Function tokenHasExplicitPort

src/utils/ssh-config-parser.ts:421–425

* Whether a ProxyJump token carries an explicit `:port` (vs. relying on the * default). Handles an optional `user@` prefix and bracketed IPv6 (`[host]:port`).

(token: string)

 * default). Handles an optional `user@` prefix and bracketed IPv6 (`[host]:port`).
 */
function tokenHasExplicitPort(token: string): boolean {
  const atIndex = token.indexOf('@');
  const hostPart = atIndex !== -1 ? token.slice(atIndex + 1) : token;
  return hostPart.startsWith('[') ? /\]:\d+$/.test(hostPart) : /:\d+$/.test(hostPart);
}