Vba test valid email address

Here is an example of how you can test if a given email address is valid using VBA:

Function IsValidEmail(email As String) As Boolean
    Dim objRegex As Object
    Set objRegex = CreateObject("VBScript.RegExp")
    objRegex.Pattern = "^([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5})$"
    IsValidEmail = objRegex.Test(email)
End Function

This function uses a regular expression to test if the given email address matches the pattern of a valid email address. The pattern used is a common one that matches most valid email addresses, but it's not foolproof and may not match all valid email addresses.

Here's an explanation of the pattern:

• ^ matches the start of the string
• ([a-zA-Z0-9_\-\.]+) matches one or more characters that are letters (both uppercase and lowercase), numbers, underscores, hyphens, or periods
• @ matches the @ symbol
• ([a-zA-Z0-9_\-\.]+) matches one or more characters that are letters (both uppercase and lowercase), numbers, underscores, hyphens, or periods
• \. matches a period (escaped with a backslash because . has a special meaning in regular expressions)
• ([a-zA-Z]{2,5}) matches the domain extension (it must be between 2 and 5 characters long and consist only of letters)
• $ matches the end of the string

You can use this function like this:

Dim email As String
email = "[email protected]"
If IsValidEmail(email) Then
    MsgBox "The email address is valid"
Else
    MsgBox "The email address is not valid"
End If

Note that this function is case-insensitive, so it will match email addresses with uppercase or lowercase letters.

Also, keep in mind that this is not a foolproof way to validate email addresses, as there are many valid email addresses that do not match this pattern. If you need to validate email addresses for a specific purpose, you may want to use a more advanced validation method.