/**
 * Returns a boolean value indicating whether the regular expression pattern matches any part of the input str.
 *
 * It checks if the pattern parameter is a regular expression.
 * If it is not, it creates a new regular expression object from the pattern parameter and optional flags parameter.
 *
 * @param str inpput string
 * @param pattern a regular expression
 * @param flags optional string flags for the regular expression
 * @returns
 */
export declare const matches: (str: string, pattern: RegExp, flags?: string) => boolean;