Office Whisperer

const VALID_HOST_LABEL_REGEX = new RegExp(`^(?!.*-$)(?!-)[a-zA-Z0-9-]{1,63}$`); export const isValidHostLabel = (value, allowSubDomains = false) => { if (!allowSubDomains) { return VALID_HOST_LABEL_REGEX.test(value); } const labels = value.split("."); for (const label of labels) { if (!isValidHostLabel(label)) { return false; } } return true; };