/**
 * Check if input string has characters are not a letter, digit, underscore
 */
export declare function containsSpecialCharacters(str: string): boolean;
export declare function contains(text: string, words: string[]): boolean;
export declare function filterSpecialChars(str: string): string;
export declare function containsChinese(str: string): boolean;
export declare function containsEmoji(str: string): boolean;