Character Classes are characters enclosed in square brackets [] .
A character class matches any character from a set within brackets:
// Match Digits
const pattern = /[0-9]/;JavaScript Regex Character Classes
| Class | Description |
|---|---|
| [a] | Matches the character between the brackets |
| [^a] | Matches all characters NOT between the brackets |
| [abc] | Matches all characters between the brackets |
| [^abc] | Matches all characters NOT between the brackets |
| [a-z] | Matches all characters in the range from a to z |
| [^a-z] | Matches all characters NOT in the range from a to z |
| [0-9] | Matches all characters in the range from 0 to 9 |
Example [HW]
let text = "Hello World!";
const pattern = /[HW]/g;
let result = text.match(pattern);Example [A-Z]
let text = "This is W3School";
const pattern = /[A-Z]/g;
let result = text.match(pattern);Example [1234]
let text = "123456789";
const pattern = /[1234]/g;
let result = text.match(pattern);Example [1-4]
let text = "123456789";
const pattern = /[1-4]/g;
let result = text.match(pattern);[01234] is the same as [0-4]
[abcde] is the same as [a-e]
Regular Expression Methods
Regular Expression Search and Replace can be done with different methods.
String Methods
| Method | Description |
|---|---|
| match( regex ) | Returns an Array of results |
| matchAll( regex ) | Returns an Iterator of results |
| replace( regex ) | Returns a new String |
| replaceAll( regex ) | Returns a new String |
| search( regex ) | Returns the index of the first match |
| split( regex ) | Returns an Array of results |
RegExp Methods
| Method | Description |
|---|---|
| regex .exec() | Returns an Iterator of results |
| regex .test() | Returns true or false |
See Also
JavaScript RegExp Flags
JavaScript RegExp Meta Characters
JavaScript RegExp Assertions
JavaScript RegExp Quantifiers
JavaScript RegExp Patterns
JavaScript RegExp Objects
JavaScript RegExp Methods