15 lines
556 B
JavaScript
15 lines
556 B
JavaScript
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'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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export default 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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