def parse_bnd_pos(alt):
    """
    Parses standard VCF BND ALT (e.g. N]1:1000]) into chrom, pos

    Parameters
    ----------
    alt : str
        VCF-formatted BND ALT

    Returns
    -------
    chrom : str
    pos : int
    """
    alt = alt.strip('ATCGNRYSWKMBDHV')
    # Strip brackets separately, otherwise GL contigs will be altered
    alt = alt.strip('[]')

    # HLA contigs include colons, so be careful when parsing
    data = alt.split(':')
    chr2 = ':'.join(data[:-1]).replace("CHR","chr")
    end = int(data[-1])

    return chr2, end