Binaryworld - Determine whether a string is lowercase ... [ VB.net -> String ]

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

' the string to test is in the SOURCE variable
If System.Text.RegularExpressions.Regex.IsMatch(source, "^[a-z]+$") Then
Console.WriteLine("Lowercase string")
End If

If the source string can contain accented wovel, you should modify the regular expresson pattern to account for them as well

Click here to copy the following block

If System.Text.RegularExpressions.Regex.IsMatch(source, "^[a-z]àèéìòù+$") Then
Console.WriteLine("Lowercase 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:

Click here to copy the following block

If String.Compare(source, source.ToLower) = 0 Then
Console.WriteLine("Lowercase string")
End If