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javascript/snippets/is-absolute-url.md

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+---
+title: Check if absolute URL
+type: snippet
+tags: [string,browser,regexp]
+cover: coffee-phone-tray-2
+dateModified: 2020-10-20T23:02:01+03:00
+---
+
+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
+```