C code for validating ip address

IPv4 addresses are canonically represented in dot-decimal notation, which consists of four decimal numbers, each ranging from 0 to 255, separated by dots ("."), e.g., is also a valid IPv6 address(Omit leading zeros and using upper cases).However, we don't replace a consecutive group of zero value with a single empty group using two consecutive colons (::) to pursue simplicity.The problems presented in this chapter aren’t the kind of real-world problems that your boss or your customers ask you to solve.

# It currently doesn't work due to a problem figuring out how to impose # the range values of the regular expression onto the values being entered # by the user, so that one can only enter valid IP addresses.# Purpose: a part of a series of examples of Tk code validating # the input of a user.# # This example takes as an argument a possible IP address.But when creating a regular expression, you’ll likely need it to match certain text literally, and you’ll need to know which characters to escape. The recipes start out with very basic regular expression techniques.If you’ve used regular expressions before, you can probably skim or even skip them. We devised the recipes in this chapter in such a way that each explains one aspect of the regular expression syntax.

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The recipes further down in this chapter will surely teach you something new, unless you have already read by Jeffrey E. Together, they form a comprehensive tutorial to regular expressions.

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