RegExp Characters [A-Z]
A global search for characters in the range from A to Z:
let text = "This is W3School";
let pattern = /[A-Z]/g;
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Description
The /[A-Z]/ expression matches character in the range from A to Z.
Tip
The /[^A-Z]/ expression matches characters NOT between A and Z.
RegExp Brackets
Brackets [] specifies matches for the characters inside the brackets.
Brackets can define single characters, groups, or character spans:
| [a] | Matches the character a |
| [abc] | Matches the characters a, b, or c |
| [A-Z] | Matches all characters from uppercase A to uppercase Z |
| [a-z] | Matches all characters from lowercase a to lowercase z |
| [0-9] | Matches all digits from 0 to 9 |
Syntax
new RegExp("[A-Z]")
or simply:
/[A-Z]/
Syntax with modifiers
new RegExp("[A-Z]", "g")
or simply:
/[A-Z]/g
Regular Expression Methods
Regular Expression Search and Replace can be done with different methods.
These are the most common:
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 |
Browser Support
/[A-Z]/ is an ECMAScript1 (JavaScript 1997) feature.
It is supported in all browsers:
| Chrome | Edge | Firefox | Safari | Opera | IE |
| Yes | Yes | Yes | Yes | Yes | Yes |
