---
id: 587d7db5367417b2b2512b95
title: Match Single Character with Multiple Possibilities
challengeType: 1
---
## Description
You learned how to match literal patterns (/literal/) and wildcard character (/./). 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 character classes. Character classes allow you to define a group of characters you wish to match by placing them inside square ([ and ]) brackets.
For example, you want to match "bag", "big", and "bug" but not "bog". You can create the regex /b[aiu]g/ to do this. The [aiu] is the character class that will only match the characters "a", "i", or "u".
let bigStr = "big";
let bagStr = "bag";
let bugStr = "bug";
let bogStr = "bog";
let bgRegex = /b[aiu]g/;
bigStr.match(bgRegex); // Returns ["big"]
bagStr.match(bgRegex); // Returns ["bag"]
bugStr.match(bgRegex); // Returns ["bug"]
bogStr.match(bgRegex); // Returns null
## Instructions
Use a character class with vowels (a, e, i, o, u) in your regex vowelRegex to find all the vowels in the string quoteSample.
Note
Be sure to match both upper- and lowercase vowels.
## Tests
```yml
tests:
- text: You should find all 25 vowels.
testString: assert(result.length == 25, 'You should find all 25 vowels.');
- text: Your regex vowelRegex should use a character class.
testString: assert(/\[.*\]/.test(vowelRegex.source), 'Your regex vowelRegex should use a character class.');
- text: Your regex vowelRegex should use the global flag.
testString: assert(vowelRegex.flags.match(/g/).length == 1, 'Your regex vowelRegex should use the global flag.');
- text: Your regex vowelRegex should use the case insensitive flag.
testString: assert(vowelRegex.flags.match(/i/).length == 1, 'Your regex vowelRegex 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.');
```
## Challenge 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
```
## Solution
```js
// solution required
```