ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
74 lines
1.8 KiB
Markdown
74 lines
1.8 KiB
Markdown
---
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id: 587d7dbb367417b2b2512bab
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title: 使用捕获组搜索和替换
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challengeType: 1
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forumTopicId: 301368
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dashedName: use-capture-groups-to-search-and-replace
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---
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# --description--
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搜索功能是很有用的。但是，当搜索同时也执行更改（或替换）匹配文本的操作时，搜索功能就会显得更加强大。
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可以使用字符串上`.replace()`方法来搜索并替换字符串中的文本。`.replace()`的输入首先是想要搜索的正则表达式匹配模式，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。
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```js
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let wrongText = "The sky is silver.";
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let silverRegex = /silver/;
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wrongText.replace(silverRegex, "blue");
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// Returns "The sky is blue."
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```
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你还可以使用美元符号（`$`）访问替换字符串中的捕获组。
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```js
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"Code Camp".replace(/(\w+)\s(\w+)/, '$2 $1');
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// Returns "Camp Code"
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```
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# --instructions--
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编写一个正则表达式，以搜索字符串`"good"`。然后更新变量`replaceText`，用字符串`"okey-dokey"`替换`"good"`。
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# --hints--
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你应该使用`.replace()`搜索并替换。
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```js
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assert(code.match(/\.replace\(.*\)/));
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```
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你的正则表达式应该把`'This sandwich is good.'`变成`'This sandwich is okey-dokey.'`。
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```js
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assert(
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result == 'This sandwich is okey-dokey.' && replaceText === 'okey-dokey'
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);
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```
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你不应该改变最后一行。
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```js
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assert(code.match(/result\s*=\s*huhText\.replace\(.*?\)/));
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```
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# --seed--
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## --seed-contents--
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```js
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let str = "one two three";
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let fixRegex = /change/; // Change this line
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let replaceText = ""; // Change this line
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let result = str.replace(fixRegex, replaceText);
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```
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# --solutions--
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```js
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let str = "one two three";
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let fixRegex = /(\w+) (\w+) (\w+)/g; // Change this line
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let replaceText = "$3 $2 $1"; // Change this line
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let result = str.replace(fixRegex, replaceText);
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```
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