How to use the markdown2._memoized function in markdown2

(?:
            (?<=\n\n)       # Starting after a blank line
            |               # or
            \A\n?           # the beginning of the doc
        )
        (                       # save in \1
            [ ]{0,%d}
            <(hr)               # start tag = \2
            \b                  # word break
            ([^<>])*?           #
            /?>                 # the matching end tag
            [ \t]*
            (?=\n{2,}|\Z)       # followed by a blank line or end of document
        )
        """ % (tab_width - 1), re.X)
_hr_tag_re_from_tab_width = _memoized(_hr_tag_re_from_tab_width)


def _xml_escape_attr(attr, skip_single_quote=True):
    """Escape the given string for use in an HTML/XML tag attribute.

    By default this doesn't bother with escaping `'` to `'`, presuming that
    the tag attribute is surrounded by double quotes.
    """
    escaped = _AMPERSAND_RE.sub('&', attr)

    escaped = (attr
        .replace('"', '"')
        .replace('<', '<')
        .replace('>', '>'))
    if not skip_single_quote:
        escaped = escaped.replace("'", "'")

(?<=\n\n)       # Starting after a blank line
            |               # or
            \A\n?           # the beginning of the doc
        )
        (                           # save in $1
            [ ]{0,%d}
            (?:
                <\?\w+\b\s+.*?\?>   # XML processing instruction
                |
                <\w+:\w+\b\s+.*?/>  # namespaced single tag
            )
            [ \t]*
            (?=\n{2,}|\Z)       # followed by a blank line or end of document
        )
        """ % (tab_width - 1), re.X)
_xml_oneliner_re_from_tab_width = _memoized(_xml_oneliner_re_from_tab_width)

def _hr_tag_re_from_tab_width(tab_width):
     return re.compile(r"""
        (?:
            (?<=\n\n)       # Starting after a blank line
            |               # or
            \A\n?           # the beginning of the doc
        )
        (                       # save in \1
            [ ]{0,%d}
            <(hr)               # start tag = \2
            \b                  # word break
            ([^<>])*?           # 
            /?>                 # the matching end tag
            [ \t]*
            (?=\n{2,}|\Z)       # followed by a blank line or end of document

(?:
            (?<=\n\n)       # Starting after a blank line
            |               # or
            \A\n?           # the beginning of the doc
        )
        (                       # save in \1
            [ ]{0,%d}
            <(hr)               # start tag = \2
            \b                  # word break
            ([^<>])*?           # 
            /?>                 # the matching end tag
            [ \t]*
            (?=\n{2,}|\Z)       # followed by a blank line or end of document
        )
        """ % (tab_width - 1), re.X)
_hr_tag_re_from_tab_width = _memoized(_hr_tag_re_from_tab_width)


def _xml_escape_attr(attr, skip_single_quote=True):
    """Escape the given string for use in an HTML/XML tag attribute.
    
    By default this doesn't bother with escaping `'` to `'`, presuming that
    the tag attribute is surrounded by double quotes.
    """
    escaped = (attr
        .replace('&', '&')
        .replace('"', '"')
        .replace('<', '<')
        .replace('>', '>'))
    if not skip_single_quote:
        escaped = escaped.replace("'", "'")
    return escaped

(?<=\n\n)       # Starting after a blank line
            |               # or
            \A\n?           # the beginning of the doc
        )
        (                           # save in $1
            [ ]{0,%d}
            (?:
                <\?\w+\b\s+.*?\?>   # XML processing instruction
                |
                <\w+:\w+\b\s+.*?/>  # namespaced single tag
            )
            [ \t]*
            (?=\n{2,}|\Z)       # followed by a blank line or end of document
        )
        """ % (tab_width - 1), re.X)
_xml_oneliner_re_from_tab_width = _memoized(_xml_oneliner_re_from_tab_width)


def _hr_tag_re_from_tab_width(tab_width):
    return re.compile(r"""
        (?:
            (?<=\n\n)       # Starting after a blank line
            |               # or
            \A\n?           # the beginning of the doc
        )
        (                       # save in \1
            [ ]{0,%d}
            <(hr)               # start tag = \2
            \b                  # word break
            ([^<>])*?           #
            /?>                 # the matching end tag
            [ \t]*