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Require input (non-empty string) in bash dialog box

Hello.

Any help would be greatly appreciated.

Right now I have the following input box that works fine and well, however I would like to wrap this is a loop that requires input. Right now the script will happily continue on if the user just hits enter. I'd like to require a minimum of a 5 digit number or n/a or N/A as the only viable options otherwise you should get prompted to re-enter information.

[CODE]

DIALOG=${DIALOG=dialog}
$DIALOG --title "RFC NUMBER" --clear \
--inputbox "Please enter an RFC Number" 16 17 2> $rfcfile

retval=$?
rfcval=`cat $rfcfile`

case $retval in
0)
echo RFC Number: "$rfcval" >> $accessfile;;
1)
exit 1;;
255)
rm -rf $accessfile && rm -rf $tempfile && rm -rf $rfcfile && rm -rf $sitefile && exit 1;;
esac

[/CODE]
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