如何使用正则表达式验证此IP地址

Question

i want to make regular expression to validate these type of ip addresses.like

       192.168.12.1       # it may be any proper ip address 

       193.168.34.3-3     # this format should also be acceptable

Because i want to take value from user in range.

Thanks in advance

Answer 1

^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.
([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])$

is the regex for validating ip addresses in 0-255.0-255.0-255.0-255 format. What is the range for the last number, the one separated with -

EDIT

^([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?)(?:\-([01]?\d\d?|2[0-4]\d|25[0-5]))?|2[0-4]\d|25[0-5](?:\-([01]?\d\d?|2[0-4]\d|25[0-5]))?$ 

This should work for OP's scenario.

Answer 2

The Rails way to validate with ActiveRecord in Rails 3 is:

@ip_regex = /^([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}$/

validates :gateway, 
          :presence => true, 
          :uniqueness => true,
          :format => { :with => @ip_regex } 

Answer 3

([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}[\\-0-9]*)将验证您的两个示例。.如果您需要更具体的示例，是否可以更具体？

Answer 4

呼叫([0-9] | [1-9][0-9] | 1[0-9][0-9] | 2[0-4][0-9] | 25[0-5])为简单起见，“正则表达式”为“模式”；

Pattern\.Pattern\.Pattern\.Pattern(-Pattern)?

Answer 5

You can start here

http://answers.oreilly.com/topic/318-how-to-match-ipv4-addresses-with-regular-expressions/

and modify as you want.

Answer 6

签出此正则表达式。

/^([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]))?$/