19 lines
422 B
Markdown
19 lines
422 B
Markdown
---
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title: isAbsoluteURL
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tags: string,browser,intermediate
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---
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Returns `true` if the given string is an absolute URL, `false` otherwise.
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- Use a regular expression 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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