re sub

_XHTML_ESCAPE_RE = re.compile('[&<>"\']')_XHTML_ESCAPE_DICT = {'&': '&', '<': '<', '>': '>', '"': '"',                      '\'': '''}def xhtml_escape(value):    """Escapes a string so it is valid within HTML or XML."""    return _XHTML_ESCAPE_RE.sub(lambda match: _XHTML_ESCAPE_DICT[match.group(0)],                                to_basestring(value))