All the tests were similar to this: Private Sub btn Validate String_Click( By Val sender As System.
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They make use of a pattern matching system to match the input with a certain pattern of data.
Figure 1 - These objects will determine if all our data is valid or not. Clear() 'Clear Text Box Name Valid = False 'Boolean = False Else Name Valid = True 'Everything Fine End If End Sub Easy one to start with. Focus() 'Set Focus To Text Box End If End Sub Private Sub txt Email_Lost Focus(sender As Object, e As System. Lost Focus Validate Email() 'Check Email Validity End Sub The expression may look horrible to the layman's eye, but look closer. To check if the user has entered an email that actually exists, you will have to find a different way such as to send a of some sorts.
Based on each of these variables' values, we will know if the data is correct or not. The Leave event fires when the control loses focus. As you can see, Regular Expressions are a vital tool to have at your disposal, so become good friends with them.
Most often, the purpose of data validation is to ensure correct input to a computer application.
Validation can be defined by many different methods, and deployed in many different ways.
Server side validation is performed by a web server, after input has been sent to the server.
Client side validation is performed by a web browser, before input is sent to a web server.
By Dan Mabbutt While working on a program recently, I needed to guarantee that some text input contained only numbers. Visible = False End Sub This works better and it's shorter.
(The app required the user to enter a numeric serial number.) I bingled the web for a while to see if anyone had any better ideas about how to do it than I did and I discovered (Yet again!! This article covers the common recommendations and then the one I recommend. But if you're going to do it this way, why not use the technology invented to do it: Regular Expressions.