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14 lines
563 B
14 lines
563 B
'use strict'; |
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/** |
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* Determines whether the specified URL is absolute |
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* |
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* @param {string} url The URL to test |
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* @returns {boolean} True if the specified URL is absolute, otherwise false |
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*/ |
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module.exports = function isAbsoluteURL(url) { |
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// A URL is considered absolute if it begins with "<scheme>://" or "//" (protocol-relative URL). |
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// RFC 3986 defines scheme name as a sequence of characters beginning with a letter and followed |
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// by any combination of letters, digits, plus, period, or hyphen. |
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return /^([a-z][a-z\d\+\-\.]*:)?\/\//i.test(url); |
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};
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