The rules may be implemented through the automated facilities of a data dictionary, or by the inclusion of explicit application program validation logic.

Data validation is intended to provide certain well-defined guarantees for fitness, accuracy, and consistency for any of various kinds of user input into an application or automated system.

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Validation is important, and will ensure that your web pages are interpreted in the same way (the way you want it) by various machines, such as search engines, as well as users and visitors to your webpage.

Conforming to standards and regulations is one of the many ways you can make your website universally understood.

In simple terms, validation ensures that your website complies with the standards accepted by most web designers.

That also means that it will be accessible to more people, across more web browsers and operation systems.

This was really a lengthy process which used to put a lot of burden on the server.

Java Script provides a way to validate form's data on the client's computer before sending it to the web server. First let us see how to do a basic form validation.Data validation rules can be defined and designed using any of various methodologies, and be deployed in any of various contexts.Data validation rules may be defined, designed and deployed, for example: Definition and design contexts: Data that does not conform to these rules will negatively affect business process execution.Well, sometimes a good structured and thought out If statement can suffice, but it can become quite long and cumbersome in the future. By using Regular Expressions this way, you can reduce the chances of getting errors at erratic times. This sub checks the email's format and if it thinks that it matches, it returns True and vice versa.Also, the more tests you are performing, the slower your app might become. For more information regarding Regular Expressions, you are welcome to look at these two MSDN articles: Because it is always easy to learn by doing things practically, you will be creating an app that makes use of Regular Expressions to determine valid input. NET application and design the form to resemble Figure 1. Obviously this only works for the formatting of the email.An email address must contain at least a ‘@’ sign and a dot (.).