urbit/pkg/interface/webterm/constants.ts

export const DEFAULT_SESSION = '';

/**
 * Session ID validity:
 * 
 * - must start with an alphabetical
 * - can be composed of alphanumerics with hyphens
 * - can be length 1 or longer
 * - cannot begin or end with a hyphen
 */
export const SESSION_ID_REGEX = /(^[a-z]{1}[a-z\d\-]*[a-z\d]{1}$)|(^[a-z]{1}$)/;

/**
 * Open a session with a given agent using `[agent]![session_name]
 * 
 * For example:
 * ```
 * book!my-session
 * ```
 * 
 * This will create a new session in webterm for the `%book` agent.
 * 
 * Note that the second capture group after the ! is composed of the session ID 
 * regex above.
 */
export const AGENT_SESSION_REGEX = /^([a-z]{4})\!(([a-z]{1}[a-z\d\-]*[a-z\d]{1}$)|(^[a-z]{1}))/;