How to use the pyregion.ds9_region_parser.RegionParser function in pyregion

def parse(region_string):
    """Parse DS9 region string into a ShapeList.

    Parameters
    ----------
    region_string : str
        Region string

    Returns
    -------
    shapes : `ShapeList`
        List of `~pyregion.Shape`
    """
    rp = RegionParser()
    ss = rp.parse(region_string)
    sss1 = rp.convert_attr(ss)
    sss2 = _check_wcs(sss1)

    shape_list, comment_list = rp.filter_shape2(sss2)
    return ShapeList(shape_list, comment_list=comment_list)

def read_region_as_imagecoord(s, header):
    """Read region as image coordinates.

    Parameters
    ----------
    s : str
        Region string
    header : `~astropy.io.fits.Header`
        FITS header

    Returns
    -------
    shapes : `~pyregion.ShapeList`
        List of `~pyregion.Shape`
    """
    rp = RegionParser()
    ss = rp.parse(s)
    sss1 = rp.convert_attr(ss)
    sss2 = _check_wcs(sss1)
    sss3 = rp.sky_to_image(sss2, header)

    shape_list = rp.filter_shape(sss3)
    return ShapeList(shape_list)

def read_region(s):
    """Read region.

    Parameters
    ----------
    s : str
        Region string

    Returns
    -------
    shapes : `ShapeList`
        List of `~pyregion.Shape`
    """
    rp = RegionParser()
    ss = rp.parse(s)
    sss1 = rp.convert_attr(ss)
    sss2 = _check_wcs(sss1)

    shape_list = rp.filter_shape(sss2)
    return ShapeList(shape_list)