One of the questions I get asked again and again is how to validate a field value in an Acro Form with a custom validation script.
Adobe provided a lot of infrastructure to do that with just a simple script.
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Its only to help the user writing the correct address. Most times you just want to validate that the user entered the email in the right format. So I like this better than the original answer but a Septik's answer is comprehensive and I up-voted that as well.
Verimail keeps validating on keyup, which means, as soon as you start typing, you get an error message.
The following bash script contains a bash function which returns true if it is passed a valid IP address and false otherwise.
The member ‘rc’ (or return code) is used to communicate back if the validation was successful or not.
a regex alone on clientside, does not know if there is a mailserver nor if the domain itself exists.
it merly checks if the syntax of any email is valid or not.
The rules may be implemented through the automated facilities of a data dictionary, 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.
Data validation rules can be defined and designed using any of various methodologies, and be deployed in any of various contexts.