declare const u_str: {
    empty: (str: string) => boolean;
    uncertainStr: (str?: string) => string;
    before: (subject: string, search: string) => string | undefined;
    after: (subject: string, search: string) => string | undefined;
    afterLast: (subject: string, search: string) => string;
    betweenFirst: (subject: string, from: string, to: string) => string | undefined;
    mask: (subject: string, substitute: string, start?: number, length?: number) => string;
};
export default u_str;
//# sourceMappingURL=str.d.ts.map