glob的目录/和目录/*和目录/**和目录/**/*有什么区别？

Question

我正在使用gulp构建我的开发工作流程。Gulp及其插件大量使用glob。

我对以下内容之间的区别感到困惑：

directory/ 
directory/* 
directory/** 
directory/**/*

我不能让gulp做我想要的事情。

Answer 1

Grunt很好地解释了globs的工作原理http://gruntjs.com/configuring-tasks#globbing-patterns

* matches any number of characters, but not /
** matches any number of characters, including /, as long as it's the only thing
   in a path part. So a/**/b will match a/x/y/b, but a/**b will not.

directory/ = this isn't a glob and would evaluate as expected.
directory/* = will match anything in the directory, but not sub-directories.
directory/** = will match anything in the directory and all subdirectories.
directory/**/* = will match anything in the directory and all subdirectories. 
                 (good for adding a prefix like an extension to the end)