From catalog/rfc9110-http.abnf rule: field-content

Definition

field-content = field-vchar [ 1*( SP / HTAB / field-vchar ) field-vchar ]

field-vchar = VCHAR / obs-text

obs-text = %x80-ff

Info

Rulename
field-content
Dependencies
HTAB, SP, VCHAR, obs-text, field-vchar, field-content
Used Builtins
HTAB, SP, VCHAR

Alphabet

Translations

Railroad Diagram

field-content field-vchar SP HTAB field-vchar field-vchar

ECMAScript/JavaScript Regular Expression Literal

/^[!-~\u{80}-\u{FF}]([\x09 -~\u{80}-\u{FF}][\x09 ]*[!-~\u{80}-\u{FF}]([!-~\u{80}-\u{FF}]|[\u{9} ]+[!-~\u{80}-\u{FF}])*)?$/

Swift Regular Expression

[!-~\u{80}-\u{FF}]([\u{9} -~\u{80}-\u{FF}][\u{9} ]*[!-~\u{80}-\u{FF}]([!-~\u{80}-\u{FF}]|[\u{9} ]+[!-~\u{80}-\u{FF}])*)?

POSIX Extended Regular Expression

[!-~\u{80}-\u{FF}](|[\u{9} -~\u{80}-\u{FF}][\u{9} ]*[!-~\u{80}-\u{FF}]([!-~\u{80}-\u{FF}]|[\u{9} ][\u{9} ]*[!-~\u{80}-\u{FF}])*)