/**
 * RegExp utilities. Use this module by importing from `@sirpepe/shed/regexp`.
 */
/**
 * Indicates whether `input` is either a regular expression object or a string
 * containing a valid regular expression.
 */
export declare function isRegExp(input: RegExp): input is RegExp;
export declare function isRegExp(input: string): boolean;
export declare function isRegExp(input: unknown): boolean;
/**
 * Escapes a string for use in regular expressions.
 */
export declare function escapeRegExpString(string: string): string;