类似地，如果输入两个逗号作为用户数据，那么列表中该位置的通道出口将获取由空白字符串组成的用户数据。
Similarly, if a double comma is entered as user data, then the channel exit at that position in the list will get user data consisting of a blank String.
可以使用逗号分隔的路径指定其他位置，包括嵌套jars的路径，例如，Meta - persistence： jpa . xml, persistence . jar ！
Other locations can be specified using comma separated paths, including paths into nested jars, for example, Meta-Persistence: jpa.
regex 将在所有出现逗号（这是位于 regex 开头的逗号）的位置做出断言：“前面是不是没有引号或者前面的引号个数是否为偶数”？
The regex makes an assertion at every occurrence of a comma (that's the comma at the very beginning of the regex): "Are no quotes ahead or is an even number of quotes ahead?"
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