/**
 * Validation utilities for common data validation patterns
 */
/**
 * Email validation regex
 */
export declare const EMAIL_REGEX: RegExp;
/**
 * Username validation regex (alphanumeric, underscores, and hyphens, 3-30 chars)
 */
export declare const USERNAME_REGEX: RegExp;
/**
 * Password validation regex (at least 8 chars, 1 uppercase, 1 lowercase, 1 number)
 */
export declare const PASSWORD_REGEX: RegExp;
/**
 * Validate email format
 */
export declare function isValidEmail(email: string): boolean;
/**
 * Validate username format
 */
export declare function isValidUsername(username: string): boolean;
/**
 * Validate password strength
 */
export declare function isValidPassword(password: string): boolean;
/**
 * Validate required string
 */
export declare function isRequiredString(value: unknown): boolean;
/**
 * Validate required number
 */
export declare function isRequiredNumber(value: unknown): boolean;
/**
 * Validate required boolean
 */
export declare function isRequiredBoolean(value: unknown): boolean;
/**
 * Validate array
 */
export declare function isValidArray(value: unknown): boolean;
/**
 * Validate object
 */
export declare function isValidObject(value: unknown): boolean;
/**
 * Validate UUID format
 */
export declare function isValidUUID(uuid: string): boolean;
/**
 * Validate URL format
 */
export declare function isValidURL(url: string): boolean;
/**
 * Validate date string
 */
export declare function isValidDate(dateString: string): boolean;
/**
 * Validate file size (in bytes)
 */
export declare function isValidFileSize(size: number, maxSize: number): boolean;
/**
 * Validate file type
 */
export declare function isValidFileType(filename: string, allowedTypes: string[]): boolean;
/**
 * Sanitize string input
 */
export declare function sanitizeString(input: string): string;
/**
 * Sanitize HTML input
 */
export declare function sanitizeHTML(input: string): string;
/**
 * Validate MongoDB ObjectId format
 * Note: This is a basic format check. For full validation, use mongoose.Types.ObjectId.isValid()
 * This function works in environments where mongoose may not be available (e.g., client-side)
 */
export declare function isValidObjectId(id: string): boolean;
/**
 * Validate and sanitize user input
 */
export declare function validateAndSanitizeUserInput(input: unknown, type: 'string' | 'email' | 'username'): string | null;
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