79d9012432
* fix(curriculum): tests quotes * fix(curriculum): fill seed-teardown * fix(curriculum): fix tests and remove unneeded seed-teardown
65 lines
3.0 KiB
Markdown
65 lines
3.0 KiB
Markdown
---
|
|
id: 587d7db5367417b2b2512b95
|
|
title: Match Single Character with Multiple Possibilities
|
|
challengeType: 1
|
|
---
|
|
|
|
## Description
|
|
<section id='description'>
|
|
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.
|
|
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.
|
|
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>.
|
|
<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>
|
|
</section>
|
|
|
|
## Instructions
|
|
<section id='instructions'>
|
|
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>.
|
|
<strong>Note</strong><br>Be sure to match both upper- and lowercase vowels.
|
|
</section>
|
|
|
|
## Tests
|
|
<section id='tests'>
|
|
|
|
```yml
|
|
tests:
|
|
- text: You should find all 25 vowels.
|
|
testString: assert(result.length == 25, 'You should find all 25 vowels.');
|
|
- text: Your regex <code>vowelRegex</code> should use a character class.
|
|
testString: assert(/\[.*\]/.test(vowelRegex.source), 'Your regex <code>vowelRegex</code> should use a character class.');
|
|
- text: Your regex <code>vowelRegex</code> should use the global flag.
|
|
testString: assert(vowelRegex.flags.match(/g/).length == 1, 'Your regex <code>vowelRegex</code> should use the global flag.');
|
|
- text: Your regex <code>vowelRegex</code> should use the case insensitive flag.
|
|
testString: assert(vowelRegex.flags.match(/i/).length == 1, 'Your regex <code>vowelRegex</code> should use the case insensitive flag.');
|
|
- text: Your regex should not match any consonants.
|
|
testString: assert(!/[b-df-hj-np-tv-z]/gi.test(result.join()), 'Your regex should not match any consonants.');
|
|
|
|
```
|
|
|
|
</section>
|
|
|
|
## Challenge Seed
|
|
<section id='challengeSeed'>
|
|
|
|
<div id='js-seed'>
|
|
|
|
```js
|
|
let quoteSample = "Beware of bugs in the above code; I have only proved it correct, not tried it.";
|
|
let vowelRegex = /change/; // Change this line
|
|
let result = vowelRegex; // Change this line
|
|
```
|
|
|
|
</div>
|
|
|
|
|
|
|
|
</section>
|
|
|
|
## Solution
|
|
<section id='solution'>
|
|
|
|
```js
|
|
// solution required
|
|
```
|
|
</section>
|