在方法split返回的数组末尾获取空字符串

Question

var s = "Hello, how are you?";
var r = /([,\s?]+)/;
console.log(s.split(r));

为什么我在数组末尾得到一个空字符串？

Answer 1

删除\s之后的问号。

var s = "Hello, how are you?";
var r = /([,\s]+)/;
console.log(s.split(r));

Answer 2

因为您也在对问号进行拆分。没有它：

var s = "Hello, how are you?";
var r = /([,\s]+)/;
console.log(s.split(r));
// including question mark in the split
// and empty values removed from the result
console.log(s.split(/([,\s]+|[?])/).filter(v => v.length));