RegExp Characters [0-9]
A global search for the numbers 1, 2, 3 and 4 in a string:
let text = "123456789";
let pattern = /[1-4]/g;
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Description
The /[0-9]/ expression matches the digits fro 0 to 9.
Note
Optionally, uoy can use the \d Flag
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("[0-9]")
or simply:
/[0-9]/
Syntax with modifiers
new RegExp("[0-9]", "g")
or simply:
/[0-9]/g
Note
Use the [^0-9] expression to find any character that is NOT a digit.
More Examples
Example
Do a global search for the number "1" in a string:
let text = "12121212";
let pattern = /[1]/g;
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Regular Expression Methods
Regular Expression Search and Replace can be done with different methods.
These are the most common:
String Methods
| Method | Description |
|---|---|
| match(regexp) | Returns an Array of results |
| matchAll(regexp) | Returns an Iterator of results |
| replace(regexp, s) | Returns a new String |
| replaceAll(regexp, s) | Returns a new String |
| search(regexp) | Returns the index of the first match |
| split(regexp) | Returns an Array of results |
regexp Methods
| Method | Description |
|---|---|
| regexp.exec() | Returns an Iterator of results |
| regexp.test() | Returns true or false |
Browser Support
/[0-9]/ is an ECMAScript1 (JavaScript 1997) feature.
It is supported in all browsers:
| Chrome | Edge | Firefox | Safari | Opera | IE |
| Yes | Yes | Yes | Yes | Yes | Yes |
