---
id: 587d7db5367417b2b2512b96
title: Match Letters of the Alphabet
challengeType: 1
forumTopicId: 301354
---
## Description
You saw how you can use character sets 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: -.
For example, to match lowercase letters a through e you would use [a-e].
```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
```
## Instructions
Match all the letters in the string quoteSample.
Note
Be sure to match both upper- and lowercase letters.
## Tests
```yml
tests:
- text: Your regex alphabetRegex should match 35 items.
testString: assert(result.length == 35);
- text: Your regex alphabetRegex should use the global flag.
testString: assert(alphabetRegex.flags.match(/g/).length == 1);
- text: Your regex alphabetRegex should use the case insensitive flag.
testString: assert(alphabetRegex.flags.match(/i/).length == 1);
```
## Challenge 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
```
## 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
```