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this is the correct regexp for validating Ipv4 addressing: ( $ipaddr =~ m/^(\d\d? I did notice that fact and corrected it in my local scripts where I used it, but never updated it here. @dhineshkumar I would still chomp $ARGV as a "just in case", but that's me. @j0sh097 Just wanted to note that the version I used in the code actually catches the 1.1.1.1e and doesn't let it pass. )/ ) but for example IP provided is 1.12.123.1234, with above expression it is a valid IP address. I preferred to re-invent the wheel, that's why I wrote this. I never actually came back to this and corrected it. Java Script validation is nice and quick because there's no round-trip to the server; however Perl validation is more secure and reliable, because it will always work even if the browser has Java Script disabled, or if the user has managed to "hack" the Java Script validation.If you've followed our Writing a simple form mailer tutorial, you'll know how to write a simple Perl form handler that uses a static HTML page to display the form.The most reliable way to make sure your users haven't filled in your forms wrongly is to use server-side form validation.

You'll have to add a '$' to the end of each regex ...

Once you have an HTML form up and running, you will often want to make sure that all the important fields are filled in.

For example, if you are going to send an email confirmation letter, the email address should be included in the form fields, and it should be an email address that works.

This article is part of the HTML Forms Tutorial This Perl script CGI snippet does the same thing as the Java Script.

It checks to see if the required fields are there, and if not, saves an error message into a variable for display: The difference with how the CGI writes the error message is that instead of a "\n", it uses the HTML paragraph tag to put a new line in between each error.

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