/**
 * Shared URL segment validators used by routing/subroute detection.
 */
/**
 * Check if a string is a valid ISO date (YYYY-MM-DD)
 */
export declare function isISODateString(str: string): boolean;
/**
 * Check if a string is a valid UUID
 */
export declare function isUUID(str: string): boolean;
/**
 * Check if a segment is a valid event occurrence segment (ISO date or UUID)
 */
export declare function isValidSegment(segment: string): boolean;
