23 lines
545 B
Markdown
23 lines
545 B
Markdown
---
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title: Check if absolute URL
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tags: string,browser,regexp
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expertise: intermediate
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cover: blog_images/coffee-phone-tray-2.jpg
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firstSeen: 2017-12-31T14:42:45+02:00
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lastUpdated: 2020-10-20T23:02:01+03:00
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---
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Checks if the given string is an absolute URL.
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- Use `RegExp.prototype.test()` to test if the string is an absolute URL.
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```js
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const isAbsoluteURL = str => /^[a-z][a-z0-9+.-]*:/.test(str);
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```
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```js
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isAbsoluteURL('https://google.com'); // true
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isAbsoluteURL('ftp://www.myserver.net'); // true
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isAbsoluteURL('/foo/bar'); // false
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```
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