Regex: How to match IP address in RFC1918 private IPV4 address ranges (in Python)?

The following regexp should work:

^(?:10|127|172\.(?:1[6-9]|2[0-9]|3[01])|192\.168)\..*

DEMO

from : https://stackoverflow.com/questions/30674845/regex-how-to-match-ip-address-in-rfc1918-private-ipv4-address-ranges-in-python