import { type ErrorInfo } from '../core';
export declare const EMAIL_REGEXP: RegExp;
export declare const ALLOWED_USERNAME_START_SYMBOL_REGEXP: RegExp;
export declare const ALLOWED_HOSTNAME_START_SYMBOL_REGEXP: RegExp;
export declare const EMAIL_CYRILLIC_PUNYCODE_REGEXP: RegExp;
export declare const LATIN_SYMBOLS: RegExp;
export declare const CYRILLIC_SYMBOLS: RegExp;
export declare const EMAIL_MAX_LENGTH = 254;
export declare const PUNYCODE_REGEXP: RegExp;
export declare const INVALID_EMAIL_ERROR_INFO: ErrorInfo;
export declare const LENGTH_EMAIL_ERROR_INFO: ErrorInfo;
export declare const DOUBLE_DOTS_EMAIL_ERROR_INFO: ErrorInfo;