74 lines
2.1 KiB
Markdown
74 lines
2.1 KiB
Markdown
---
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id: 587d7db8367417b2b2512ba3
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challengeType: 1
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forumTopicId: 301359
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title: 匹配空白字符
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---
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## Description
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<section id='description'>
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迄今为止的挑战包括匹配的字母和数字。还可以匹配字母之间的空格。
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可以使用<code>\s</code>搜寻空格，其中<code>s</code>是小写。此匹配模式不仅匹配空格，还匹配回车符、制表符、换页符和换行符，可以将其视为与<code>[\r\t\f\n\v]</code>类似。
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```js
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let whiteSpace = "Whitespace. Whitespace everywhere!"
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let spaceRegex = /\s/g;
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whiteSpace.match(spaceRegex);
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// Returns [" ", " "]
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```
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</section>
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## Instructions
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<section id='instructions'>
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修改正则表达式<code>countWhiteSpace</code>查找字符串中的多个空白字符。
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</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全局状态修正符。
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testString: assert(countWhiteSpace.global);
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- text: 正则表达式应该使用元字符 <code>\s</code> 匹配所有的空白。
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testString: assert(/\\s/.test(countWhiteSpace.source));
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- text: "你的正则表达式应该在<code>'Men are from Mars and women are from Venus.'</code>中匹配到 8 个空白字符。"
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testString: assert("Men are from Mars and women are from Venus.".match(countWhiteSpace).length == 8);
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- text: '你的正则表达式应该在<code>"Space: the final frontier."</code>中匹配到 3 个空白字符。'
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testString: 'assert("Space: the final frontier.".match(countWhiteSpace).length == 3);'
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- text: "你的正则表达式在<code>'MindYourPersonalSpace'</code>中应该匹配不到空白字符。"
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testString: assert("MindYourPersonalSpace".match(countWhiteSpace) == null);
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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 sample = "Whitespace is important in separating words";
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let countWhiteSpace = /change/; // Change this line
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let result = sample.match(countWhiteSpace);
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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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let sample = "Whitespace is important in separating words";
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let countWhiteSpace = /\s/g;
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let result = sample.match(countWhiteSpace);
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```
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</section>
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