Extract IP address from ipconfig using Regex

Question

I would like to extract the IPv4 address only from the output below, after running ipconfig, using Regex.

    Connection-specific DNS Suffix  . : domain.local
    Link-local IPv6 Address . . . . . : fe80::49b6:17f6:f059:1c3d%12
    IPv4 Address. . . . . . . . . . . : 192.168.2.180
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 192.168.2.254

Therefore I would like to extract the '192.168.2.180' address only.

If you're in an environment where you can run regular expressions, chances are that there's a more direct way to obtain this information (probably in a neater/more "ready for whatever the next step of this process is" form) than by running the ipconfig command. — Damien_The_Unbeliever
– Damien_The_Unbeliever, Commented Jun 25, 2013 at 12:48
i connect remotely to a machine, via telnet and automatically run the IPCONFIG command. All i need is to extract the ip address. — David Faizulaev
– David Faizulaev, Commented Jun 25, 2013 at 12:51
By the time that the telnet command has connected to the remote machine, it's already had to find out the IP address. — Damien_The_Unbeliever
– Damien_The_Unbeliever, Commented Jun 25, 2013 at 12:52

Imanuel · Accepted Answer · 2013-06-25 12:47:13Z

4

^ *IPv4 Address[.\s]*:\s*([\d.]+)\s*$

It does not do any sanity checks on the IP address.

answered Jun 25, 2013 at 12:47

Imanuel

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2 Comments

David Faizulaev Over a year ago

@Pharaon can you assist with a Regex that gives me just the IP address, without the string of "IPv4 Address" ?

Imanuel Over a year ago

The regex pattern already groups the IP address. Check group #1 for its contents.

dav · Accepted Answer · 2013-06-25 12:47:51Z

1

There are better ways to parse IP addresses, but this one is simple and grabs only what you need:

http://rubular.com/r/PxEX4Lk56w

\s+IPv4 Address.*: ([\d\.]+)

answered Jun 25, 2013 at 12:47

dav

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4 Comments

David Faizulaev Over a year ago

can you assist with a Regex that gives me just the IP address, without the string of "IPv4 Address" ?

dav Over a year ago

What do you mean? Are you trying to parse a different string now? This and Pharoah's regex will both capture the IP address to a group, which is what you want.

David Faizulaev Over a year ago

using Pharoah's i get : "IPv4 Address. . . . . . . . . . . : 192.168.2.180" all i actually need is the address itself "192.168.2.180

dav Over a year ago

...no. What language are you using? You need to use capture groups to find the IP address alone. For example, in python this would be: re.match(string, regex).group(1).

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