@classmethod
def tag_lines(cls, string, tag, is_re=False):
    """Get lines matching tag.

        :returns: list of tag lines.

        See :meth:`tag_split`.
        """
    result = []
    for section in cls.tag_split(string, tag, is_re):
        if section[0]:
            result.append(section[1])
    return result
