如何将字符串拆分为 n 个字符的段? [英] How can I split a string into segments of n characters?

问题描述

正如标题所说，我有一个字符串，我想分成 n 个字符的片段.

As the title says, I've got a string and I want to split into segments of n characters.

例如:

var str = 'abcdefghijkl';

经过n=3的一些魔法后，它会变成

after some magic with n=3, it will become

var arr = ['abc','def','ghi','jkl'];

有没有办法做到这一点?

Is there a way to do this?

推荐答案

var str = 'abcdefghijkl';
console.log(str.match(/.{1,3}/g));

注意: 使用 {1,3} 而不是 {3} 来包含不是字符串长度的余数3 的倍数，例如:

Note: Use {1,3} instead of just {3} to include the remainder for string lengths that aren't a multiple of 3, e.g:

console.log("abcd".match(/.{1,3}/g)); // ["abc", "d"]

还有一些微妙之处:

1. 如果您的字符串可能包含换行符(您想将其视为一个字符而不是拆分字符串)，那么 . 将不会捕获这些.使用 /[\s\S]{1,3}/ 代替.(感谢@Mike).
2. 如果您的字符串为空，那么当您期望一个空数组时，match() 将返回 null.通过附加 || 来防止这种情况[].

1. If your string may contain newlines (which you want to count as a character rather than splitting the string), then the . won't capture those. Use /[\s\S]{1,3}/ instead. (Thanks @Mike).
2. If your string is empty, then match() will return null when you may be expecting an empty array. Protect against this by appending || [].

所以你可能会得到:

var str = 'abcdef \t\r\nghijkl';
var parts = str.match(/[\s\S]{1,3}/g) || [];
console.log(parts);

console.log(''.match(/[\s\S]{1,3}/g) || []);

这篇关于如何将字符串拆分为 n 个字符的段?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！