Validate IP and substitute name's spaces with underscores

gistfile1.txt

# Taken from here: http://stackoverflow.com/questions/13015206/variables-validation-name-and-ip-address-in-bash

#!/bin/bash

read name
name=${name// /_}

read ip
if [[ "$ip" =~ ^([0-9]{1,3})[.]([0-9]{1,3})[.]([0-9]{1,3})[.]([0-9]{1,3})$ ]]
then
    for (( i=1; i<${#BASH_REMATCH[@]}; ++i ))
    do
      (( ${BASH_REMATCH[$i]} <= 255 )) || { echo "bad ip" >&2; exit 1; }
    done
else
      echo "bad ip" >&2
      exit 1;
fi

echo "name:$name"
echo "ip:$ip"




# From the same post:
unset name ip; \
while ! [ "$name" ] || ! [ "$ip" ];do
    printf "Name: %s\r" $name;
    read -p Name:\  var;
    [ "$var" ] && name=${var// /_};
    printf "IP: %s\r" $ip;
    read -p IP:\  var;
    iparray=($( IFS=".";echo $var;));
    [ ${#iparray[@]} -eq 4 ] && \
        [ $iparray -ge 0 ] && [ $iparray -le 255 ] && \
        [ ${iparray[1]} -ge 0 ] && [ ${iparray[1]} -le 255 ] && \
        [ ${iparray[2]} -ge 0 ] && [ ${iparray[2]} -le 255 ] && \
        [ ${iparray[3]} -ge 0 ] && [ ${iparray[3]} -le 255 ] && \
        ip=$var;
    [ "$name" ] && [ "$ip" ] || echo something wrong...;
  done; \
printf "Name: '%s'\nIP:   '%s'\n" $name $ip