-digit is VCHAR minus DIGIT
non-digit   = %x21-2F / %x3A-7E
; dec-octet is a number 0-255 as a three-digit decimal number.
dec-octet   = ( "0" / "1" ) 2DIGIT /
              "2" ( ( %x30-34 DIGIT ) / ( "5" %x30-35 ) )
escaped     = "\" ( non-digit / dec-octet )
contiguous  = 1*( non-special / escaped )
quoted      = DQUOTE *( contiguous / ( ["\"] WSP ) ) DQUOTE
char-string = contiguous / quoted

; Martin's ABNF
; non-special is VCHAR minus DQUOTE, ";", "(", ")", and "\".
non-special = %x21 / %x23-27 / %x2A-3A / %x3C-5B / %x5D-7E
; non-digit is VCHAR minus DIGIT
non-digit   = %x21-2F / %x3A-7E
; dec-octet is a number 0-255 as a three-digit decimal number.
dec-octet   = ( "0" / "1" ) 2DIGIT /
              "2" ( ( %x30-34 DIGIT ) / ( "5" %x30-35 ) )
escaped     = "\" ( non-digit / dec-octet )
contiguous  = 1*( non-special / escaped )
; VCHAR minus DQUOTE and "\"
quoted-char = WSP / "!" / %x23-5B / %x5D-7E
; OLD quoted      = DQUOTE *( contiguous / ( ["\"] WSP ) ) DQUOTE
quoted      = DQUOTE *( quoted-char / escaped ) DQUOTE
char-string = contiguous / quoted

; diff
< quoted      = DQUOTE *( contiguous / ( ["\"] WSP ) ) DQUOTE
---
> ; VCHAR minus DQUOTE and "\"
> quoted-char = WSP / "!" / %x23-5B / %x5D-7E
> quoted      = DQUOTE *( quoted-char / escaped ) DQUOTE