python正则如何匹配ip地址

如何使用正则匹配合法ip

每一段ip的情况

只有1个数字：\d\b

只有2个数字：[1-9]\d\b

只有3个数字：1\d\d\b|2[0-4]\d\b|25[0-5]\b

re.match(r"((\d\b|[1-9]\d\b|1\d\d\b|2[0-4]\d\b|25[0-5])\b\.){3}(\d\b|[1-9]\d\b|1\d\d\b|2[0-4]\d\b|25[0-5]\b)","189.9.1.89")