2018-10-10 22:03:03 +00:00
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id: 587d7db7367417b2b2512b9c
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challengeType: 1
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2020-08-04 07:14:01 +00:00
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forumTopicId: 301343
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2020-10-01 15:54:21 +00:00
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title: 在狩猎中找到一个或多个罪犯
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2018-10-10 22:03:03 +00:00
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---
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## Description
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2020-08-04 07:14:01 +00:00
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<section id='description'>
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是时候暂停和测试你的新正则表达式写作技巧了。一群罪犯逃出监狱逃跑,但你不知道有多少人。但是,你知道他们和其他人在一起时会保持紧密联系。你有责任立刻找到所有的罪犯。
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这里有一个示例来回顾如何做到这一点:
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当字母<code>z</code>在一行中出现一次或连续多次时,正则表达式<code>/z+/</code>会匹配到它。它会在以下所有字符串中找到匹配项:
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```js
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"z"
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"zzzzzz"
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"ABCzzzz"
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"zzzzABC"
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"abczzzzzzzzzzzzzzzzzzzzzabc"
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```
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但是它不会在以下字符串中找到匹配项,因为它们中没有字母<code>z</code>:
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```js
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""
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"ABC"
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"abcabc"
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```
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</section>
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2018-10-10 22:03:03 +00:00
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## Instructions
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2020-08-04 07:14:01 +00:00
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<section id='instructions'>
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编写一个<code>贪婪</code>正则表达式,在一组其他人中匹配到一个或多个罪犯。罪犯由大写字母<code>C</code>表示。
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</section>
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2018-10-10 22:03:03 +00:00
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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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2020-08-04 07:14:01 +00:00
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- text: "你的正则表达式应该匹配<code>'C'</code>中的 <em>一个</em> 罪犯('<code>C</code>')。"
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2020-02-17 16:40:55 +00:00
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testString: assert('C'.match(reCriminals) && 'C'.match(reCriminals)[0] == 'C');
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2020-08-04 07:14:01 +00:00
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- text: "你的正则表达式应该匹配<code>'CC'</code>中的 <em>两个</em> 罪犯('<code>CC</code>')。"
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testString: assert('CC'.match(reCriminals) && 'CC'.match(reCriminals)[0] == 'CC');
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2020-08-04 07:14:01 +00:00
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- text: "你的正则表达式应该匹配<code>'P1P5P4CCCP2P6P3'</code>中的 <em>三个</em> 罪犯('<code>CCC</code>')。"
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2020-02-17 16:40:55 +00:00
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testString: assert('P1P5P4CCCP2P6P3'.match(reCriminals) && 'P1P5P4CCCP2P6P3'.match(reCriminals)[0] == 'CCC');
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2020-08-04 07:14:01 +00:00
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- text: "你的正则表达式应该匹配<code>'P6P2P7P4P5CCCCCP3P1'</code>中的 <em>五个</em> 罪犯('<code>CCCCC</code>')。"
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2020-02-17 16:40:55 +00:00
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testString: assert('P6P2P7P4P5CCCCCP3P1'.match(reCriminals) && 'P6P2P7P4P5CCCCCP3P1'.match(reCriminals)[0] == 'CCCCC');
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2020-08-04 07:14:01 +00:00
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- text: "你的正则表达式在<code>''</code>中不应该匹配到任何罪犯。"
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testString: assert(!reCriminals.test(''));
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- text: "你的正则表达式在<code>'P1P2P3'</code>中不应该匹配到任何罪犯。"
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testString: assert(!reCriminals.test('P1P2P3'));
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- text: "你的正则表达式应该匹配<code>'P2P1P5P4CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCP3'</code>中的 <em>五十个</em> 罪犯('<code>CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC</code>')。"
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testString: assert('P2P1P5P4CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCP3'.match(reCriminals) && 'P2P1P5P4CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCP3'.match(reCriminals)[0] == "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC");
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2018-10-10 22:03:03 +00:00
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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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// example crowd gathering
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let crowd = 'P1P2P3P4P5P6CCCP7P8P9';
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let reCriminals = /./; // Change this line
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let matchedCriminals = crowd.match(reCriminals);
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console.log(matchedCriminals);
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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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2020-08-04 07:14:01 +00:00
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// example crowd gathering
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let crowd = 'P1P2P3P4P5P6CCCP7P8P9';
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let reCriminals = /C+/; // Change this line
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let matchedCriminals = crowd.match(reCriminals);
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2018-10-10 22:03:03 +00:00
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```
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2020-08-04 07:14:01 +00:00
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2018-10-10 22:03:03 +00:00
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</section>
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