$ for b in configb configb1 configb2 configb_test;
do
  echo $b $(DB_NAME=$b; echo '%%configcommon' | sed -e "s/%%configcommon/${DB_NAME/configb@(1|2|)/configcommon}/g" )
done
configb configcommon
configb1 configcommon
configb2 configcommon
configb_test configcommon_test