22 lines
563 B
Markdown
22 lines
563 B
Markdown
---
|
|
title: isAlphaNumeric
|
|
tags: string,regexp,beginner
|
|
firstSeen: 2020-09-06T07:59:16+03:00
|
|
lastUpdated: 2020-10-20T23:02:01+03:00
|
|
---
|
|
|
|
Checks if a string contains only alphanumeric characters.
|
|
|
|
- Use `RegExp.prototype.test()` to check if the input string matches against the alphanumeric regexp pattern.
|
|
|
|
```js
|
|
const isAlphaNumeric = str => /^[a-z0-9]+$/gi.test(str);
|
|
```
|
|
|
|
```js
|
|
isAlphaNumeric('hello123'); // true
|
|
isAlphaNumeric('123'); // true
|
|
isAlphaNumeric('hello 123'); // false (space character is not alphanumeric)
|
|
isAlphaNumeric('#$hello'); // false
|
|
```
|