65 lines
3.0 KiB
Markdown
65 lines
3.0 KiB
Markdown
---
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id: 587d7db5367417b2b2512b95
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title: Match Single Character with Multiple Possibilities
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challengeType: 1
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---
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## Description
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<section id='description'>
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You learned how to match literal patterns (<code>/literal/</code>) and wildcard character (<code>/./</code>). Those are the extremes of regular expressions, where one finds exact matches and the other matches everything. There are options that are a balance between the two extremes.
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You can search for a literal pattern with some flexibility with <code>character classes</code>. Character classes allow you to define a group of characters you wish to match by placing them inside square (<code>[</code> and <code>]</code>) brackets.
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For example, you want to match <code>"bag"</code>, <code>"big"</code>, and <code>"bug"</code> but not <code>"bog"</code>. You can create the regex <code>/b[aiu]g/</code> to do this. The <code>[aiu]</code> is the character class that will only match the characters <code>"a"</code>, <code>"i"</code>, or <code>"u"</code>.
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<blockquote>let bigStr = "big";<br>let bagStr = "bag";<br>let bugStr = "bug";<br>let bogStr = "bog";<br>let bgRegex = /b[aiu]g/;<br>bigStr.match(bgRegex); // Returns ["big"]<br>bagStr.match(bgRegex); // Returns ["bag"]<br>bugStr.match(bgRegex); // Returns ["bug"]<br>bogStr.match(bgRegex); // Returns null</blockquote>
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</section>
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## Instructions
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<section id='instructions'>
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Use a character class with vowels (<code>a</code>, <code>e</code>, <code>i</code>, <code>o</code>, <code>u</code>) in your regex <code>vowelRegex</code> to find all the vowels in the string <code>quoteSample</code>.
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<strong>Note</strong><br>Be sure to match both upper- and lowercase vowels.
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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: You should find all 25 vowels.
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testString: assert(result.length == 25, 'You should find all 25 vowels.');
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- text: Your regex <code>vowelRegex</code> should use a character class.
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testString: assert(/\[.*\]/.test(vowelRegex.source), 'Your regex <code>vowelRegex</code> should use a character class.');
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- text: Your regex <code>vowelRegex</code> should use the global flag.
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testString: assert(vowelRegex.flags.match(/g/).length == 1, 'Your regex <code>vowelRegex</code> should use the global flag.');
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- text: Your regex <code>vowelRegex</code> should use the case insensitive flag.
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testString: assert(vowelRegex.flags.match(/i/).length == 1, 'Your regex <code>vowelRegex</code> should use the case insensitive flag.');
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- text: Your regex should not match any consonants.
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testString: assert(!/[b-df-hj-np-tv-z]/gi.test(result.join()), 'Your regex should not match any consonants.');
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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 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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</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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