Module abnf::core

Parsing of ABNF Core Rules

See https://tools.ietf.org/html/rfc5234#appendix-B.1

Functions

ALPHA	ALPHA = %x41-5A / %x61-7A ; A-Z / a-z
BIT	BIT = "0" / "1"
CHAR	CHAR = %x01-7F ; any 7-bit US-ASCII character, excluding NUL
CR	CR = %x0D ; carriage return
CRLF	CRLF = CR LF ; Internet standard newline
CTL	CTL = %x00-1F / %x7F ; controls
DIGIT	DIGIT = %x30-39 ; 0-9
DQUOTE	DQUOTE = %x22 ; " (Double Quote)
HEXDIG	HEXDIG = DIGIT / "A" / "B" / "C" / "D" / "E" / "F"
HTAB	HTAB = %x09 ; horizontal tab
LF	LF = %x0A ; linefeed
LWSP	LWSP = *(WSP / CRLF WSP) ; Use of this linear-white-space rule ; permits lines containing only white ; space that are no longer legal in ; mail headers and have caused ; interoperability problems in other ; contexts. ; Do not use when defining mail ; headers and use with caution in ; other contexts.
OCTET	OCTET = %x00-FF ; 8 bits of data
SP	SP = %x20
VCHAR	VCHAR = %x21-7E ; visible (printing) characters
WSP	WSP = SP / HTAB ; white space
is_ALPHA
is_CHAR
is_CTL
is_DIGIT
is_HEXDIG
is_VCHAR
is_WSP