bfa5c26288
* Use dfn tags * remove misused <dfn> tags * Revert "remove misused <dfn> tags" This reverts commit b24968a96810f618d831410ac90a0bc452ebde50. * Update curriculum/challenges/english/01-responsive-web-design/basic-html-and-html5/fill-in-the-blank-with-placeholder-text.english.md Co-Authored-By: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * Make "array" lowercase Co-Authored-By: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * Fix dfn usage * Address last dfn tags
75 lines
2.0 KiB
Markdown
75 lines
2.0 KiB
Markdown
---
|
|
id: 587d7db5367417b2b2512b96
|
|
title: Match Letters of the Alphabet
|
|
challengeType: 1
|
|
forumTopicId: 301354
|
|
---
|
|
|
|
## Description
|
|
<section id='description'>
|
|
You saw how you can use <dfn>character sets</dfn> to specify a group of characters to match, but that's a lot of typing when you need to match a large range of characters (for example, every letter in the alphabet). Fortunately, there is a built-in feature that makes this short and simple.
|
|
Inside a character set, you can define a range of characters to match using a hyphen character: <code>-</code>.
|
|
For example, to match lowercase letters <code>a</code> through <code>e</code> you would use <code>[a-e]</code>.
|
|
|
|
```js
|
|
let catStr = "cat";
|
|
let batStr = "bat";
|
|
let matStr = "mat";
|
|
let bgRegex = /[a-e]at/;
|
|
catStr.match(bgRegex); // Returns ["cat"]
|
|
batStr.match(bgRegex); // Returns ["bat"]
|
|
matStr.match(bgRegex); // Returns null
|
|
```
|
|
|
|
</section>
|
|
|
|
## Instructions
|
|
<section id='instructions'>
|
|
Match all the letters in the string <code>quoteSample</code>.
|
|
<strong>Note</strong><br>Be sure to match both upper- and lowercase <strong>letters<strong>.
|
|
</section>
|
|
|
|
## Tests
|
|
<section id='tests'>
|
|
|
|
```yml
|
|
tests:
|
|
- text: Your regex <code>alphabetRegex</code> should match 35 items.
|
|
testString: assert(result.length == 35);
|
|
- text: Your regex <code>alphabetRegex</code> should use the global flag.
|
|
testString: assert(alphabetRegex.flags.match(/g/).length == 1);
|
|
- text: Your regex <code>alphabetRegex</code> should use the case insensitive flag.
|
|
testString: assert(alphabetRegex.flags.match(/i/).length == 1);
|
|
|
|
```
|
|
|
|
</section>
|
|
|
|
## Challenge Seed
|
|
<section id='challengeSeed'>
|
|
|
|
<div id='js-seed'>
|
|
|
|
```js
|
|
let quoteSample = "The quick brown fox jumps over the lazy dog.";
|
|
let alphabetRegex = /change/; // Change this line
|
|
let result = alphabetRegex; // Change this line
|
|
```
|
|
|
|
</div>
|
|
|
|
|
|
|
|
</section>
|
|
|
|
## Solution
|
|
<section id='solution'>
|
|
|
|
```js
|
|
let quoteSample = "The quick brown fox jumps over the lazy dog.";
|
|
let alphabetRegex = /[a-z]/gi; // Change this line
|
|
let result = quoteSample.match(alphabetRegex); // Change this line
|
|
```
|
|
|
|
</section>
|