Shell case正則匹配法

Shell case正則匹配法   case $BOOLEAN in [yY][eE][sS]) echo 'Thanks' $BOOLEAN ;; [yY]|[nN]) echo 'Thanks' $BOOLEAN ;; 'T'|'F') echo 'Thanks' $BOOLEAN ;; [Tt]ure|[Ff]alse) echo 'Thanks' $BOOLEAN ;; *) exit 1 ;; esac