33 lines
561 B
JavaScript
33 lines
561 B
JavaScript
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/**
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* Module exports.
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*/
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module.exports = dnsDomainLevels;
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/**
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* Returns the number (integer) of DNS domain levels (number of dots) in the
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* hostname.
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*
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* Examples:
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*
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* ``` js
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* dnsDomainLevels("www")
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* // returns 0.
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* dnsDomainLevels("www.netscape.com")
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* // returns 2.
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* ```
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*
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* @param {String} host is the hostname from the URL.
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* @return {Number} number of domain levels
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*/
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function dnsDomainLevels (host) {
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var match = String(host).match(/\./g);
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var levels = 0;
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if (match) {
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levels = match.length;
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}
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return levels;
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}
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