regex ip address from string

Question

gcc 4.6.2 c89

Is there any standard regex expression that can be used to extract the IP address from a string.

I am thinking about using sscanf with a regex expression to get the IP from this sample string below.

This is the sample string:

v=0 o=sip_user IN 10230 22472 IP4 NET.CAT.NTBC s=SIP_CALL c=IN IP4 10.10.10.44 m=audio 49152 RTP/AVP 0 a=rtpmap:0 PCMU/8000

So the regex will be in between the quotes:

sscanf(ip_string, "%s", &ip_address);

Many thanks for any suggestions,

sscanf() doesn't take a regex.

Lily Ballard
– Lily Ballard

2011-12-09 00:30:45 +00:00
Commented Dec 9, 2011 at 0:30 — Lily Ballard
– Lily Ballard, Commented Dec 9, 2011 at 0:30

Bhargav Rao · Accepted Answer · 2017-12-15 05:45:29Z

4

\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b

edited Dec 15, 2017 at 5:45

Bhargav Rao

52.6k29 gold badges130 silver badges142 bronze badges

answered Dec 9, 2011 at 0:41

Prafulla

1,9491 gold badge17 silver badges21 bronze badges

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

1 Comment

ant2009 Over a year ago

Hello. Thanks I did see that regular regex expression. But my problem is how can I get that to work in c? What standard c function do I insert it? Many thanks.

Bort · Accepted Answer · 2011-12-09 01:58:40Z

1

Check your OS for regex.h and use the defined regular expression library. e.g. linux example

answered Dec 9, 2011 at 1:58

Bort

2,49115 silver badges24 bronze badges

Comments

Scene · Accepted Answer · 2024-10-29 11:45:16Z

1

Here is a short concise and easy-to-read regex with 34 characters:

^(25[0-5]|2[0-4]\d|[01]?\d\d?\.?){4}$

This is matching only numbers between 0 to 255.

answered Oct 29, 2024 at 11:45

Scene

3152 silver badges7 bronze badges

Collectives™ on Stack Overflow

regex ip address from string

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related