Python regex removing port number from IP string

Question

I have text file which contains lines of text and IPs with port number and I want to remove port number and print just IP.

Example text file:

77.55.211.77:8080
NoIP
79.127.57.42:80

Desired output:

77.55.211.77
79.127.57.42

My code:

import re

with open('IPs.txt', 'r') as infile: 
    for ip in infile:
        ip = ip.strip('\n')
        IP_without_port_number = re.sub(r'((?::))(?:[0-9]+)$', "", ip)
        re_for_IP = re.match(r'^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$',ip)
        print(IP_without_port_number)

I am not understand why I see all lines as output when I am printing to console "IP_without_port_number"

Aviv Yaniv · Accepted Answer · 2020-09-16 09:44:18Z

3

All you need is the second match:

import re

with open('IPs.txt', 'r') as infile:
    for ip in infile:
        re_for_IP = re.match(r'(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})', ip)
        if re_for_IP:
            print(re_for_IP[0])

Output:

77.55.211.77
79.127.57.42

One-liner:

import re

ips = []

with open('IPs.txt', 'r') as infile:
    ips = [ip[0] for ip in [re.match(r'(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})', ip) for ip in infile] if ip]

print(ips)

edited Sep 16, 2020 at 9:44

answered Sep 16, 2020 at 9:37

Aviv Yaniv

6,3063 gold badges9 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

ranu · Accepted Answer · 2020-09-16 09:36:20Z

0

You don't need regex, use the split function on the : character when reading the line. Then you would be left with an array with two positions, the first containing only the IP address and the other containing the port.

answered Sep 16, 2020 at 9:36

ranu

66215 silver badges25 bronze badges

Comments

Subasri sridhar · Accepted Answer · 2020-09-16 09:45:34Z

0

Try this:

import re
regex = '''^(25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.( 
            25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.( 
            25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.( 
            25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)$'''

with open('IP.txt', 'r') as infile: 
    for ip in infile:
        ip = ip.strip('\n')
        IP_without_port_number = re.sub(r':.*$', "", ip)
        re_for_IP = re.match(r'^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$',ip)
        if(re.search(regex, IP_without_port_number)):  
            print(IP_without_port_number)

Output:

77.55.211.77
79.127.57.42

answered Sep 16, 2020 at 9:45

Subasri sridhar

8416 silver badges16 bronze badges

Comments

SomeOne · Accepted Answer · 2020-09-16 10:35:41Z

0

I came up wit this regex code, it works for me and its easy.

import re
text = input("Input text: ")
pattern = re.findall(r'\d+\.\d+\.\d+\.\d+', text)
print(pattern)

edited Sep 16, 2020 at 10:35

answered Sep 16, 2020 at 10:30

SomeOne

292 bronze badges

Collectives™ on Stack Overflow

Python regex removing port number from IP string

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related