Javascript拆分可以保留拆分值吗?

问题描述

在 JavaScript 中:

In Javascript :

var myString = "This is my string";

console.log(myString.split(/(\s)/));

输出:["This", " ", "is", " ", "my", " ", "string"]

console.log(myString.split(/\s/));

输出:["This", "is", "my", "string"]

为什么会这样?

推荐答案

您使用的两个正则表达式只是略有不同.

The two regexs you're using are only slightly different.

/(\s)/ 有一个 \s 捕获组，所以当与 split() 一起使用时，它会添加任何东西在捕获组中找到数组.

/(\s)/ has a capture group of \s, so when used with split() it will add the anything found in the capture group to the array.

正则表达式 /\s/ 没有捕获组，所以 split() 忽略匹配并且不将它们添加到数组中.

The regex /\s/ has no capture group, so split() ignores the matches and does not add them to the array.

同样，如果你执行:

var myString = "This is my string";

console.log(myString.split(/(my)/));  //includes matched capture group in results
console.log(myString.split(/my/));  //ignores matches

将输出:

["这是", "我的", "字符串"]
["这是","字符串"]

希望有帮助！

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