#！/usr/bin/env python

# -*- coding:utf-8 -*-

import re

ip_str = "asdad1.1.1.1sdfwe2.6.5.7sdfsf2.3.94.5sdf200.198.25.0"

res = []

for i in range(1):  

    ip_t = True

    m_ind = 0

    while ip_t:

        m = re.search(r"(((2([0-4]\d|5[0-5])|((1\d|[1-9])?\d)|\d)\.){3}(2([0-4]\d|5[0-5])|(1\d|[1-9])?\d|\d))",ip_str[m_ind:])

        if m:

            msum = m.group()

            res.append(msum)

            m_ind = ip_str.index(msum) + len(msum) -1

        else:

            ip_t = False  

print(res)

#print(msum,m_ind)  

cat abc | grep -Po "(^10\.(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|[0-9])\.(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|[0-9])\.(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|[0-9])$)|(^172\.(1[6789]|2[0-9]|3[01])\.(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|[0-9])\.(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|[0-9])$)|(^192\.168\.(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|[0-9])\.(1\d{2}|2[0-4]\d|25[0-5]|[1-9]\d|[0-9])$)"