export declare class UtilString {
    /** It returns a boolean true its is a valid string, valid is not false, null or length equals 0 */
    static isValid(value: any): boolean;
    /** It returns a string with first character upper */
    static capitalize(value: string): string;
    /** It returns a string with first character upper */
    static initialLetters(value: string, separator?: string, joinValue?: string): string;
    /** It's copy the text to clipboard. */
    static copyMessage(val: string): void;
    static accentsTidy(s: any): string;
    /**
     * Use accentsTidy and replace the spaces and _ to -.
     * At the end only accept alphanumerics characters and -.
     * @param s
     */
    static replaceAccentSpacesOthers(s: any): string;
    /**
     * It validates if an email is correct
     * @param email
     */
    static validateEmail(email: any): boolean;
    /**
     * It returns the extension of filename
     * @param filename
     */
    static getExtensionOfFileName(filename: string): string;
    /**
     * It creates a rando string according to size param
     * @param size
     */
    static createRandomString(size: number): string;
    /**
     * It creates a random filename accoding to the filename
     * @param filename
     */
    static createRandomFilename(filename: string): string;
    static createPDFFileByBase64(base64: string, fileName: string): File;
    /** convert hex 2 bin */
    static hex2bin(hex: any): string;
    /** It returns the lower case of string */
    static lowerCase(str: string): string;
    /** It returns the upper case of string */
    static upperCase(str: string): string;
    /*** Replaces all accented chars with regular ones*/
    static replaceAccents(str: string): string;
    /** it returns the camel case */
    static camelCase(str: string): string;
    static cleanHTMLString(str: string): string;
}