15 lines
349 B
TypeScript
15 lines
349 B
TypeScript
/**
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* Check if a sub-domain is valid
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* @param {String} hostname sub-domain
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* @returns {Boolean} true if valid
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*/
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const isValidHost = (hostname?: string) => {
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if (typeof hostname !== 'string') {
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return false;
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}
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const regex = /^[\dA-Z](?:[\dA-Z-]{0,61}[\dA-Z])?$/i;
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return regex.test(hostname);
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};
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export { isValidHost };
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