import { CompareResult } from './compare';
export declare function str_contains(pattern: string, target: string, ignore_case?: boolean): boolean;
export declare function str_contains_any(patterns: string[], target: string, ignore_case?: boolean): boolean;
/**
 * example : 'change the words' ~> 'Change The Words'
 * */
export declare function strToCapWords(s: string): string;
export declare function string_to_chars(s: string): string[];
export declare function escapeRegExp(str: string): string;
export declare function string_nbyte(s: string): number;
export declare function str_like(a: string, b: string, ignore_case?: boolean): boolean;
export declare function is_non_empty_string(s: string): boolean;
export declare function str_dos2unix(s: string): string;
export declare function str_unix2dos(s: string): string;
export declare function str_minus(a: string, b: string): string;
export type compare_chunks = Array<string | number>;
export declare function split_string_num(s: string): compare_chunks;
export declare function compare_string(a: string, b: string): CompareResult;
export declare function extract_lines(s: string): string[];
export declare function capitalize(word: string): string;
/** @description using perl naming conversion */
export declare function lcfirst(word: string): string;
/** @description using perl naming conversion */
export declare function ucfirst(word: string): string;
/** @description aware of unicode, e.g. emoji */
export declare function first_char(text: string): string | null;
/** @description aware of unicode, e.g. emoji */
export declare function last_char(text: string): string | null;
export declare function is_ascii_char(char: null | string): boolean;
export declare function concat_words(start: string, end: string): string;