Function isKeyChar

http/unstable_structured_fields.ts:472–475

Check if character is valid within a key (lcalpha / DIGIT / "_" / "-" / "." / "*")

(c: string)

/** Check if character is valid within a key (lcalpha / DIGIT / "_" / "-" / "." / "*") */
function isKeyChar(c: string): boolean {
  return isLcalpha(c) || isDigit(c) || c === "_" || c === "-" || c === "." ||
    c === "*";
}

// Pre-computed lookup table for tchar (RFC 9110 token characters)
// tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." /