export declare class URLHelper {
    static readonly PROTOCOLS: string[];
    static readonly TLD_MIN_LENGTH = 2;
    static readonly TLD_MAX_LENGTH = 63;
    static readonly MAX_DOMAIN_LENGTH = 255;
    static readonly MAX_URL_LENGTH = 2083;
    static readonly IPV4_PATTERN = "(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)";
    static readonly IPV6_PATTERN: string;
    static readonly DOMAIN_PATTERN: string;
    static readonly URL_PATTERN: RegExp;
}