@classmethod
def do_unescape(cls, txt):
    """Replace escaped chars by real ones!"""
    if '\\n' in txt:
        txt = txt.replace('\\n', '\n')
    if '\\t' in txt:
        txt = txt.replace('\\t', '\t')
    if '\\"' in txt:
        txt = cls._unesc_quotes.sub('\\1"', txt)
    return txt
