# Regular filtering of Intranet addresses and segments

2022-04-23 16:40:59 GokuCode

## 1. Problem description

I want to filter out ABC Intranet address and CIDR Format Intranet IP paragraph
Mainly the following paragraphs

## 2. solve the problem

Regular expressions ：

``````^(10\.\d{
1,3}\.\d{
1,3}\.((0\/(|1[0-9]|2\d|3))|(\d{
1,3})))|(172\.(1|2\\d|3)\.\d{
1,3}\.\d{
1,3}(\/(1|2\d|3))?)|(192\.168\.\d{
1,3}\.\d{
1,3}(\/(1|2\d|3))?)\$
``````

Python give an example

``````# ABC Intranet address detection
def check_intranet_ip_segment(ip):
'''  matching  1.A Class address :10.0.0.0~10.255.255.255 2.B Class address :172.16.0.0~172.31.255.255 3.C Class address :192.168.0.0~192.168.255.255  Match successfully returns True, conversely False '''
result = re.match(r'^(10\.\d{1,3}\.\d{1,3}\.((0\/(|1[0-9]|2\d|3))|(\d{1,3})))|(172\.(1|2\\d|3)\.\d{1,3}\.\d{1,3}(\/(1|2\d|3))?)|(192\.168\.\d{1,3}\.\d{1,3}(\/(1|2\d|3))?)\$', ip)
if result:
return True
else:
return False
``````

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