how to write regular expression to check valid ip address?

Question

You know 0.0.0.0, 127.0.0.1 is not valid

Answer 1

What do you mean by valid? The two you listed are valid IPs, but they have special uses and so you won't see them on the web. Regular expressions really won't work very well to make sure that each section of the IP falls in between 0 and 255 though. My recommendation is to check that it has the right form, then break out each part and validate that it falls in the range you are looking for.

Answer 2

In what language? 0.0.0.0 is a valid IP address - default network. Please state questions accurately.

Answer 3

to get ip address of ur machine just write:-
ipconfig
in cmd.

Answer 4

In Javascript:

RegExp( \[0-9]{1,3}) \.(\[0-9]{1,3}) \.(\[0-9]{1,3}) \.(\[0-9]{1,3} );

Modify for your language