import re


def is_color(s: str) -> bool:
    """
    Determine if ``s`` is a color hex in the format #RRGGBB.

    :param s: the string to check
    :return: ``True`` if ``s`` fits the pattern; ``False`` otherwise
    """
    return bool(re.match(r'^#[A-Fa-f0-9]{6}$', s))