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Client-side validation alone does not ensure security; therefore data needs to be validated on the server-side as well.
Page 4: Use a Perl CGI script to validate your HTML forms.
This article is part of the HTML Forms Tutorial This Perl script CGI snippet does the same thing as the Java Script.
And after all, you don't want to reinvent the wheel, do you?
"But aren't there already a ton of validation plugins out there?
If you use the following script and Perl source you will know how to validate an entire form at once, displaying a series of error messages that your reader can then go back and fix.
In the head portion of your HTML, you should create a script to do the form validation: See the validation script in action.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.There are two ways to validate your forms: The basic premise of creating form validation is to look for the names of form elements that are required, and if they are empty, display an error message.These dialogs are expected to respect the settings and preferences of the user in the web browser (and operating system), such as default font-size, colors, and language.In the example below, the attribute is added to the input field. [a-z] : It matches characters from lowercase ‘a’ to lowercase ‘z’. If by mistake, user skips entering any detail, soon the alert message appear on the form.