62 lines
2.5 KiB
Markdown
62 lines
2.5 KiB
Markdown
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---
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id: 587d7db9367417b2b2512ba7
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title: Specify Exact Number of Matches
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challengeType: 1
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videoUrl: ''
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localeTitle: 指定完全匹配数
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---
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## Description
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<section id="description">您可以使用大括号<code>quantity specifiers</code>的较低和较高数量的模式。有时您只需要特定数量的匹配。要指定一定数量的模式，只需在大括号之间放置一个数字。例如，要仅将单词<code>"hah"</code>与字母<code>a</code>匹配<code>3</code>次，您的正则表达式将为<code>/ha{3}h/</code> 。 <blockquote>让A4 =“haaaah”; <br>让A3 =“haaah”; <br>设A100 =“h”+“a”.repeat（100）+“h”; <br> let multipleHA = / ha {3} h /; <br> multipleHA.test（A4）; //返回false <br> multipleHA.test（A3）; //返回true <br> multipleHA.test（A100）; //返回false </blockquote></section>
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## Instructions
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<section id="instructions">只有当它有四个字母<code>m</code>时才更改正则表达式<code>timRegex</code>以匹配单词<code>"Timber"</code> 。 </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大括号。
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testString: 'assert(timRegex.source.match(/{.*?}/).length > 0, "Your regex should use curly brackets.");'
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- text: 你的正则表达式不应该与<code>"Timber"</code>匹配
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testString: 'assert(!timRegex.test("Timber"), "Your regex should not match <code>"Timber"</code>");'
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- text: 你的正则表达式不应该匹配<code>"Timmber"</code>
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testString: 'assert(!timRegex.test("Timmber"), "Your regex should not match <code>"Timmber"</code>");'
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- text: 你的正则表达式不应该匹配<code>"Timmmber"</code>
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testString: 'assert(!timRegex.test("Timmmber"), "Your regex should not match <code>"Timmmber"</code>");'
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- text: 你的正则表达式应该匹配<code>"Timmmmber"</code>
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testString: 'assert(timRegex.test("Timmmmber"), "Your regex should match <code>"Timmmmber"</code>");'
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- text: 你的正则表达式不应该与30 <code>m</code>的<code>"Timber"</code>相匹配。
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testString: 'assert(!timRegex.test("Ti" + "m".repeat(30) + "ber"), "Your regex should not match <code>"Timber"</code> with 30 <code>m</code>\"s in it.");'
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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 timStr = "Timmmmber";
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let timRegex = /change/; // Change this line
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let result = timRegex.test(timStr);
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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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