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This means that as a programmer, you have the power to supply the exact pattern for the input you desire in any text input field. Again, certain special characters are obviously not allowed. They make use of a pattern matching system to match the input with a certain pattern of data.Sometimes people are just trying to be funny, or they are literally trying to break your program. If the data is indeed only alphabetic letters (no symbols, no numbers or any other punctuation characters) the test succeeds and stores True inside the Name Valid variable. This is because it becomes more legible than just a normal set of numbers.

If you don't know how to create a User Form, consider reading 10 steps to creating a Word userform for addressing letters before you continue.

Add the following inside your name Textbox's Leave event: Private Sub txt Name_Leave(sender As Object, e As System. Leave 'If Not A Matching Format Entered If Not Regex. If you are uncertain about the pattern I supplied, have a look here. Just a note, some surnames contain spaces and even hyphens. Sometimes there are even brackets surrounding the code.

My surname contains a space and it can get quite frustrating if I am not allowed to enter my correct surname, or that I have to edit my surname not to include a space. In certain cases the international dialling code will also need to be supplied. Compiled _ ) Dim bln Possible Match As Boolean = re Email. Text) If bln Possible Match Then 'Check If Entered Email Is In Correct Format If Not txt Email.

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.

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