regex question cant exclude number range

upthehill · 01-22-2015, 08:46 PM

ip add show| awk '!/'inet6\|link\|valid\|BROADCAST\|lo:\|$127\|172\|10.0.[2-4]$'/','/inet / {ip = $2; print ip}'| cut -d / -f1
returns

10.0.1.5

but I want to exclude 172.15-31 but I can’t get it to ?

What am I doing wrong ?

[peterpicked@mylaptop ~]$ ip add show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:14:8e:03:64:38 brd ff:ff:ff:ff:ff:ff
inet6 fe80::218:8bff:fe03:6438/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
link/ether 00:0a:cd:1c:ed:18 brd ff:ff:ff:ff:ff:ff
4: eth0.10@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 00:14:8e:03:64:38 brd ff:ff:ff:ff:ff:ff
inet 10.0.1.5/24 brd 10.0.1.255 scope global eth0.10
inet6 fe80::218:8bff:fe03:6438/64 scope link
valid_lft forever preferred_lft forever
5: eth0.20@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 00:14:8e:03:64:38 brd ff:ff:ff:ff:ff:ff
inet 10.0.2.5/24 brd 10.0.2.255 scope global eth0.20
inet6 fe80::218:8bff:fe03:6438/64 scope link
valid_lft forever preferred_lft forever
6: eth0.30@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 00:14:8e:03:64:38 brd ff:ff:ff:ff:ff:ff
inet 10.0.3.5/24 brd 10.0.3.255 scope global eth0.30
inet6 fe80::218:8bff:fe03:6438/64 scope link
valid_lft forever preferred_lft forever
7: eth0.40@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 00:14:8e:03:64:38 brd ff:ff:ff:ff:ff:ff
inet 10.0.4.5/24 brd 10.0.4.255 scope global eth0.40
inet6 fe80::218:8bff:fe03:6438/64 scope link
valid_lft forever preferred_lft forever
8: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
link/ether e2:c9:6b:e2:e5:91 brd ff:ff:ff:ff:ff:ff
inet 172.17.42.1/16 scope global docker0
inet6 fe80::e0c9:6bff:fee2:e591/64 scope link
valid_lft forever preferred_lft forever
[peterpicked@mylaptop ~]$

sudowtf · 01-23-2015, 07:58 AM

it works for me with your data. do you mean you want to "include"? if so remove "\|172" from your command.

upthehill · 01-24-2015, 09:22 AM

if for example a 172.1.x.x was listed I want it to display but if a 172.15.x.x through to 172.31.x.x was found it would exclude.

I thought I could do

ip add show| awk '!/'inet6\|link\|valid\|BROADCAST\|lo:\|$127\|172.[15-31]\|10.0.[2-4]$'/','/inet / {ip = $2; print ip}'| cut -d / -f1

but its not working.

RegexMaster · 01-25-2015, 11:41 AM

First you need to generate regex for numeric range. For example with my web app you can get it for 15-31 . The result is

Quote:

Code:

/(?:(?:(?:1[5-9])|(?:2[0-9])|(?:3[0-1])))/

.
Then add it with grep at the end. With your example it will be something like

Quote:

Code:

ip add show| awk '!/'inet6\|link\|valid\|BROADCAST\|lo:\|\(127\|172\|10.0.[2-4]\)'/','/inet / {ip = $2; print ip}'| cut -d / -f1 | grep -vP '^172\.(?:(?:(?:1[5-9])|(?:2[0-9])|(?:3[0-1])))'

The idea is to use "invert matching" after you get those ip's.