Shell Programming and Scripting

ex_byte=bb21
if [[ ${ex_byte} != +([A-Z0-9]) ]]; then
    echo "Error"
fi

#!/usr/bin/ksh

while read I; do
        case $I in
                +([A-Z0-9]))    echo "ok";;
                *)              echo "err";;
        esac
done

exit 0

 
read STR
if [[ $STR = +([A-Z0-9]) ]] ; then
echo "Fine"
else
echo "error"
fi

#!/bin/bash
# bash 3.2+
ex_byte=bb32
if [[ $ex_byte =~ [a-z] ]];then
    echo "Not ok"
elif [[ $ex_byte =~ [A-Z]+[0-9]+|[0-9]+[A-Z]+ ]]  ; then
    echo "ok"
fi

#!/bin/bash
# bash 3.2+
ex_byte=bb32
if [[ $ex_byte =~ [a-z] ]];then
    echo "Not ok"
elif [[ $ex_byte =~ [A-Z]+[0-9]+|[0-9]+[A-Z]+ ]]  ; then
    echo "ok"
fi