在Rails中使用正则表达式验证域名和IP地址

Question

I have tried build app like whois domain tool site.

On form have one text_field and I want field only input with domain name and ip address.

Example domain name : domain.com (without http://www. or https://www. or subdomain. )

Example Ip address : 4.4.4.4

I want validate using regex, I have create this regex ( demo on rubular )

([a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+.*)

But that is not clean, www. or subdomain still accepted.

Answer 1

IP地址：

/^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}(?:\-([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]))?$/

Answer 2

请检查此内置的Ruby类Resolv :: IPv4 :: Regex中的IP验证以及此URI中的域名。