[RESOLVED] check for certain characters in a string

How can i check, in a string, so that the only a string can contain, "." and ":", and "a-z/A-Z", and "0-9" are allowed, and the strings with other characters such as !@#$%^&*(){};'"/?<>|¢£¤¥ and so on are ignored?

there might be better ways,

VB Code:

Private Function IsStringOk(strString As String) As Boolean
 
Dim i     As Integer
Dim strS  As String
 
    For i = 48 To 57 
        strS = strS & Chr$(i)
    Next i
    For i = 65 To 90 
        strS = strS & Chr$(i)
    Next i
    For i = 97 To 122 
        strS = strS & Chr$(i)
    Next i
    
    
   Debug.Print strS
    
    For i = 1 To Len(strString)
     
        If Not InStr(1, strS, Mid$(strString, i, 1)) > 0 Then
            IsStringOk = False
            Exit Function
        End If
       
    Next i
    
    IsStringOk = True
 
End Function
 
Private Sub Command1_Click()
If Not IsStringOk("abc?") Then MsgBox "notOk"
End Sub

VB Code:

Public Function RemoveInvalidChars(ByVal InputStr As String) As String
Dim i As Integer
dim sTemp As String
   
   sTemp = InputStr
   For i = 0 to 255 'or greater, i based on 255 ascii
      Select Case i
      Case 48 To 57, 65 To 90, 97 To 122
         'skip
      Case Else  'replace these characters with ""
         sTemp = Replace(sTemp, Chr(i), "", vbBinaryCompare)
      End Select
   Next
   RemoveInvalidChars = sTemp
End Function

thanks