说一个字符串可能是“a b”c“d”，我怎么能检查字符串中是否包含单/双引号和空格？
case "$var" in
*\ * )
echo "match"
;;
*)
echo "no match"
;;
esac
case "$var" in
*\ * )
echo "match"
;;
*)
echo "no match"
;;
esac
