58 lines
2.0 KiB
Markdown
58 lines
2.0 KiB
Markdown
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---
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id: 587d7dba367417b2b2512ba8
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title: Check for All or None
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challengeType: 1
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videoUrl: ''
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localeTitle: 检查全部或无
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---
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## Description
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<section id="description">有时，您要搜索的模式可能包含可能存在或可能不存在的模式。但是，尽管如此，检查它们可能很重要。您可以指定可能存在带问号的元素， <code>?</code> 。这将检查前一个元素中的零个或一个。您可以将此符号视为前一个元素是可选的。例如，美式英语和英式英语略有不同，您可以使用问号来匹配两种拼写。 <blockquote>让美国人=“颜色”; <br>让british =“color”; <br>让rainbowRegex = / colou？r /; <br> rainbowRegex.test（美国）; //返回true <br> rainbowRegex.test（英国）; //返回true </blockquote></section>
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## Instructions
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<section id="instructions">更改正则表达式<code>favRegex</code>以匹配该单词的美国英语（收藏）和英国英语（收藏）版本。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 你的正则表达式应该使用可选的符号， <code>?</code> 。
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testString: 'assert(favRegex.source.match(/\?/).length > 0, "Your regex should use the optional symbol, <code>?</code>.");'
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- text: 你的正则表达式应该匹配<code>"favorite"</code>
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testString: 'assert(favRegex.test("favorite"), "Your regex should match <code>"favorite"</code>");'
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- text: 你的正则表达式应该匹配<code>"favourite"</code>
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testString: 'assert(favRegex.test("favourite"), "Your regex should match <code>"favourite"</code>");'
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- text: 你的正则表达式不应该匹配<code>"fav"</code>
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testString: 'assert(!favRegex.test("fav"), "Your regex should not match <code>"fav"</code>");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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let favWord = "favorite";
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let favRegex = /change/; // Change this line
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let result = favRegex.test(favWord);
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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