Regex to match Ipv4 with mask

问题

I am validating a Ipv4 address by a regex and it does not support subnet mask.

^([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])$

Can some one help me with the regex which supports mask as well.

Here is a working example of this regex: demo

回答1:

Add (?:/[0-2]\d|/3[0-2])? at the end of your regex. You can also simplify the regex:

^([01]?\d\d?|2[0-4]\d|25[0-5])(?:\.(?:[01]?\d\d?|2[0-4]\d|25[0-5])){3}(?:/[0-2]\d|/3[0-2])?$

回答2:

In your example, if you want it to match both adresses, remove beginning ^ and trailing $

来源：https://stackoverflow.com/questions/30590193/regex-to-match-ipv4-with-mask