73 lines
2.2 KiB
Markdown
73 lines
2.2 KiB
Markdown
---
|
|
id: 5d712346c441eddfaeb5bdef
|
|
title: Match All Numbers
|
|
challengeType: 1
|
|
forumTopicId: 18181
|
|
---
|
|
|
|
## Description
|
|
<section id='description'>
|
|
You've learned shortcuts for common string patterns like alphanumerics. Another common pattern is looking for just digits or numbers.
|
|
The shortcut to look for digit characters is <code>\d</code>, with a lowercase <code>d</code>. This is equal to the character class <code>[0-9]</code>, which looks for a single character of any number between zero and nine.
|
|
</section>
|
|
|
|
## Instructions
|
|
<section id='instructions'>
|
|
Use the shorthand character class <code>\d</code> to count how many digits are in movie titles. Written out numbers ("six" instead of 6) do not count.
|
|
</section>
|
|
|
|
## Tests
|
|
<section id='tests'>
|
|
|
|
```yml
|
|
tests:
|
|
- text: Your regex should use the shortcut character to match digit characters
|
|
testString: assert(/\\d/.test(numRegex.source));
|
|
- text: Your regex should use the global flag.
|
|
testString: assert(numRegex.global);
|
|
- text: Your regex should find 1 digit in <code>"9"</code>.
|
|
testString: assert("9".match(numRegex).length == 1);
|
|
- text: Your regex should find 2 digits in <code>"Catch 22"</code>.
|
|
testString: assert("Catch 22".match(numRegex).length == 2);
|
|
- text: Your regex should find 3 digits in <code>"101 Dalmatians"</code>.
|
|
testString: assert("101 Dalmatians".match(numRegex).length == 3);
|
|
- text: Your regex should find no digits in <code>"One, Two, Three"</code>.
|
|
testString: assert("One, Two, Three".match(numRegex) == null);
|
|
- text: Your regex should find 2 digits in <code>"21 Jump Street"</code>.
|
|
testString: assert("21 Jump Street".match(numRegex).length == 2);
|
|
- text: 'Your regex should find 4 digits in <code>"2001: A Space Odyssey"</code>.'
|
|
testString: 'assert("2001: A Space Odyssey".match(numRegex).length == 4);'
|
|
|
|
```
|
|
|
|
</section>
|
|
|
|
## Challenge Seed
|
|
<section id='challengeSeed'>
|
|
|
|
<div id='js-seed'>
|
|
|
|
```js
|
|
let movieName = "2001: A Space Odyssey";
|
|
let numRegex = /change/; // Change this line
|
|
let result = movieName.match(numRegex).length;
|
|
```
|
|
|
|
</div>
|
|
|
|
|
|
|
|
</section>
|
|
|
|
## Solution
|
|
<section id='solution'>
|
|
|
|
```js
|
|
let movieName = "2001: A Space Odyssey";
|
|
let numRegex = /\d/g; // Change this line
|
|
let result = movieName.match(numRegex).length;
|
|
|
|
```
|
|
|
|
</section>
|