用于匹配域名和IP地址的正则表达式

Question

对于我的Rails应用程序，我想要一个正则表达式，它将匹配域和IP地址。

Answer 1

You could use something like this:

\\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\b

Taken from here .

EDIT: For domain names, you could use something like so: ^http://(.*?)/?.* . However, it would help if you could post some domain name examples. The regex I have posted should match url which starts with http:// and it will then throw the domain name, such as google.com in a group which you can then access later.

Answer 2

如果您使用的是网址，并尝试匹配主机部分，

/^http:\/\/([^\/])\//

Answer 3

Whenever I need a regex for something, I first go to the Regular Expressions Library . It is there that I found this one that looks quite reasonable:

^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$

I would use a separate regex for IP addresses and ask if the string matches either instead of trying to make both patterns fit a single matcher.

Answer 4

^

I would say you need to be more specific, I also like to use http://www.rubular.com/ to develop my regexs. It has a reference key under the editor so you can play with it. You can have fun and get your work done at the same time!