57 lines
2.4 KiB
Markdown
57 lines
2.4 KiB
Markdown
---
|
||
id: 587d7dbb367417b2b2512bab
|
||
title: Use Capture Groups to Search and Replace
|
||
challengeType: 1
|
||
videoUrl: ''
|
||
localeTitle: 使用捕获组进行搜索和替换
|
||
---
|
||
|
||
## Description
|
||
<section id="description">搜索很有用。但是，当它也更改（或替换）您匹配的文本时，您可以使搜索功能更强大。您可以在字符串上使用<code>.replace()</code>搜索和替换字符串中的文本。 <code>.replace()</code>的输入首先是您要搜索的正则表达式模式。第二个参数是用于替换匹配的字符串或用于执行某些操作的函数。 <blockquote> let wrongText =“天空是银色的。”; <br>让silverRegex = / silver /; <br> wrongText.replace（silverRegex，“blue”）; <br> //返回“天空是蓝色的”。 </blockquote>您还可以使用美元符号（ <code>$</code> ）访问替换字符串中的捕获组。 <blockquote> “Code Camp”.replace（/（\ w +）\ s（\ w +）/，'$ 2 $ 1'）; <br> //返回“营地代码” </blockquote></section>
|
||
|
||
## Instructions
|
||
<section id="instructions">写一个正则表达式，以便它搜索字符串<code>"good"</code> 。然后更新<code>replaceText</code>变量，将<code>"good"</code>替换为<code>"okey-dokey"</code> 。 </section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: 您应该使用<code>.replace()</code>来搜索和替换。
|
||
testString: 'assert(code.match(/\.replace\(.*\)/), "You should use <code>.replace()</code> to search and replace.");'
|
||
- text: 你的正则表达式应该改变<code>"This sandwich is good."</code> <code>"This sandwich is okey-dokey."</code>
|
||
testString: 'assert(result == "This sandwich is okey-dokey." && replaceText === "okey-dokey", "Your regex should change <code>"This sandwich is good."</code> to <code>"This sandwich is okey-dokey."</code>");'
|
||
- text: 你不应该改变最后一行。
|
||
testString: 'assert(code.match(/result\s*=\s*huhText\.replace\(.*?\)/), "You should not change the last line.");'
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='js-seed'>
|
||
|
||
```js
|
||
let huhText = "This sandwich is good.";
|
||
let fixRegex = /change/; // Change this line
|
||
let replaceText = ""; // Change this line
|
||
let result = huhText.replace(fixRegex, replaceText);
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
```js
|
||
// solution required
|
||
```
|
||
</section>
|