/**
 * Regular expression to validate a 6-digit hexadecimal color code (e.g., "#1a2b3c").
 *
 * - Must start with a "#" symbol.
 * - Followed by exactly 6 lowercase hexadecimal characters (0–9, a–f).
 */
export declare const hexColorRegex: RegExp;
/**
 * Regular expression to validate months in 2-digit format ("01" to "12").
 */
export declare const twoDigitMonthRegex: RegExp;
/**
 * Regular expression to validate 4-digit years starting with "20" (e.g., "2024").
 */
export declare const fourDigitYearRegex: RegExp;