a ? b /xyz/123/acb /xyz/acb/123
matchBase If set, patterns without slashes will be matched against the basename of the path if it contains slashes. For example, a?b would match the path /xyz/123/acb, but not /xyz/acb/123.
引自gruntAPI,翻译过来的意思应该是如果设置了matchBase,则会匹配底层路径,即abc之后不带斜杠,而不会匹配带了斜杠的。
如果不对,烦请指正。