From catalog/abnf-syntax.abnf rule: defined-as

Definition

defined-as = *c-wsp ( "=" / "=/" ) *c-wsp

c-wsp = WSP / ( c-nl WSP )

c-nl = comment / CRLF

comment = ";" *( WSP / VCHAR ) CRLF

Info

Rulename
defined-as
Dependencies
WSP, CRLF, VCHAR, comment, c-nl, c-wsp, defined-as
Used Builtins
CRLF, VCHAR, WSP

Alphabet

Translations

Railroad Diagram

defined-as c-wsp = =/ c-wsp

ECMAScript/JavaScript Regular Expression Literal

/^(((\u{D}|;[\u{9} -~]*\u{D})\x0A)?[\x09 ])*=(([\u{9} /]|(\u{D}|;[\u{9} -~]*\u{D})\u{A}[\u{9} ])([\u{9} ]|(\u{D}|;[\u{9} -~]*\u{D})\u{A}[\u{9} ])*)?$/

Swift Regular Expression

(((\u{D}|;[\u{9} -~]*\u{D})\u{A})?[\u{9} ])*=(([\u{9} /]|(\u{D}|;[\u{9} -~]*\u{D})\u{A}[\u{9} ])([\u{9} ]|(\u{D}|;[\u{9} -~]*\u{D})\u{A}[\u{9} ])*)?

POSIX Extended Regular Expression

(((\u{D}|;[\u{9} -~]*\u{D})\x0A)?[\x09 ])*=(|([\u{9} /]|(\u{D}|;[\u{9} -~]*\u{D})\u{A}[\u{9} ])([\u{9} ]|(\u{D}|;[\u{9} -~]*\u{D})\u{A}[\u{9} ])*)