def get_grapheme_cluster_break_property(value, is_bytes=False):
    """Get `GRAPHEME CLUSTER BREAK` property."""

    obj = unidata.ascii_grapheme_cluster_break if is_bytes else unidata.unicode_grapheme_cluster_break

    if value.startswith('^'):
        negated = value[1:]
        value = '^' + unidata.unicode_alias['graphemeclusterbreak'].get(negated, negated)
    else:
        value = unidata.unicode_alias['graphemeclusterbreak'].get(value, value)

    return obj[value]
Get `GRAPHEME CLUSTER BREAK` property.