Validate an IP address using ReGex

# Validate IP addresses using Regex
import re
 
# Function for Validating IP
 
 
def validateIP(IP):
 
    # Regex expression for validating IPv4
    regexIP4 = "^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])$"
 
    # Regex expression for validating IPv6
    regexIP6 = "((([0-9a-fA-F]){1,4})\\:){7}"\
             "([0-9a-fA-F]){1,4}"
 
    isIP4 = re.compile(regexIP4)
    isIP6 = re.compile(regexIP6)
 
    # Checking if it is a valid IPv4 addresses
    if (re.search(isIP4, IP)):
        return "This is a valid IPv4"
 
    # Checking if it is a valid IPv6 addresses
    elif (re.search(isIP6, IP)):
        return "This is a valid IPv6"
 
    # Return Invalid
    return "This is an invalid IP"
 
# Driver Code
 
# IP addresses to validate
IP = "127.0.0.1"
print(validateIP(IP))

IP = "201.23.120.21"
print(validateIP(IP))
 
IP = "2001:db8:85a3:8d3:1319:8a2e:370:7348"
print(validateIP(IP))
 
IP = "This.is.an.ip"
print(validateIP(IP))

# Validate IP addresses using Regex

import re

# Function for Validating IP

def validateIP(IP):

    # Regex expression for validating IPv4

    regexIP4 = "^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])$"

    # Regex expression for validating IPv6

    regexIP6 = "((([0-9a-fA-F]){1,4})\\:){7}"\

             "([0-9a-fA-F]){1,4}"

    isIP4 = re.compile(regexIP4)

    isIP6 = re.compile(regexIP6)

    # Checking if it is a valid IPv4 addresses

    if (re.search(isIP4, IP)):

        return "This is a valid IPv4"

    # Checking if it is a valid IPv6 addresses

    elif (re.search(isIP6, IP)):

        return "This is a valid IPv6"

    # Return Invalid

    return "This is an invalid IP"

# Driver Code

# IP addresses to validate

IP = "127.0.0.1"

print(validateIP(IP))

​

IP = "201.23.120.21"

print(validateIP(IP))

IP = "2001:db8:85a3:8d3:1319:8a2e:370:7348"

print(validateIP(IP))

IP = "This.is.an.ip"

print(validateIP(IP))

​