86 lines
1.8 KiB
Markdown
86 lines
1.8 KiB
Markdown
---
|
|
id: 5d712346c441eddfaeb5bdef
|
|
title: Match All Numbers
|
|
challengeType: 1
|
|
forumTopicId: 18181
|
|
dashedName: match-all-numbers
|
|
---
|
|
|
|
# --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 `\d`, with a lowercase `d`. This is equal to the character class `[0-9]`, which looks for a single character of any number between zero and nine.
|
|
|
|
# --instructions--
|
|
|
|
Use the shorthand character class `\d` to count how many digits are in movie titles. Written out numbers ("six" instead of 6) do not count.
|
|
|
|
# --hints--
|
|
|
|
Your regex should use the shortcut character to match digit characters
|
|
|
|
```js
|
|
assert(/\\d/.test(numRegex.source));
|
|
```
|
|
|
|
Your regex should use the global flag.
|
|
|
|
```js
|
|
assert(numRegex.global);
|
|
```
|
|
|
|
Your regex should find 1 digit in `"9"`.
|
|
|
|
```js
|
|
assert('9'.match(numRegex).length == 1);
|
|
```
|
|
|
|
Your regex should find 2 digits in `"Catch 22"`.
|
|
|
|
```js
|
|
assert('Catch 22'.match(numRegex).length == 2);
|
|
```
|
|
|
|
Your regex should find 3 digits in `"101 Dalmatians"`.
|
|
|
|
```js
|
|
assert('101 Dalmatians'.match(numRegex).length == 3);
|
|
```
|
|
|
|
Your regex should find no digits in `"One, Two, Three"`.
|
|
|
|
```js
|
|
assert('One, Two, Three'.match(numRegex) == null);
|
|
```
|
|
|
|
Your regex should find 2 digits in `"21 Jump Street"`.
|
|
|
|
```js
|
|
assert('21 Jump Street'.match(numRegex).length == 2);
|
|
```
|
|
|
|
Your regex should find 4 digits in `"2001: A Space Odyssey"`.
|
|
|
|
```js
|
|
assert('2001: A Space Odyssey'.match(numRegex).length == 4);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
let movieName = "2001: A Space Odyssey";
|
|
let numRegex = /change/; // Change this line
|
|
let result = movieName.match(numRegex).length;
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
let movieName = "2001: A Space Odyssey";
|
|
let numRegex = /\d/g; // Change this line
|
|
let result = movieName.match(numRegex).length;
|
|
```
|