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>
85 lines
2.3 KiB
Markdown
85 lines
2.3 KiB
Markdown
---
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id: 587d7db5367417b2b2512b95
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title: 将单个字符与多种可能性匹配
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challengeType: 1
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forumTopicId: 301357
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dashedName: match-single-character-with-multiple-possibilities
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---
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# --description--
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已经了解了文字匹配模式（`/literal/`）和通配符（`/./`）。这是正则表达式的两种极端情况，一种是精确匹配，而另一种则是匹配所有。在这两种极端情况之间有一个平衡选项。
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可以使用`字符集`搜寻具有一定灵活性的文字匹配模式。可以把字符集放在方括号（`[`和`]`）之间来定义一组需要匹配的字符串。
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例如，如果想要匹配`"bag"`、`"big"`和`"bug"`，但是不想匹配`"bog"`。可以创建正则表达式`/b[aiu]g/`来执行此操作。`[aiu]`是只匹配字符`"a"`、`"i"`或者`"u"`的字符集。
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```js
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let bigStr = "big";
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let bagStr = "bag";
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let bugStr = "bug";
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let bogStr = "bog";
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let bgRegex = /b[aiu]g/;
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bigStr.match(bgRegex); // Returns ["big"]
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bagStr.match(bgRegex); // Returns ["bag"]
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bugStr.match(bgRegex); // Returns ["bug"]
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bogStr.match(bgRegex); // Returns null
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```
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# --instructions--
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使用元音字符集（`a`、`e`、`i`、`o`、`u`）在正则表达式`vowelRegex`中匹配到字符串`quoteSample`中的所有元音。
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**注意**
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一定要同时匹配大小写元音。
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# --hints--
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你应该匹配到所有25个元音。
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```js
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assert(result.length == 25);
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```
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你的正则表达式`vowelRegex`应该使用字符集。
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```js
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assert(/\[.*\]/.test(vowelRegex.source));
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```
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你的正则表达式`vowelRegex`应该使用全局标志。
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```js
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assert(vowelRegex.flags.match(/g/).length == 1);
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```
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你的正则表达式`vowelRegex`应该使用忽略大小写标志。
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```js
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assert(vowelRegex.flags.match(/i/).length == 1);
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```
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你的正则表达式不应该匹配任何辅音。
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```js
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assert(!/[b-df-hj-np-tv-z]/gi.test(result.join()));
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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 quoteSample = "Beware of bugs in the above code; I have only proved it correct, not tried it.";
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let vowelRegex = /change/; // Change this line
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let result = vowelRegex; // Change this line
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```
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# --solutions--
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```js
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let quoteSample = "Beware of bugs in the above code; I have only proved it correct, not tried it.";
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let vowelRegex = /[aeiou]/gi; // Change this line
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let result = quoteSample.match(vowelRegex); // Change this line
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```
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