Bash: awk removing parentheses from array items - bash

Question

So I'm creating a small network scan automation tool using nmap as part of the backend, when attempting to get hostnames and IP addresses the IP is formatted like this "(192.168.0.1)" currently I'm using this bit of code to grab hostname and IP and print.
devices=($( nmap $net_addr -sn | grep -E '([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})' | awk {' print $5 "\t" $6)'} ))
printf '%-10s %s\n' "${devices[#]}"
This code will print this
UNKNOWN (192.168.0.1)
UNKNOWN (192.168.0.3)
UNKNOWN (192.168.0.5)
UNKNOWN (192.168.0.6)
UNKNOWN (192.168.0.16)
UNKNOWN (192.168.0.18)
UNKNOWN (192.168.0.19)
UNKNOWN (192.168.0.21)
UNKNOWN (192.168.0.22)
UNKNOWN (192.168.0.23)
UNKNOWN (192.168.0.32)
UNKNOWN (192.168.0.253)
I attempted to use substr($6,2) but this only chops off the first bit and sadly as the nmap IP addresses are variable in length this doesn't help me.
In short, this is the desired output.
UNKNOWN 192.168.0.1
UNKNOWN 192.168.0.3
UNKNOWN 192.168.0.5
UNKNOWN 192.168.0.6
UNKNOWN 192.168.0.16
UNKNOWN 192.168.0.18
UNKNOWN 192.168.0.19
UNKNOWN 192.168.0.21
UNKNOWN 192.168.0.22
UNKNOWN 192.168.0.23
UNKNOWN 192.168.0.32
UNKNOWN 192.168.0.253
here is the output of nmap 192.168.0.0/24 -sn
Starting Nmap 7.40 ( https://nmap.org ) at 2017-12-31 14:42 UTC
Nmap scan report for UNKNOWN (192.168.0.1)
Host is up (0.0014s latency).
Nmap scan report for UNKNOWN (192.168.0.3)
Host is up (0.052s latency).
Nmap scan report for UNKNOWN (192.168.0.5)
Host is up (0.0065s latency).
Nmap scan report for UNKNOWN (192.168.0.6)
Host is up (0.0073s latency).
Nmap scan report for UNKNOWN (192.168.0.7)
Host is up (0.029s latency).
Nmap scan report for UNKNOWN (192.168.0.16)
Host is up (0.011s latency).
Nmap scan report for UNKNOWN (192.168.0.18)
Host is up (0.053s latency).
Nmap scan report for UNKNOWN (192.168.0.21)
Host is up (0.011s latency).
Nmap scan report for UNKNOWN (192.168.0.22)
Host is up (0.012s latency).
Nmap scan report for UNKNOWN (192.168.0.23)
Host is up (0.0061s latency).
Nmap scan report for UNKNOWN (192.168.0.32)
Host is up (0.0013s latency).
Nmap scan report for UNKNOWN (192.168.0.253)
Host is up (0.0011s latency).
Nmap done: 256 IP addresses (12 hosts up) scanned in 3.16 seconds

Answer 1

As per your shown Input you could try following single awk to get the shown expected output.
your_command | awk '/Nmap scan report/{gsub(/\)|\(/,"",$NF);print $(NF-1),$NF}'
EDIT: Eliminating grep from OP's command and trying to solve it within single awk itself now.
devices=$(nmap $net_addr -sn | awk --re-interval '{if(match($0,/\([0-9]{3}\.[0-9]{3}\.[0-9]{1,3}\.[0-9]{1,3}\)/)){gsub(/\)|\(/,"",$NF);print $(NF-1),$NF}}')
Also since my awk is OLD one in case you have latest version of awk then kindly don't use --re-interval in solution.

Answer 2

You can try this sed too
nmap $net_addr -sn | sed '/^Nmap scan report for /!d;s///;s/[)(]//g'