Regex to validate domain name

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Using a regular expression to check if it is a valid domain. function isValidDomain(v) { if ( ! v) return false ; var re = /^(?!:\/\/)([a-zA-Z0-9-]+\.){0,5}[a-zA-Z0-9-][a-zA-Z0-9-]+\.[a-zA-Z]{2,64}?$/gi ; return re.test(v); } Usage isValidDomain( 'example.com' ) // true isValidDomain( 'foo.example.com' ) // true isValidDomain( 'bar.foo.example.com' ) // true isValidDomain( 'exa-mple.co.uk' ) //…

function isValidDomain(v) {
 if (!v) return false;
 var re = /^(?!:\/\/)([a-zA-Z0-9-]+\.){0,5}[a-zA-Z0-9-][a-zA-Z0-9-]+\.[a-zA-Z]{2,64}?$/gi;
 return re.test(v);
}

isValidDomain('example.com') // true
isValidDomain('foo.example.com') // true
isValidDomain('bar.foo.example.com') // true
isValidDomain('exa-mple.co.uk') // true
isValidDomain('exa_mple.com') // false
isValidDomain('example') // false
isValidDomain('ex*mple.com') // false
isValidDomain(3434) // false

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