def colon():
    """Colon case.

    Match a colon ":" only if not preceeded by a digit.
    Mainly to prevent a cut in the middle of time notations e.g. 10:01

    """
    return RegexBuilder(
        pattern_args=symbols.COLON,
        pattern_func=lambda x: r"(?<!\d){}".format(x)).regex
Colon case.

    Match a colon ":" only if not preceeded by a digit.
    Mainly to prevent a cut in the middle of time notations e.g. 10:01