20 lines
486 B
Markdown
20 lines
486 B
Markdown
---
|
|
title: isAlphaNumeric
|
|
tags: string,regexp,intermediate
|
|
---
|
|
|
|
Checks if a string contains only alphanumeric characters.
|
|
|
|
Use `String.prototype.match()` to check if input string matches against alphanumeric regex pattern.
|
|
|
|
```js
|
|
const isAlphaNumeric = (str) => !!str.match(/^[a-z0-9]+$/gi);
|
|
```
|
|
|
|
```js
|
|
isAlphaNumeric('hello123'); // true
|
|
isAlphaNumeric('123'); // true
|
|
isAlphaNumeric('hello 123'); // false (space character is not alphanumeric)
|
|
isAlphaNumeric('#$hello'); // false
|
|
```
|