Regular Expression : example1

#!/bin/bash

REG="^[a-z]{0,3}[0-9]{2,8}[A-Z]{3,}\$"
read N

if [ $N -gt 0 ] && [ $N -le 100 ]; then
for((i=0;i<$N;i++))
do
read STR
if [[ $STR =~ $REG ]];then
echo "VALID"
else echo "INVALID"
fi
done
fi