使用与分割相同的分隔符连接字符串 [英] Join the string with same separator used to split

问题描述

我有一个字符串，需要使用正则表达式进行拆分才能进行一些修改.

I have a string that need to be split with a regular expression for applying some modifications.

例如:

const str = "Hello+Beautiful#World";
const splited = str.split(/[\+#]/)

// ["Hello", "Beautiful", "World"]

现在，该字符串已使用 + 或#进行了拆分.现在说，对数组中的项目进行一些修改之后，我必须使用与拆分相同的分隔符来加入数组，因此字符 + 和#必须和以前一样.

Now the string has been split with + or #. Now say after applying some modification to the items in the array, I have to join the array using the same separator that used to split, so the character + and # has to be in the same position as before.

例如:如果我应用了一些修改字符串并加入了.那应该是.

eg: if i applied some modification string and joined. Then it should be.

Hello001+Beutiful002#World003

我该怎么做?

推荐答案

将模式放置在捕获组中时， split 会将匹配的定界符作为偶数数组项返回.因此，您所需要做的就是修改奇数项:

When you place a pattern inside a capturing group, split will return the matched delimiters as even array items. So, all you need to do is modify the odd items:

var counter=1;
var str = "Hello+Beautiful#World";
console.log(
  str.split(/([+#])/).map(function(el, index){
    return el + (index % 2 === 0 ? (counter++ + "").padStart(3, '0') : '');
  }).join("")
);

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