---
title: isAbsoluteURL
tags: string,browser,regexp,intermediate
---

Checks if the given string is an absolute URL.

- Use `RegExp.prototype.test()` to test if the string is an absolute URL.

```js
const isAbsoluteURL = str => /^[a-z][a-z0-9+.-]*:/.test(str);
```

```js
isAbsoluteURL('https://google.com'); // true
isAbsoluteURL('ftp://www.myserver.net'); // true
isAbsoluteURL('/foo/bar'); // false
```