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Tip of the Day
Language: VB5,VB6
Expertise: Intermediate
Sep 1, 2001

IsStringLower - Determine whether a string contains only lowercase chars

Private Declare Function IsCharLower Lib "user32" Alias "IsCharLowerA" (ByVal _
    cChar As Byte) As Boolean

' Check is the specified string is composed only by lower case characters (no 
' digits and no special chars)
' Example:
'    MsgBox "Is lower case? " & IsStringLower("hello")
'    MsgBox "Is lower case? " & IsStringLower("heLlo")
Public Function IsStringLower(ByVal sText As String) As Boolean
    Dim i As Integer
    
    IsStringLower = True
    
    ' for each char in the string
    For i = 1 To Len(sText)
        ' if not lower case, set False as return value and exit the for loop
        If IsCharLower(Asc(Mid$(sText, i, 1))) = False Then
            IsStringLower = False
            Exit For
        End If
    Next i

End Function
Marco Bellinaso
 
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