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Tip of the Day
Language: VB7
Expertise: beginner
Sep 28, 2002

Determine whether a string is uppercase

Here's a quick-and-dirty method to determine whether a string contains only uppercase characters

' the string to test is in the SOURCE variable
If System.Text.RegularExpressions.Regex.IsMatch(source, "^[A-Z]+$") Then
    Console.WriteLine("Uppercase string")
End If
If the source string can contain accented wovel, you should modify the regular expresson pattern to account for them as well

If System.Text.RegularExpressions.Regex.IsMatch(source, _
    "^[A-ZÀÈÉÌÍÒÓÙÚ]+$") Then
    Console.WriteLine("Uppercase string")
End If
If you really want to test that the string doesn't contain any uppercase character, that is, you want to check that you already have the lowercase version of the string, you can use another approach:

If String.Compare(source, source.ToUpper) = 0 Then
    Console.WriteLine("Uppercase string")
End If
Francesco Balena
 
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