/**
 * @internal
 */
export declare function execRegex(regex: RegExp, val: string): string[];
/**
 * @internal
 */
export declare function parseFunction(fnStr: string): {
    args: string[];
    body: string;
};
/**
 * @internal
 */
export declare function isArgOptional(argExpr: string): boolean;
/**
 * @internal
 */
export declare function getArgName(argExpr: string): string;