字符串的findall 拿去不谢

def _findall(partten: str, body: str, start=0, res=None) -> list:
    """  find  partten from strings   """
    if res == None:
        res = []
    pos = body.find(partten)
    length = len(partten)
    if pos >= 0:
        l = start + pos
        r = l + length
        res.append((l, r))
        body = body[pos + len(partten):]
        _findall(partten, body, r, res)
        return res
    else:
        return []