How to validate IP address in bash

 
#Validating IP addess
if [[ "$ip_server" =~ ^([0-9]{1,3})[.]([0-9]{1,3})[.]([0-9]{1,3})[.]([0-9]{1,3})$ ]]
then
    for (( i=1; i<${#BASH_REMATCH[@]}; ++i ))
    do
      (( ${BASH_REMATCH[$i]} &2; exit 1; }
    done
else
      echo "Check the IP address" >&2
      exit 1;
fi