From catalog/rfc8259-json-object.abnf rule: key

Definition

key = string

string = quotation-mark *char quotation-mark

quotation-mark = %x22

char = unescaped / escape (%x22 / %x5c / %x2f / %x62 / %x66 / %x6e / %x72 / %x74 / %x75 4HEXDIG)

unescaped = %x20-21 / %x23-5b / %x5d-10ffff

escape = %x5c

Info

Rulename: key
Dependencies: HEXDIG, escape, unescaped, char, quotation-mark, string, key
Used Builtins: HEXDIG

Alphabet

␠…! #…. :…@ G…[ ]…` g…m o…q s v…U+10FFFF
"
/ n r t
0…9 A…F a c…e
\
b f
u

Translations

Railroad Diagram

Swift Regular Expression

"[ -!#-\[\]-\u{10FFFF}]*"|"[ -!#-\[\]-\u{10FFFF}]*\\(["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*\\)*["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*"|"[ -!#-\[\]-\u{10FFFF}]*\\(["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*\\)*u[0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f]([0-9A-Fa-f][ -!#-\[\]-\u{10FFFF}]*\\(["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*\\)*u[0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f])*([0-9A-Fa-f][ -!#-\[\]-\u{10FFFF}]*"|[0-9A-Fa-f][ -!#-\[\]-\u{10FFFF}]*\\(["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*\\)*["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*")

POSIX Extended Regular Expression

"[ -!#-\[\]-\u{10FFFF}]*"|"[ -!#-\[\]-\u{10FFFF}]*\\(["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*\\)*["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*"|"[ -!#-\[\]-\u{10FFFF}]*\\(["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*\\)*u[0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f]([0-9A-Fa-f][ -!#-\[\]-\u{10FFFF}]*\\(["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*\\)*u[0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f])*([0-9A-Fa-f][ -!#-\[\]-\u{10FFFF}]*"|[0-9A-Fa-f][ -!#-\[\]-\u{10FFFF}]*\\(["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*\\)*["/\bfnrt][ -!#-\[\]-\u{10FFFF}]*")