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| # | public access |
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| # | private access (full or partial) |
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public access so far, but very likely private access with next version |
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| Concatenation |
Rule1 Rule2 |
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| Alternatives |
Rule1 / Rule2 |
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| Incremental Alternatives |
Rule1 =/ Rule2 |
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The rule set:
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| ruleset | = |
alt1 / alt2 |
| ruleset | /= |
alt3 |
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is the same as specifying:
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| ruleset | = |
alt1 / alt2 / alt3 |
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| Value Range Alternatives |
%c##-## |
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| Sequence Group |
(Rule1 Rule2) |
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| Variable Repetition |
*Rule |
The full form is: <a>*<b>element
where <a> and <b> are optional decimal values, indicating at least
<a> and at most <b> occurrences of element.
Default values are 0 and infinity so that:
| *<element> | |
allows any number, including zero |
| 1*<element> | |
requires at least one |
| 3*3<element> | |
allows exactly 3 |
| 1*2<element> | |
allows one or two |
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| Specific Repetition |
nRule |
A rule of the form:
<n>element
is equivalent to:
<n>*<n>element
That is, exactly <n> occurrences
of <element>. Thus 2DIGIT is a
2-digit number, and 3ALPHA is a string of three alphabetic
characters.
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| Optional Sequence |
[Rule] |
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| Comment |
; Comment |
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Here are the core rules defined in Appendix B.1 of RFC 5234 as a common set for specific grammars.
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| OCTET | = |
%x00-FF |
; 8 bits of data |
| CHAR | = |
%x01-7F |
; any 7-bit US-ASCII character, excluding NUL |
| VCHAR | = |
%x21-7E |
; visible (printing) characters |
| ALPHA | = |
%x41-5A / %x61-7A |
; A-Z / a-z |
| 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 |
| LF | = |
%x0A |
; linefeed |
| CR | = |
%x0D |
; carriage return |
| SP | = |
%x20 |
; space |
| DQUOTE | = |
%x22 |
; " (Double Quote) |
| 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 | = |
CR LF |
; Internet standard newline |
| WSP | = |
SP / HTAB |
; white space |
| LWSP | = |
*(WSP / CRLF WSP) |
; linear white space (past newline) |
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| rulelist | = |
1*( rule
/ (*c-wsp c-nl) )
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| rule | = |
rulename
defined-as
elements
c-nl
; continues if next line starts with white space
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| rulename | = |
ALPHA *(ALPHA
/ DIGIT /
"-" )
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| defined-as | = |
*c-wsp
("="
/ "=/" )
*c-wsp
; basic rules definition and incremental alternatives
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| elements | = |
alternation
*c-wsp
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| c-wsp | = |
WSP / (c-nl WSP)
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| c-nl | = |
comment / CRLF
; comment or newline
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| comment | = |
";" *(WSP
/ VCHAR) CRLF
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| alternation | = |
concatenation
*(*c-wsp
"/"
*c-wsp concatenation)
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| concatenation | = |
repetition
*(1*c-wsp repetition)
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| repetition | = |
[repeat]
element
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| repeat | = |
1*DIGIT / (*DIGIT "*" *DIGIT)
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| element | = |
rulename
/ group
/ option
/ char-val
/ num-val
/ prose-val
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| group | = |
"("
*c-wsp
alternation CRLF
*c-wsp
")"
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| option | = |
"["
*c-wsp
alternation CRLF
*c-wsp
"]"
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| char-val | = |
DQUOTE *(%x20-21 / %x23-7E) DQUOTE
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;
; quoted string of SP and VCHAR without DQUOTE
;
; NOTE: ABNF strings are case-insensitive.
; Hence: rulename = "abc" and: rulename = "aBc"
; will match "abc", "Abc", "aBc", "abC", "ABc", "aBC", "AbC", and "ABC".
; To specify a rule that IS case SENSITIVE, specify the characters individually.
; For example:
; rulename = %d97 %d98 %d99
; or
; rulename = %d97.98.99
; will match only the string that comprises only the lowercased characters, abc.
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| num-val | = |
"%"
(bin-val
/ dec-val
/ hex-val)
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| bin-val | = |
"b" 1*BIT
[ 1*("." 1*BIT)
/ ("-" 1*BIT) ]
; series of concatenated bit values or single ONEOF range
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| dec-val | = |
"d" 1*DIGIT
[ 1*("." 1*DIGIT)
/ ("-" 1*DIGIT) ]
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| hex-val | = |
"x" 1*HEXDIG
[ 1*("." 1*HEXDIG)
/ ("-" 1*HEXDIG) ]
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| prose-val | = |
"<" *(%x20-3D / %x3F-7E)
">"
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; bracketed string of SP and VCHAR without angles
; prose description, to be used as last resort
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