r"""Unescape markup again into an unicode string.  This also resolves
        known HTML4 and XHTML entities:

        >>> Markup("Main &raquo; <em>About</em>").unescape()
        u'Main \xbb <em>About</em>'

def unescape(self):
        r"""Unescape markup again into an unicode string.  This also resolves
        known HTML4 and XHTML entities:

        >>> Markup("Main &raquo; <em>About</em>").unescape()
        u'Main \xbb <em>About</em>'
        """
        from jinja2.constants import HTML_ENTITIES
        def handle_match(m):
            name = m.group(1)
            if name in HTML_ENTITIES:
                return unichr(HTML_ENTITIES[name])
            try:
                if name[:2] in ('#x', '#X'):
                    return unichr(int(name[2:], 16))
                elif name.startswith('#'):
                    return unichr(int(name[1:]))
            except ValueError:
                pass
            return u''
        return _entity_re.sub(handle_match, unicode(self))