/**
	 * Search inside a string
	 *
	 * @param   string    $value   The string value
	 *
	 * @return  string|null    The marked string if found, else null
	 * @since 3.2.0
	 */
	public function string(string $value): ?string;

	/**
	 * Replace found instances inside string value
	 *
	 * @param   string     $value      The string value to update
	 *
	 * @return  string      The updated string
	 * @since 3.2.0
	 */
	public function replace(string $value): string;