[RESOLVED] Input Validation for an IP address

Hello all,

I'm trying to validate the input for an IP address. I'm getting a little bit tied up on the logic of it...

The only thing I can really come up with is this:
-Take the IP address in as a char[]
-Parse to check for the correct format and number of decimal points
-Split it into four ints representing each octet
-check that the ints are within the valid range

I feel like there is a much better way to go about this...If anybody has done this before any help would be appreciated!


Of course, I could always compile a list of all IP addresses and compare an input string to each one...I flirted with this idea enough to make a quick program to output all IP addresses sequentially into a TXT file. I left it running for about 2 hours and had still only written less than 2% of all IP addresses!! :p

Quote:

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Originally Posted by Austin.Soucy

Hello all,

I'm trying to validate the input for an IP address. I'm getting a little bit tied up on the logic of it...

The only thing I can really come up with is this:
-Take the IP address in as a char[]
-Parse to check for the correct format and number of decimal points
-Split it into four ints representing each octet
-check that the ints are within the valid range

I feel like there is a much better way to go about this...If anybody has done this before any help would be appreciated!

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If you're using C++, and your compiler has regular expression support (#include <regex>), then use that.

An IP address validation can be done using a regular expression -- just google it and you will see what it is.

http://www.google.com/#sclient=psy&h...b08d9a0d602c0a

Regards,

Paul McKenzie

This is exactly what I needed thank you!

Interestingly enough, this thread shows up on your google search already. Last one on the first page! :p