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Validate a URL in JavaScript using a regular expression

Solution
// Copyright (c) 2010-2013 Diego Perini (http://www.iport.it) - MIT license
var urlValidator = new RegExp(/^(?:(?:https?|ftp):\/\/)(?:\S+(?::\S*)[email protected])?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,}))\.?)(?::\d{2,5})?(?:[/?#]\S*)?$/i);

var isUrl = urlValidator.test('http://...');
Example
var result = urlValidator.test('http://example.org');
// result = true
var result = urlValidator.test('@example.org');
// result = false

See the original gist for the explanation of the regular expression and the URL standard for more details about URLs.

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