Regex to extract IP address from hyphenated string

Question

I have a string of text that contains an IP address with hyphens and words. I want to extract the IP address from it using a regular expression that also converts the hyphens to periods.

So to clarify, can the IP address be extracted and the hyphens be replaced with periods purely with a regular expression without using the regex in some code such as Java or Python:

What I have

ip-10-179-50-22.corp.dept.org.uk

What I want

10.179.50.22

I'm thinking that I need to extract 4 groups based on numbers and concatenate them with periods, but I have no idea how to do this or if this is even possible with only regex?

What I've tried

(\d{2,3}-\d{2,3}-\d{2,3}-\d{2,3})

This gives me back 10-179-50-22 but I don't know how to replace on the matching group.

EDIT

I edited the question to clarify that I was trying to find a solution to find and replace with only a regular expression.

In summary, it looks like you can't just use a regex, but the regex needs to used with some code to achieve this

Not sure I understand your comment @WiktorStribiżew - the section above called 'What I've tried' is my code attempt — linus1412
– linus1412, Commented Apr 4, 2022 at 18:06
How to replace is language-specific. Which language are you using? — MikeM
– MikeM, Commented Apr 4, 2022 at 18:06
There is only a regex string. Where are you using it? How? If you type the regex in Notepad++, it won't do anything, you need to put it into a specific field in a specific window. If you write it down on a Web page, but do not use it in any code, you won't get the job done either. Regex is a piece of text. It describes some specific text pattern. It depends on the code that uses the regex what it finally does. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Apr 4, 2022 at 18:06
I was attempting this on on regex101.com This will end up inside an ansible jinja2 file which I believe is interpreted by Python — linus1412
– linus1412, Commented Apr 4, 2022 at 18:12

Xavier Loubert · Accepted Answer · 2022-04-04 18:04:20Z

1

We don't know which language your using but a lot of them have a .replace() with which you could change - for . or event sub string with a bit of adjusting should work for your problem.

answered Apr 4, 2022 at 18:04

Xavier Loubert

113 bronze badges

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

2 Comments

linus1412 Over a year ago

Thanks for your answer. I was hoping for a pure regex to do this. Is it even possible?

Xavier Loubert Over a year ago

To my knowledge you still need a replace method() but it may vary between the technologies you might be using. Insight on your project might help use find a solution

MikeM · Accepted Answer · 2022-04-04 18:25:41Z

1

See regex101 example.

Regex:

.*\b(\d{2,3})-(\d{2,3})-(\d{2,3})-(\d{2,3})\b.*

Substitution:

\1.\2.\3.\4

Result:

10.179.50.22

Note that I am just using the regex you provided to match the IP address part, rather than a more accurate regex that would match any valid IP address.

answered Apr 4, 2022 at 18:25

MikeM

13.8k3 gold badges38 silver badges49 bronze badges

Comments

user9131524 · Accepted Answer · 2022-04-04 18:24:56Z

0

If you are able to use the sed command, this regex would do the job. It uses 4 groups like you suggested.

sed -i 's/^ip-\([0-9]*\)-\([0-9]*\)-\([0-9]*\)-\([0-9]*\).*/\1.\2.\3.\4/g'

It replaces ip-10-179-50-22.corp.dept.org.uk with 10.179.50.22. You can test it on https://sed.js.org.

answered Apr 4, 2022 at 18:24

user9131524

433 silver badges8 bronze badges

Collectives™ on Stack Overflow

Regex to extract IP address from hyphenated string

EDIT

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

EDIT

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related